Pub Date : 2024-05-06DOI: 10.1177/1478422x241249305
N. Upadhyay, A. R. Shankar, S. Ningshen
The present investigation involved the execution of electrochemical corrosion tests on three distinct modified 9Cr–1Mo steel alloys, each characterised by varying nitrogen and boron contents. These alloys, denoted as P91 (B=0, N=330 ppm), P91B (B=100 and N=20 ppm) and P91BN (B=60 and N=110 ppm), underwent exposure to varying concentrations of NaOH (0.1, 0.2 and 0.5 M) solutions. Additionally, the study explored the influence of chloride (0.1 M NaCl) on the occurrence of pitting corrosion within an alkali environment. The results indicated that the passive current density in all the concentrations of NaOH studied is maximum for alloy P91 followed by P91B and P91BN, respectively, indicating alloy P91 is more prone to corrosion than alloy P91B and P91BN. Electrochemical impedance spectroscopy demonstrated a higher polarisation resistance value for P91BN and the lowest for P91. Scanning electron microscopy analysis revealed that in alloy P91B and P91BN, pits are formed at the M23C6 carbide/matrix interface whereas in alloy P91 apart from carbides, pits are formed at inclusions. Energy-dispersive X-ray mapping identified the elemental composition of the inclusion in P91 which is found to be complex Al2O3–MnS inclusions enriched with Mo. P91BN demonstrated better pitting corrosion resistance compared to alloys P91 and P91B when exposed to NaOH+NaCl medium.
{"title":"Effect of boron and nitrogen on the corrosion properties of modified 9Cr–1Mo steel in alkali and chloride medium","authors":"N. Upadhyay, A. R. Shankar, S. Ningshen","doi":"10.1177/1478422x241249305","DOIUrl":"https://doi.org/10.1177/1478422x241249305","url":null,"abstract":"The present investigation involved the execution of electrochemical corrosion tests on three distinct modified 9Cr–1Mo steel alloys, each characterised by varying nitrogen and boron contents. These alloys, denoted as P91 (B=0, N=330 ppm), P91B (B=100 and N=20 ppm) and P91BN (B=60 and N=110 ppm), underwent exposure to varying concentrations of NaOH (0.1, 0.2 and 0.5 M) solutions. Additionally, the study explored the influence of chloride (0.1 M NaCl) on the occurrence of pitting corrosion within an alkali environment. The results indicated that the passive current density in all the concentrations of NaOH studied is maximum for alloy P91 followed by P91B and P91BN, respectively, indicating alloy P91 is more prone to corrosion than alloy P91B and P91BN. Electrochemical impedance spectroscopy demonstrated a higher polarisation resistance value for P91BN and the lowest for P91. Scanning electron microscopy analysis revealed that in alloy P91B and P91BN, pits are formed at the M23C6 carbide/matrix interface whereas in alloy P91 apart from carbides, pits are formed at inclusions. Energy-dispersive X-ray mapping identified the elemental composition of the inclusion in P91 which is found to be complex Al2O3–MnS inclusions enriched with Mo. P91BN demonstrated better pitting corrosion resistance compared to alloys P91 and P91B when exposed to NaOH+NaCl medium.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":"360 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141006682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-05-02DOI: 10.1177/1478422x241249306
D. G. Ramlan, Nor Aszreeyn Norizan, Nur Alin Zainab Zulfaisal, N. Othman, N. Yaakob
Wet gas pipelines transport unprocessed natural gas that contains water and carbon dioxide (CO2), which combination can lead to severe wall loss caused by CO2 or sweet corrosion in carbon steel. Under specific conditions, CO2 corrosion occurs at the top section of the pipeline, which is known as top-of-the-line corrosion (TLC). TLC tests were conducted in the water-hydrocarbon co-condensation environment using 10 vol% n-heptane and 25 vol% n-heptane to simulate the internal condition of a wet gas pipeline to study the effect of hydrocarbon volume ratio towards TLC. The presence of n-heptane showed minimal effect on the gas temperature profile; however, n-heptane suppressed the water condensation, resulting in a tremendous decrease in the water condensation rate (WCR). The TLC rates were found to be lower in the presence of n-heptane, which can be attributed to the reduced WCR and water-wetted areas. The presence of n-heptane had no significant effect on the pitting rates but showed an increasing pit ratio as the n-heptane volume increased. TLC tests were conducted at three durations: one day, two days and three days showing that n-heptane has no significant effect on corrosion kinetics.
{"title":"Effect of hydrocarbon volume ratio in sweet top-of-the-line corrosion under water-hydrocarbon co-condensation","authors":"D. G. Ramlan, Nor Aszreeyn Norizan, Nur Alin Zainab Zulfaisal, N. Othman, N. Yaakob","doi":"10.1177/1478422x241249306","DOIUrl":"https://doi.org/10.1177/1478422x241249306","url":null,"abstract":"Wet gas pipelines transport unprocessed natural gas that contains water and carbon dioxide (CO2), which combination can lead to severe wall loss caused by CO2 or sweet corrosion in carbon steel. Under specific conditions, CO2 corrosion occurs at the top section of the pipeline, which is known as top-of-the-line corrosion (TLC). TLC tests were conducted in the water-hydrocarbon co-condensation environment using 10 vol% n-heptane and 25 vol% n-heptane to simulate the internal condition of a wet gas pipeline to study the effect of hydrocarbon volume ratio towards TLC. The presence of n-heptane showed minimal effect on the gas temperature profile; however, n-heptane suppressed the water condensation, resulting in a tremendous decrease in the water condensation rate (WCR). The TLC rates were found to be lower in the presence of n-heptane, which can be attributed to the reduced WCR and water-wetted areas. The presence of n-heptane had no significant effect on the pitting rates but showed an increasing pit ratio as the n-heptane volume increased. TLC tests were conducted at three durations: one day, two days and three days showing that n-heptane has no significant effect on corrosion kinetics.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":"35 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141022774","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this study, Ce3+ functionalised halloysite nanotubes (HNTs) were prepared, and their impact on the anticorrosion properties of waterborne polyurethane (WPU) coating on 7075 aluminium alloy (AA7075) was investigated. HNTs were grafted by 3-aminopropyltriethoxysilane (APTES) to enhance Ce3+ loading, which was confirmed by X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectrum. The release behaviour of Ce3+ from HNTs was tested by inductively coupled plasma optical emission spectrometry (ICP-OES), and the inhibition effect of Ce3+-loaded HNTs for AA7075 was tested by polarization plots. The anticorrosion property of WPU doped with Ce3+-loaded HNTs was investigated by electrochemical impedance spectroscopy (EIS) and pull-off adhesion test. The results showed that APTES modification improved the Ce3+ loading amount on HNTs, and Ce3+ acts as an effective cathodic inhibitor for AA7075. After soaking for 40 days, the |Z|0.01Hz of Ce-HNTs/WPU was two orders of magnitude higher than that of pure WPU, while wet put-off adhesion was higher than pure WPU.
{"title":"A new strategy to improve the anticorrosion performance of waterborne polyurethane coating on AA7075","authors":"Bing Lei, Jingjing Li, Ling Liu, Longjiang Lian, Simin Chen, Shanlin Zhang, Zhi-ming Feng, Guozhe Meng","doi":"10.1177/1478422x241247943","DOIUrl":"https://doi.org/10.1177/1478422x241247943","url":null,"abstract":"In this study, Ce3+ functionalised halloysite nanotubes (HNTs) were prepared, and their impact on the anticorrosion properties of waterborne polyurethane (WPU) coating on 7075 aluminium alloy (AA7075) was investigated. HNTs were grafted by 3-aminopropyltriethoxysilane (APTES) to enhance Ce3+ loading, which was confirmed by X-ray diffraction (XRD) and Fourier-transform infrared (FT-IR) spectrum. The release behaviour of Ce3+ from HNTs was tested by inductively coupled plasma optical emission spectrometry (ICP-OES), and the inhibition effect of Ce3+-loaded HNTs for AA7075 was tested by polarization plots. The anticorrosion property of WPU doped with Ce3+-loaded HNTs was investigated by electrochemical impedance spectroscopy (EIS) and pull-off adhesion test. The results showed that APTES modification improved the Ce3+ loading amount on HNTs, and Ce3+ acts as an effective cathodic inhibitor for AA7075. After soaking for 40 days, the |Z|0.01Hz of Ce-HNTs/WPU was two orders of magnitude higher than that of pure WPU, while wet put-off adhesion was higher than pure WPU.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":"56 12","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140662267","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-17DOI: 10.1177/1478422x241246611
Shuangshuang Zhang, Xinyu Du, Wei Shi, Song Xiang
The tribocorrosion of titanium implants is the primary cause of their late failure. As the most promising third-generation medical β-type titanium alloy, Ti-13Nb-13Zr (TC26) demonstrates superior corrosion resistance and harmless chemical element composition, making it an excellent alternative to Ti-6Al-4V alloy (TC4). Nonetheless, this study has revealed a significant weakness of TC26 in tribocorrosion properties under low dissolved oxygen concentration conditions, which could pose potential hazards in subsequent medical applications. The effects of low dissolved oxygen concentration on the tribocorrosion properties and ion release were examined using electrochemical methods, laser confocal microscopy, scanning electron microscopy, and inductively coupled plasma emission spectrometer. The findings indicate that TC26 exhibits significantly inferior corrosion resistance compared to TC4 due to the sluggish recovery rate of the passivation film under low dissolved oxygen concentration conditions during wear. Moreover, TC26 experiences greater mechanical wear loss than that of TC4. However, under the synergistic effect of wear and corrosion, TC26 releases a minimal amount of ions, while excessive harmful Al ions are released by TC4.
{"title":"Effect of low dissolved oxygen concentration on the tribocorrosion properties and ion release of Ti-13Nb-13Zr","authors":"Shuangshuang Zhang, Xinyu Du, Wei Shi, Song Xiang","doi":"10.1177/1478422x241246611","DOIUrl":"https://doi.org/10.1177/1478422x241246611","url":null,"abstract":"The tribocorrosion of titanium implants is the primary cause of their late failure. As the most promising third-generation medical β-type titanium alloy, Ti-13Nb-13Zr (TC26) demonstrates superior corrosion resistance and harmless chemical element composition, making it an excellent alternative to Ti-6Al-4V alloy (TC4). Nonetheless, this study has revealed a significant weakness of TC26 in tribocorrosion properties under low dissolved oxygen concentration conditions, which could pose potential hazards in subsequent medical applications. The effects of low dissolved oxygen concentration on the tribocorrosion properties and ion release were examined using electrochemical methods, laser confocal microscopy, scanning electron microscopy, and inductively coupled plasma emission spectrometer. The findings indicate that TC26 exhibits significantly inferior corrosion resistance compared to TC4 due to the sluggish recovery rate of the passivation film under low dissolved oxygen concentration conditions during wear. Moreover, TC26 experiences greater mechanical wear loss than that of TC4. However, under the synergistic effect of wear and corrosion, TC26 releases a minimal amount of ions, while excessive harmful Al ions are released by TC4.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":" 26","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140692841","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-09DOI: 10.1177/1478422x241246677
M. Khoma, VA Vynar, Marian Chuchman, ChB Vasyliv, V. Ivashkiv, SA Halaichak
The effect of hydrogen sulphide concentration on the corrosion behaviour of 07Cr16Ni6 austenitic-martensitic stainless steel in a 5% NaCl + 0.5% CH3COOH solution was studied to determine the role of H2S in the corrosion product formation and corrosion mechanism. Unstable passivation of steel is detected in a solution containing <100 mg/dm3 H2S. Steel corrodes in an electrochemically active state at >100 mg/dm3 H2S. When the pitting potential is reached, pitting damage occurs at the grain boundaries. The corrosion rate decreases by ∼five times after exposition for 720 h due to the formation of nickel and iron sulphides on the surface. Corrosion is accompanied by the absorption of 4.2–17.5 ppm hydrogen, 62…70% of which is diffusible and can cause hydrogen embrittlement. The scheme of steel corrosion under the influence of different concentrations of hydrogen sulphide is proposed.
{"title":"Influence of hydrogen sulphide on the corrosion and hydrogenation of 07Cr16Ni6 steel","authors":"M. Khoma, VA Vynar, Marian Chuchman, ChB Vasyliv, V. Ivashkiv, SA Halaichak","doi":"10.1177/1478422x241246677","DOIUrl":"https://doi.org/10.1177/1478422x241246677","url":null,"abstract":"The effect of hydrogen sulphide concentration on the corrosion behaviour of 07Cr16Ni6 austenitic-martensitic stainless steel in a 5% NaCl + 0.5% CH3COOH solution was studied to determine the role of H2S in the corrosion product formation and corrosion mechanism. Unstable passivation of steel is detected in a solution containing <100 mg/dm3 H2S. Steel corrodes in an electrochemically active state at >100 mg/dm3 H2S. When the pitting potential is reached, pitting damage occurs at the grain boundaries. The corrosion rate decreases by ∼five times after exposition for 720 h due to the formation of nickel and iron sulphides on the surface. Corrosion is accompanied by the absorption of 4.2–17.5 ppm hydrogen, 62…70% of which is diffusible and can cause hydrogen embrittlement. The scheme of steel corrosion under the influence of different concentrations of hydrogen sulphide is proposed.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":"20 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140720741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-04-08DOI: 10.1177/1478422x241242575
Kaibin Hao, W. Xia, Qiang Li, Hongge Yan, Jihua Chen, B. Su
Microalloying is an effective method to improve the properties of Al–Mg alloys. The microstructure, mechanical properties and corrosion behaviours of Al–9.2Mg–0.8Mn– xCu ( x = 0–1.2 wt-%) alloys are studied to promote the application of Al–Mg alloys. The addition of Cu increases the strength of the alloy, where the ultimate tensile strength of 0.6 wt-% Cu alloy is improved by 43 MPa. Moreover, the addition of Cu significantly affects the corrosion behaviours of alloys. For as-sensitised alloys, compared to the matrix, the 0.1 wt-% Cu alloy shows a 28.3% reduction in pitting corrosion mass loss, which is attributed to the Cu element can form a stable passivation film, and the 0.3 wt-% Cu alloy shows a 15% reduction in intergranular corrosion mass loss, which is attributed to the addition of Cu can restrict the β phase precipitation at grain boundaries. The study shows that Cu-alloying can improve the comprehensive properties of Al–9.2Mg–0.8Mn alloys.
{"title":"Effect of Cu addition on the mechanical properties and corrosion behaviours of Al–9.2Mg–0.8Mn alloy","authors":"Kaibin Hao, W. Xia, Qiang Li, Hongge Yan, Jihua Chen, B. Su","doi":"10.1177/1478422x241242575","DOIUrl":"https://doi.org/10.1177/1478422x241242575","url":null,"abstract":"Microalloying is an effective method to improve the properties of Al–Mg alloys. The microstructure, mechanical properties and corrosion behaviours of Al–9.2Mg–0.8Mn– xCu ( x = 0–1.2 wt-%) alloys are studied to promote the application of Al–Mg alloys. The addition of Cu increases the strength of the alloy, where the ultimate tensile strength of 0.6 wt-% Cu alloy is improved by 43 MPa. Moreover, the addition of Cu significantly affects the corrosion behaviours of alloys. For as-sensitised alloys, compared to the matrix, the 0.1 wt-% Cu alloy shows a 28.3% reduction in pitting corrosion mass loss, which is attributed to the Cu element can form a stable passivation film, and the 0.3 wt-% Cu alloy shows a 15% reduction in intergranular corrosion mass loss, which is attributed to the addition of Cu can restrict the β phase precipitation at grain boundaries. The study shows that Cu-alloying can improve the comprehensive properties of Al–9.2Mg–0.8Mn alloys.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":"78 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140729228","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-27DOI: 10.1177/1478422x241241389
Mohammad F. Tamimi, Ammar A. Alshannaq, Mu’ath I. AbuQamar
The randomness of atmospheric conditions is among the key contributing factors that affect the ability to accurately predict the corrosion growth in steel structures. Climate change has the potential to alter the long-term characteristics of these factors over the lifespan of steel structures, both those already existing and those newly built. The impact of climate variability on the stochastic nature of atmospheric variables, which greatly influence corrosion conditions, can add complexity to corrosion predictions in these structures. This paper introduces an integrated framework to quantify the impact of climate change on corrosion rates of steel structures worldwide. It considers the changes in environmental conditions, specifically temperature, relative humidity and wind speed and their effects on atmospheric corrosion. Global Climate Models are employed to evaluate the long-term impacts of climate change on these environmental conditions. An analytical model for predicting corrosion rate is integrated with climate change models to predict alterations in the corrosion rates of steel components relative to historical conditions. This paper also discusses the impact of climate change on the variations of these climatic parameters and offers a comparison between historical data and projected conditions across the globe. The results indicate that the effect of climate change on the corrosion rate depends on the considered region. While regions such as Australia, North America and Europe see an increase, others such as Asia and Africa observe a decline. Notably, all oceans, especially the Antarctic and Arctic, experience a significant increase in corrosion by the end of the century.
{"title":"Deterioration of steel structures due to corrosion considering the global effects of climate change","authors":"Mohammad F. Tamimi, Ammar A. Alshannaq, Mu’ath I. AbuQamar","doi":"10.1177/1478422x241241389","DOIUrl":"https://doi.org/10.1177/1478422x241241389","url":null,"abstract":"The randomness of atmospheric conditions is among the key contributing factors that affect the ability to accurately predict the corrosion growth in steel structures. Climate change has the potential to alter the long-term characteristics of these factors over the lifespan of steel structures, both those already existing and those newly built. The impact of climate variability on the stochastic nature of atmospheric variables, which greatly influence corrosion conditions, can add complexity to corrosion predictions in these structures. This paper introduces an integrated framework to quantify the impact of climate change on corrosion rates of steel structures worldwide. It considers the changes in environmental conditions, specifically temperature, relative humidity and wind speed and their effects on atmospheric corrosion. Global Climate Models are employed to evaluate the long-term impacts of climate change on these environmental conditions. An analytical model for predicting corrosion rate is integrated with climate change models to predict alterations in the corrosion rates of steel components relative to historical conditions. This paper also discusses the impact of climate change on the variations of these climatic parameters and offers a comparison between historical data and projected conditions across the globe. The results indicate that the effect of climate change on the corrosion rate depends on the considered region. While regions such as Australia, North America and Europe see an increase, others such as Asia and Africa observe a decline. Notably, all oceans, especially the Antarctic and Arctic, experience a significant increase in corrosion by the end of the century.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":"44 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140373568","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-24DOI: 10.1177/1478422x241241390
Mahmoud A. Al-Qudah, Faisal K. Algethami, Omaima A. Fodeh, I. Al-Momani, Tareq T. Bataineh, Abbas I. Alakhras, G. Al-Mazaideh
The inhibitory impact of the methanolic Ajuga orientalis (MAO) extract on Al corrosion in 1.0 M NaOH solution was examined using weight loss with electrochemical polarisation and scanning electron microscopy (SEM) techniques. According to the findings, the extract was an effective inhibitor in basic condition, as well as inhibition effectiveness increased with concentration. Furthermore, temperature studies revealed a loss in efficiency followed by a rise when temperature rose, followed by an increase and a fall in the fundamental media when the temperature increased from 30 °C to 50 °C. Frumkin, Freundlich and El Awady isotherms were used to mimic the inhibitor's adsorption properties. For the inhibitory behaviour, physical and chemical adsorption mechanisms are proposed. The adsorption process's thermodynamic parameters (ΔH*, ΔS* and Ea) were determined and explained. The inhibitor was examined as a mixed-type (anodic and cathodic) inhibitor based on polarisation studies. The inhibitor, according to the SEM data, is partially coating the metal surface, providing it with a reasonable amount of protection. The findings from weight loss, electrochemical polarisation, SEM and quantum chemical calculations collectively demonstrate a strong consensus, indicating that the MAO extract exhibits high effectiveness as an inhibitor for aluminium in a basic solution.
采用电化学极化失重法和扫描电子显微镜（SEM）技术，研究了甲醇Ajuga orientalis（MAO）提取物对1.0 M NaOH溶液中铝腐蚀的抑制作用。研究结果表明，该提取物在碱性条件下是一种有效的抑制剂，而且抑制效果随浓度的增加而提高。此外，温度研究表明，当温度升高时，效率先下降后上升，当温度从 30 °C 升至 50 °C 时，基本介质的效率先上升后下降。Frumkin 等温线、Freundlich 等温线和 El Awady 等温线被用来模拟抑制剂的吸附特性。对于抑制行为，提出了物理和化学吸附机制。确定并解释了吸附过程的热力学参数（ΔH*、ΔS* 和 Ea）。根据极化研究，该抑制剂是一种混合型（阳极和阴极）抑制剂。根据扫描电镜数据，抑制剂部分包覆了金属表面，为其提供了合理的保护。从失重、电化学极化、扫描电镜和量子化学计算得出的结论共同表明，MAO 提取物在碱性溶液中作为铝抑制剂具有很高的有效性。
{"title":"Eco-friendly methanolic Ajuga orientalis extract as corrosion inhibitor for aluminium in 1.0 M NaOH","authors":"Mahmoud A. Al-Qudah, Faisal K. Algethami, Omaima A. Fodeh, I. Al-Momani, Tareq T. Bataineh, Abbas I. Alakhras, G. Al-Mazaideh","doi":"10.1177/1478422x241241390","DOIUrl":"https://doi.org/10.1177/1478422x241241390","url":null,"abstract":"The inhibitory impact of the methanolic Ajuga orientalis (MAO) extract on Al corrosion in 1.0 M NaOH solution was examined using weight loss with electrochemical polarisation and scanning electron microscopy (SEM) techniques. According to the findings, the extract was an effective inhibitor in basic condition, as well as inhibition effectiveness increased with concentration. Furthermore, temperature studies revealed a loss in efficiency followed by a rise when temperature rose, followed by an increase and a fall in the fundamental media when the temperature increased from 30 °C to 50 °C. Frumkin, Freundlich and El Awady isotherms were used to mimic the inhibitor's adsorption properties. For the inhibitory behaviour, physical and chemical adsorption mechanisms are proposed. The adsorption process's thermodynamic parameters (ΔH*, ΔS* and Ea) were determined and explained. The inhibitor was examined as a mixed-type (anodic and cathodic) inhibitor based on polarisation studies. The inhibitor, according to the SEM data, is partially coating the metal surface, providing it with a reasonable amount of protection. The findings from weight loss, electrochemical polarisation, SEM and quantum chemical calculations collectively demonstrate a strong consensus, indicating that the MAO extract exhibits high effectiveness as an inhibitor for aluminium in a basic solution.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":" 28","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140386186","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-21DOI: 10.1177/1478422x241240369
C. Vinoth Kumar, G. Rajyalakshmi
This study examines the effects of a hydroxyapatite/anatase TiO2/CeO2 coating on the corrosion of AZ31B magnesium alloy in a simulated body fluid. Plasma electrolytic oxidation (PEO) is used to create the coating, and the surface properties are analysed using X-ray diffraction (XRD), atomic force microscopy (AFM) and field-emission scanning electron microscopy (FE-SEM). Contact angle measurements adapted to compare the uncoated substrate (144.74 ± 2.08°) with the coated substrates, which exhibit contact angles of (107.92 ± 2.16°), (95.88 ± 2.06°) and (66.05 ± 2.09°) for the respective coating durations. Increasing the thickness of the coating improves its corrosion resistance. Specifically, a 6-minute PEO coating significantly increases the thickness and provides better protection against corrosion for the AZ31B magnesium alloy. Cross-sectional scans of the coated samples revealed an increase in specimen thickness from 32.92 μm to77.17 μm. Potentiodynamic polarisation tests in a simulated body fluid reveal that the 6-minute coated sample shows the highest corrosion resistance, with the lowest corrosion current density (1.9037 × 10-06) compared to other coatings, indicating strong protection against corrosion. This research proposes a novel method to enhance the corrosion resistance of PEO coatings on magnesium alloys by depositing a thicker layer of hydroxyapatite, anatase TiO2 and CeO2. This approach results in a stronger and more effective protective system against corrosion.
{"title":"Corrosion resistance of hybrid plasma electrolytic oxidation coatings on AZ31B magnesium alloy in simulated body fluid","authors":"C. Vinoth Kumar, G. Rajyalakshmi","doi":"10.1177/1478422x241240369","DOIUrl":"https://doi.org/10.1177/1478422x241240369","url":null,"abstract":"This study examines the effects of a hydroxyapatite/anatase TiO2/CeO2 coating on the corrosion of AZ31B magnesium alloy in a simulated body fluid. Plasma electrolytic oxidation (PEO) is used to create the coating, and the surface properties are analysed using X-ray diffraction (XRD), atomic force microscopy (AFM) and field-emission scanning electron microscopy (FE-SEM). Contact angle measurements adapted to compare the uncoated substrate (144.74 ± 2.08°) with the coated substrates, which exhibit contact angles of (107.92 ± 2.16°), (95.88 ± 2.06°) and (66.05 ± 2.09°) for the respective coating durations. Increasing the thickness of the coating improves its corrosion resistance. Specifically, a 6-minute PEO coating significantly increases the thickness and provides better protection against corrosion for the AZ31B magnesium alloy. Cross-sectional scans of the coated samples revealed an increase in specimen thickness from 32.92 μm to77.17 μm. Potentiodynamic polarisation tests in a simulated body fluid reveal that the 6-minute coated sample shows the highest corrosion resistance, with the lowest corrosion current density (1.9037 × 10-06) compared to other coatings, indicating strong protection against corrosion. This research proposes a novel method to enhance the corrosion resistance of PEO coatings on magnesium alloys by depositing a thicker layer of hydroxyapatite, anatase TiO2 and CeO2. This approach results in a stronger and more effective protective system against corrosion.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":"12 s1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140222173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-03-18DOI: 10.1177/1478422x241239191
Fereshteh Adel-Mehraban, Roya Saeidi, Mohsen Moradmand, Mohammad Zhiani, K. Raeissi
This study evaluated the corrosion performance of carbon steel (CS) and 304 stainless steel (304 SS) under high temperature and pressure (inside an autoclave) in a CO2-saturated solution of activated methyldiethanolamine (aMDEA). The aim was to determine the effect of temperature, presence of chloride ions, degradation of the aMDEA and amount of dissolved oxygen on the corrosion resistance of these materials. The results indicated that raising the temperature between 50 and 120°C led to a higher corrosion rate of both CS and 304 SS. However, the corrosion rate of 304 SS decreased and remained stable at higher temperatures as the corrosion reaction became mass-controlled. Oxygen loading results in the passivation of both CS and 304 SS. The amine degradation products were found to accelerate the corrosion rate of CS at 50°C due to a chelation effect of iron ions, and also increase the corrosion rate of 304 SS at 120°C by causing the passive film rupture. The SCC test on U-shaped 304 SS samples showed transversal microcracks with a depth of more than 25 µm after 2 months of immersion in an autoclave containing CO2-saturated aMDEA at 120°C, which confirmed the SCC risk of 304 SS.
本研究评估了碳钢（CS）和 304 不锈钢（304 SS）在活性甲基二乙醇胺（aMDEA）的二氧化碳饱和溶液中的高温高压（高压釜内）腐蚀性能。目的是确定温度、氯离子的存在、aMDEA 的降解和溶氧量对这些材料耐腐蚀性的影响。结果表明，在 50 至 120°C 之间升温会导致 CS 和 304 SS 的腐蚀率升高。然而，随着腐蚀反应变得质量可控，304 SS 的腐蚀速率降低，并在较高温度下保持稳定。氧气负载会导致 CS 和 304 SS 的钝化。研究发现，由于铁离子的螯合作用，胺降解产物在 50°C 时会加快 CS 的腐蚀速度，并在 120°C 时通过导致被动膜破裂而提高 304 SS 的腐蚀速度。对 U 形 304 SS 样品进行的 SCC 测试表明，在 120°C 下含有二氧化碳饱和 aMDEA 的高压釜中浸泡 2 个月后，出现了深度超过 25 µm 的横向微裂纹，这证实了 304 SS 的 SCC 风险。
{"title":"Corrosion performance of carbon steel and 304 stainless steel in activated methyldiethanolamine solution using autoclave tests","authors":"Fereshteh Adel-Mehraban, Roya Saeidi, Mohsen Moradmand, Mohammad Zhiani, K. Raeissi","doi":"10.1177/1478422x241239191","DOIUrl":"https://doi.org/10.1177/1478422x241239191","url":null,"abstract":"This study evaluated the corrosion performance of carbon steel (CS) and 304 stainless steel (304 SS) under high temperature and pressure (inside an autoclave) in a CO2-saturated solution of activated methyldiethanolamine (aMDEA). The aim was to determine the effect of temperature, presence of chloride ions, degradation of the aMDEA and amount of dissolved oxygen on the corrosion resistance of these materials. The results indicated that raising the temperature between 50 and 120°C led to a higher corrosion rate of both CS and 304 SS. However, the corrosion rate of 304 SS decreased and remained stable at higher temperatures as the corrosion reaction became mass-controlled. Oxygen loading results in the passivation of both CS and 304 SS. The amine degradation products were found to accelerate the corrosion rate of CS at 50°C due to a chelation effect of iron ions, and also increase the corrosion rate of 304 SS at 120°C by causing the passive film rupture. The SCC test on U-shaped 304 SS samples showed transversal microcracks with a depth of more than 25 µm after 2 months of immersion in an autoclave containing CO2-saturated aMDEA at 120°C, which confirmed the SCC risk of 304 SS.","PeriodicalId":517061,"journal":{"name":"Corrosion Engineering, Science and Technology: The International Journal of Corrosion Processes and Corrosion Control","volume":"258 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-03-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140233411","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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