Pub Date : 2022-10-11DOI: 10.1080/1478422X.2022.2130509
J. Kou, Dongxing Ma, L. Yang, De-hua Wang
ABSTRACT With the widespread application of CO2-Enhanced Oilfield Recovery (CO2-EOR) technology, CO2 in large quantities enters oil and gas gathering pipelines and causes severe corrosion. As a result, this paper investigates the corrosion behaviour of 20# steel in produced water and 40% water content emulsion with different CO2 contents by combining Wire Beam Electrode (WBE) technology and the corrosion weight loss method, and establishes a corrosion mechanism model for analysis and explanation. The results demonstrate that variations in CO2 concentration have a greater impact on the corrosion process in the produced water simulated fluid, and there is considerable corrosion non-uniformity in the CO2 saturated state, as well as polarity reversal throughout the whole corrosion process. On the contrary, corrosion in the emulsion is more stable and uniform because the crude oil in the emulsion obstructs the mass transfer process of the depolariser agent and forms a ‘surface wetting’ effect on the metal surface, which seriously hinders the corrosion process.
{"title":"Effect of CO2 content on corrosion non-uniformity of 20# steel in oil–water two-phase based on wire beam electrode technique","authors":"J. Kou, Dongxing Ma, L. Yang, De-hua Wang","doi":"10.1080/1478422X.2022.2130509","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2130509","url":null,"abstract":"ABSTRACT With the widespread application of CO2-Enhanced Oilfield Recovery (CO2-EOR) technology, CO2 in large quantities enters oil and gas gathering pipelines and causes severe corrosion. As a result, this paper investigates the corrosion behaviour of 20# steel in produced water and 40% water content emulsion with different CO2 contents by combining Wire Beam Electrode (WBE) technology and the corrosion weight loss method, and establishes a corrosion mechanism model for analysis and explanation. The results demonstrate that variations in CO2 concentration have a greater impact on the corrosion process in the produced water simulated fluid, and there is considerable corrosion non-uniformity in the CO2 saturated state, as well as polarity reversal throughout the whole corrosion process. On the contrary, corrosion in the emulsion is more stable and uniform because the crude oil in the emulsion obstructs the mass transfer process of the depolariser agent and forms a ‘surface wetting’ effect on the metal surface, which seriously hinders the corrosion process.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"58 1","pages":"23 - 35"},"PeriodicalIF":1.8,"publicationDate":"2022-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45236780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-10-06DOI: 10.1080/1478422X.2022.2128376
Marcelo T. G. de Sampaio, Anderson B. Furtado, M. Ignácio, S. Tavares, J. Pardal, A. Pimenta, E. Ponzio
ABSTRACT An optimised electrochemical technique, linear sweep voltammetry (LSV) in KOH solution (LSV-KOH) was confronted with the double loop electrochemical Potentiokinetic reactivation (DL-EPR) to verify which is the best technique to quantify deleterious phases (DP) in a UNS S32750 super duplex stainless steel. DL-EPR presented an error in determination of deleterious phases in the range of 6.9–100%. LSV-KOH show a better accuracy in quantification of deleterious phases volume fractions, the error range for LSV-KOH was 2.4–26.2%. When the morphology of sigma changes from lamellar to divorced, was observed modifications on LSV-KOH voltammograms. In specimens where lamellar morphology is present, the voltammograms show two peaks curve. Meanwhile, in specimens where occurred also divorced precipitation of sigma the voltammograms changes to a 3 peaks curve. This feature is due to the dissolution of sigma phase boundaries which has different compositions according to the form of sigma precipitation.
{"title":"DL-EPR vs. LSV-KOH: from simple detection of deleterious phases to analysis of morphology and high accuracy on determination of sigma phase in UNS S32750 stainless steel","authors":"Marcelo T. G. de Sampaio, Anderson B. Furtado, M. Ignácio, S. Tavares, J. Pardal, A. Pimenta, E. Ponzio","doi":"10.1080/1478422X.2022.2128376","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2128376","url":null,"abstract":"ABSTRACT An optimised electrochemical technique, linear sweep voltammetry (LSV) in KOH solution (LSV-KOH) was confronted with the double loop electrochemical Potentiokinetic reactivation (DL-EPR) to verify which is the best technique to quantify deleterious phases (DP) in a UNS S32750 super duplex stainless steel. DL-EPR presented an error in determination of deleterious phases in the range of 6.9–100%. LSV-KOH show a better accuracy in quantification of deleterious phases volume fractions, the error range for LSV-KOH was 2.4–26.2%. When the morphology of sigma changes from lamellar to divorced, was observed modifications on LSV-KOH voltammograms. In specimens where lamellar morphology is present, the voltammograms show two peaks curve. Meanwhile, in specimens where occurred also divorced precipitation of sigma the voltammograms changes to a 3 peaks curve. This feature is due to the dissolution of sigma phase boundaries which has different compositions according to the form of sigma precipitation.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"58 1","pages":"1 - 11"},"PeriodicalIF":1.8,"publicationDate":"2022-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42127127","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
ABSTRACT In this work, the influence of sand impingements on cathodic protection (CP) of marine carbon steel in natural sea water was studied in comparison with the CP performances in static and flowing sea water without sand particles. Results show that the propagation of local active anodic dissolution at the steel inclusions could be totally inhibited by providing sufficient cathodic current in the sea water free of sand particles. However, the local ‘CP shielding’, potential fluctuation and sand impingements would enhance the anodic dissolution at inclusions, thus leading to the occurrence of erosion-corrosion under CP. The negative shift of the CP potential could not retard the propagation of erosion-corrosion pits under sand impingements. The synergy of erosion and corrosion might result in long-term failure of local CP.
{"title":"Sand impingements on cathodic protection of marine carbon steel in natural sea water","authors":"Shan Gao, Xiaohui Zou, Yubin Zhao, Hao Chen, Qiliang Zhang, Yi Huang, Yunze Xu","doi":"10.1080/1478422X.2022.2128708","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2128708","url":null,"abstract":"ABSTRACT In this work, the influence of sand impingements on cathodic protection (CP) of marine carbon steel in natural sea water was studied in comparison with the CP performances in static and flowing sea water without sand particles. Results show that the propagation of local active anodic dissolution at the steel inclusions could be totally inhibited by providing sufficient cathodic current in the sea water free of sand particles. However, the local ‘CP shielding’, potential fluctuation and sand impingements would enhance the anodic dissolution at inclusions, thus leading to the occurrence of erosion-corrosion under CP. The negative shift of the CP potential could not retard the propagation of erosion-corrosion pits under sand impingements. The synergy of erosion and corrosion might result in long-term failure of local CP.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"58 1","pages":"12 - 22"},"PeriodicalIF":1.8,"publicationDate":"2022-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46875020","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-30DOI: 10.1080/1478422X.2022.2127637
D. Wan, Yu Wang, Shaoyun Dong, Y. Xue, G. Han, Fan Yang, Hao Tang, Jie Kang, Guanmei Zeng, Junwen Xu
ABSTRACT High-strength Mg-Zn-Y alloy with a long-period stacking ordered (LPSO) phase was chosen as the base alloy, and different Ca were added to it. The phase component and microstructure of the alloys were examined using diffraction of X-rays (XRD) and scanning electron microscopy (SEM). A new phase, Ca2Mg6Zn3, was found to be formed by the addition of Ca. The hydrogen evolution corrosion method and an electrochemical test showed that the amount of hydrogen evolution without Ca addition was twice that with Ca addition. The corrosion resistance of the magnesium alloy improved when the amount of Ca added was. In order to understand the dynamic corrosion process, we soaked Mg97Zn1Y2-X wt-% Ca (X = 0, 0.1, 0.3, 0.6, 1) alloy in 3.5 wt-% NaCl solution for 2, 6, 12 h. It was observed that with an increase in the Ca content, the degree of corrosion of the alloy gradually decreased, and the amount of granular corrosion products covering the alloy’s surface also decreased.
{"title":"Improving corrosion resistance of high strength Mg-Zn-Y alloy through Ca addition","authors":"D. Wan, Yu Wang, Shaoyun Dong, Y. Xue, G. Han, Fan Yang, Hao Tang, Jie Kang, Guanmei Zeng, Junwen Xu","doi":"10.1080/1478422X.2022.2127637","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2127637","url":null,"abstract":"ABSTRACT High-strength Mg-Zn-Y alloy with a long-period stacking ordered (LPSO) phase was chosen as the base alloy, and different Ca were added to it. The phase component and microstructure of the alloys were examined using diffraction of X-rays (XRD) and scanning electron microscopy (SEM). A new phase, Ca2Mg6Zn3, was found to be formed by the addition of Ca. The hydrogen evolution corrosion method and an electrochemical test showed that the amount of hydrogen evolution without Ca addition was twice that with Ca addition. The corrosion resistance of the magnesium alloy improved when the amount of Ca added was. In order to understand the dynamic corrosion process, we soaked Mg97Zn1Y2-X wt-% Ca (X = 0, 0.1, 0.3, 0.6, 1) alloy in 3.5 wt-% NaCl solution for 2, 6, 12 h. It was observed that with an increase in the Ca content, the degree of corrosion of the alloy gradually decreased, and the amount of granular corrosion products covering the alloy’s surface also decreased.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"789 - 795"},"PeriodicalIF":1.8,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48546392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-30DOI: 10.1080/1478422X.2022.2118438
H. Yushu, Shen Qiaosheng, Zhang Henghua
ABSTRACT In this study, the mechanical and biocorrosion behavior of as-cast Zn-xCu-0.1Sr (x = 1, 2, and 3wt%) alloys for potential application was studied. The microstructure, mechanical properties, and in vitro degradation of Zn-xCu-0.1Sr alloys were investigated. The results show that as Cu content increased from 1.0 to 3.0wt%, the number of CuZn5 phases increased and the average grain size of CuZn5 phases increased from 6.96 μm to 10.92 μm. The 2wt% addition of Cu resulted in the best mechanical properties with 129.4 MPa in ultimate tensile strength and 108.4 MPa in yield strength. Furthermore, the higher corrosion rate was experienced in the alloys with higher Cu content after immersion. Zn-xCu-0.1Sr alloys all presented appropriate in vitro degradation rates in a basically uniform degradation mode. The strength, ductility and biocorrosion property exhibited by the Zn-2Cu-0.1Sr alloy compositions make it a promising candidate for cardiovascular stent applications.
{"title":"Mechanical properties and biocorrosion behaviour of as-cast Zn-xCu-Sr alloys for cardiovascular bioabsorbable devices","authors":"H. Yushu, Shen Qiaosheng, Zhang Henghua","doi":"10.1080/1478422X.2022.2118438","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2118438","url":null,"abstract":"ABSTRACT In this study, the mechanical and biocorrosion behavior of as-cast Zn-xCu-0.1Sr (x = 1, 2, and 3wt%) alloys for potential application was studied. The microstructure, mechanical properties, and in vitro degradation of Zn-xCu-0.1Sr alloys were investigated. The results show that as Cu content increased from 1.0 to 3.0wt%, the number of CuZn5 phases increased and the average grain size of CuZn5 phases increased from 6.96 μm to 10.92 μm. The 2wt% addition of Cu resulted in the best mechanical properties with 129.4 MPa in ultimate tensile strength and 108.4 MPa in yield strength. Furthermore, the higher corrosion rate was experienced in the alloys with higher Cu content after immersion. Zn-xCu-0.1Sr alloys all presented appropriate in vitro degradation rates in a basically uniform degradation mode. The strength, ductility and biocorrosion property exhibited by the Zn-2Cu-0.1Sr alloy compositions make it a promising candidate for cardiovascular stent applications.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"709 - 716"},"PeriodicalIF":1.8,"publicationDate":"2022-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42502980","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-29DOI: 10.1080/1478422X.2022.2127465
Kuang-Hua Hou, Li Hu, Cheng-Yueh Shih, Ching-Chang Yang
ABSTRACT In this study, the effects of pre-deformation on mechanical properties and stress corrosion cracking behaviour of 7075 alloy was investigated with SSRT and electrochemical polarization. The 10% pre-deformation substantially improves the SCC resistance of the 7075 alloys. The strain induced dislocations act as diffusion shortcuts and result in enhanced precipitation and early appearance of GBPs in the naturally aged 7075-T3. For artificial aging, pre-deformation causes rapid over-aging as larger precipitates are found in both matrix and GBs of the 7075-T8. The substitution of Cu for Zn in the GBPs and the larger GBPs acting as hydrogen traps are possible explanations for the improved SCC resistance of 7075-T8. Further improvements in SCC resistance can be found in the RRA treated 7075 alloys, while a more ductile behaviour can be seen in the pre-deformed 7075 alloy. Additionally, results of electrochemical testing are in high correlation with the SSRT results.
{"title":"Investigating the effects of pre-deformation and aging conditions on mechanical properties and SCC resistance of aluminium alloy 7075 via slow strain rate testing and electrochemical polarisation","authors":"Kuang-Hua Hou, Li Hu, Cheng-Yueh Shih, Ching-Chang Yang","doi":"10.1080/1478422X.2022.2127465","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2127465","url":null,"abstract":"ABSTRACT In this study, the effects of pre-deformation on mechanical properties and stress corrosion cracking behaviour of 7075 alloy was investigated with SSRT and electrochemical polarization. The 10% pre-deformation substantially improves the SCC resistance of the 7075 alloys. The strain induced dislocations act as diffusion shortcuts and result in enhanced precipitation and early appearance of GBPs in the naturally aged 7075-T3. For artificial aging, pre-deformation causes rapid over-aging as larger precipitates are found in both matrix and GBs of the 7075-T8. The substitution of Cu for Zn in the GBPs and the larger GBPs acting as hydrogen traps are possible explanations for the improved SCC resistance of 7075-T8. Further improvements in SCC resistance can be found in the RRA treated 7075 alloys, while a more ductile behaviour can be seen in the pre-deformed 7075 alloy. Additionally, results of electrochemical testing are in high correlation with the SSRT results.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"774 - 788"},"PeriodicalIF":1.8,"publicationDate":"2022-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49145668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-29DOI: 10.1080/1478422X.2022.2126407
Srinivas Mannepalli, A. R. Ravi Shankar, S. Ningshen, J. Philip
ABSTRACT In the present paper, an investigation was carried out to understand the microstructure or secondary phase changes formed during thermal ageing at nose temperature (where Cr diffusion was faster) and its influence on the pitting corrosion behaviour of type 316LN SS with marginally lower Cr in as-received (AR) and 10% cold work (CW). X-ray diffraction studies confirmed Cr23C6 and Cr2N in AR and CW conditions. On thermal ageing, AR material from 0 to 10 h and CW from 10 to 24 h, although with lower Cr, the degree of sensitisation (DOS) and pitting potential (E pit) were insignificant due to nitrogen where as above 10 h in AR condition and below 10 h in CW condition resulted reductions in pitting potential (E pit) in different chloride mediums. These results provide new insights on the interplay between pitting, microstructures, alloying elements.
{"title":"Localised corrosion susceptibility of nitrogen-containing type 316LN stainless steel in cold work and thermally aged conditions","authors":"Srinivas Mannepalli, A. R. Ravi Shankar, S. Ningshen, J. Philip","doi":"10.1080/1478422X.2022.2126407","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2126407","url":null,"abstract":"ABSTRACT In the present paper, an investigation was carried out to understand the microstructure or secondary phase changes formed during thermal ageing at nose temperature (where Cr diffusion was faster) and its influence on the pitting corrosion behaviour of type 316LN SS with marginally lower Cr in as-received (AR) and 10% cold work (CW). X-ray diffraction studies confirmed Cr23C6 and Cr2N in AR and CW conditions. On thermal ageing, AR material from 0 to 10 h and CW from 10 to 24 h, although with lower Cr, the degree of sensitisation (DOS) and pitting potential (E pit) were insignificant due to nitrogen where as above 10 h in AR condition and below 10 h in CW condition resulted reductions in pitting potential (E pit) in different chloride mediums. These results provide new insights on the interplay between pitting, microstructures, alloying elements.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"762 - 773"},"PeriodicalIF":1.8,"publicationDate":"2022-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44762613","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-28DOI: 10.1080/1478422X.2022.2125621
C. Verma, M. Quraishi
ABSTRACT Polyvinyl Alcohol (PVA) is a water-soluble biodegradable polymer with many industrial and biological applications. Because of its polymeric nature, reasonably high aqueous phase solubility and biodegradable properties, the use of PVA and its suitably modified derivatives as aqueous and coating phase corrosion inhibitors have acquired great recent attention. PVA and its derivatives are associated with a proper combination of hydrophilicity and hydrophobicity, essential for effective anticorrosive activity. The present review aims to describe the past and present advancements in using PVA and its derivatives as aqueous and coating phase corrosion inhibitors. Bonding of PVA with the metallic surface in anodic, basic and neutral electrolytes has also been proposed along with their orientation. They become effective by adsorbing on the metal surface. They act as mixed-type inhibitors and create a barrier to the charge transfer process. Various experimental and computational techniques are used to describe their corrosion inhibition property.
{"title":"Polyvinyl alcohol (PVA) as a biodegradable polymeric anticorrosive material: A review on present advancements and future directions","authors":"C. Verma, M. Quraishi","doi":"10.1080/1478422X.2022.2125621","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2125621","url":null,"abstract":"ABSTRACT Polyvinyl Alcohol (PVA) is a water-soluble biodegradable polymer with many industrial and biological applications. Because of its polymeric nature, reasonably high aqueous phase solubility and biodegradable properties, the use of PVA and its suitably modified derivatives as aqueous and coating phase corrosion inhibitors have acquired great recent attention. PVA and its derivatives are associated with a proper combination of hydrophilicity and hydrophobicity, essential for effective anticorrosive activity. The present review aims to describe the past and present advancements in using PVA and its derivatives as aqueous and coating phase corrosion inhibitors. Bonding of PVA with the metallic surface in anodic, basic and neutral electrolytes has also been proposed along with their orientation. They become effective by adsorbing on the metal surface. They act as mixed-type inhibitors and create a barrier to the charge transfer process. Various experimental and computational techniques are used to describe their corrosion inhibition property.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"796 - 812"},"PeriodicalIF":1.8,"publicationDate":"2022-09-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43137291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-23DOI: 10.1080/1478422X.2022.2125647
S. Korniy, I. Zin, O. Khlopyk, M. Holovchuk, M. Danyliak, B. Datsko, P. Lyutyy
ABSTRACT A two-stage synthesis of anti-corrosion pigments based on synthetic zeolites was performed. New pigments retain the zeolite framework structure in the nanopores of which the amorphised phosphate phase is formed. The pigments effectively reduce the aluminium alloy corrosion in sodium chloride solution. The most effective pigment is obtained by mechanochemical modification of zeolite with calcium cations, followed by liquid-phase treatment with zinc nitrate and sodium phosphate. The pigments induce the formation of a protective film of zinc hydroxides on intermetallic inclusions of the alloy. The formation of phosphates is possible on the anode sections. The pigments can become promising inhibitory components of primer paints used for the protection of structures made from aluminium alloys.
{"title":"Aluminium alloy corrosion inhibition by a two-stage modified nanoporous zeolite","authors":"S. Korniy, I. Zin, O. Khlopyk, M. Holovchuk, M. Danyliak, B. Datsko, P. Lyutyy","doi":"10.1080/1478422X.2022.2125647","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2125647","url":null,"abstract":"ABSTRACT A two-stage synthesis of anti-corrosion pigments based on synthetic zeolites was performed. New pigments retain the zeolite framework structure in the nanopores of which the amorphised phosphate phase is formed. The pigments effectively reduce the aluminium alloy corrosion in sodium chloride solution. The most effective pigment is obtained by mechanochemical modification of zeolite with calcium cations, followed by liquid-phase treatment with zinc nitrate and sodium phosphate. The pigments induce the formation of a protective film of zinc hydroxides on intermetallic inclusions of the alloy. The formation of phosphates is possible on the anode sections. The pigments can become promising inhibitory components of primer paints used for the protection of structures made from aluminium alloys.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"740 - 748"},"PeriodicalIF":1.8,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46251683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-09-23DOI: 10.1080/1478422X.2022.2126084
C. Wen, Qianwen Zhang, K. Qi, Zhenyu Chen, Y. Qiu, X. Guo
ABSTRACT A dual-circulation testing system was constructed to study the effect of heat flux density (q, −22.28 ∼ +22.54 kW m-2) on the corrosion of an Al–Cu–Mg–Mn alloy in 0.5 M H2SO4 at a constant metal surface temperature (50°C) under different controlling heat transfer states. Their heat transfer parameters were determined quantitatively by COMSOL simulation to keep them except q in constant, highlighting the influence of q on metal corrosion. Compared with the q = 0 condition, the positive heat flux (q > 0) improved the surface layer performance of the Al alloy to inhibit its anodic corrosion process, decreasing its corrosion current density (i corr) by 56% with increasing q to 22.54 kW m-2. While q < 0, the opposite effect occurred, increasing its i corr by 52% at q = −22.28 kW m-2. Heat flux also changed the corrosion reaction’s apparent effective activation energy (E a) and pre-factor, and E a played a dominating role in changing i corr.
{"title":"Effect of heat flux on metal corrosion in non-boiling media: testing system, heat transfer simulations, and corrosion study on Al alloy","authors":"C. Wen, Qianwen Zhang, K. Qi, Zhenyu Chen, Y. Qiu, X. Guo","doi":"10.1080/1478422X.2022.2126084","DOIUrl":"https://doi.org/10.1080/1478422X.2022.2126084","url":null,"abstract":"ABSTRACT A dual-circulation testing system was constructed to study the effect of heat flux density (q, −22.28 ∼ +22.54 kW m-2) on the corrosion of an Al–Cu–Mg–Mn alloy in 0.5 M H2SO4 at a constant metal surface temperature (50°C) under different controlling heat transfer states. Their heat transfer parameters were determined quantitatively by COMSOL simulation to keep them except q in constant, highlighting the influence of q on metal corrosion. Compared with the q = 0 condition, the positive heat flux (q > 0) improved the surface layer performance of the Al alloy to inhibit its anodic corrosion process, decreasing its corrosion current density (i corr) by 56% with increasing q to 22.54 kW m-2. While q < 0, the opposite effect occurred, increasing its i corr by 52% at q = −22.28 kW m-2. Heat flux also changed the corrosion reaction’s apparent effective activation energy (E a) and pre-factor, and E a played a dominating role in changing i corr.","PeriodicalId":10711,"journal":{"name":"Corrosion Engineering, Science and Technology","volume":"57 1","pages":"749 - 761"},"PeriodicalIF":1.8,"publicationDate":"2022-09-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41546691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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