Wei Wu, Niyun Liu, Peilin Chai, Li-li Zhu, Shiyu Huang, Ying Yang, Bo Zhao, Zhiyong Liu
The corrosion behaviors of Sb‐free and Sb‐added low‐alloy structural steels were comparatively studied in a real tropical marine atmosphere. And the role of Sb addition on corrosion resistance was clarified by electrochemical measurement and rust analysis. The results showed that the addition of 0.05% Sb increased the polarization resistance, reduced the cathodic current density, and slowed down the oxygen reduction process. Meanwhile, Sb addition optimized the physical structure, promoted the transformation of phase, and improved the protection of the rust. More importantly, 0.05% Sb addition inhibited the local acidification at the bottom of the pits, thus slowing down the local corrosion process at the rust/matrix interface. Accordingly, the corrosion resistance of the Sb‐added low‐alloy steel was enhanced, causing a lower corrosion rate than that of Sb‐free steel in a tropical marine atmosphere.
{"title":"Roles of Sb addition on the corrosion resistance of the low‐alloy steel in a real tropical marine atmosphere","authors":"Wei Wu, Niyun Liu, Peilin Chai, Li-li Zhu, Shiyu Huang, Ying Yang, Bo Zhao, Zhiyong Liu","doi":"10.1002/maco.202112818","DOIUrl":"https://doi.org/10.1002/maco.202112818","url":null,"abstract":"The corrosion behaviors of Sb‐free and Sb‐added low‐alloy structural steels were comparatively studied in a real tropical marine atmosphere. And the role of Sb addition on corrosion resistance was clarified by electrochemical measurement and rust analysis. The results showed that the addition of 0.05% Sb increased the polarization resistance, reduced the cathodic current density, and slowed down the oxygen reduction process. Meanwhile, Sb addition optimized the physical structure, promoted the transformation of phase, and improved the protection of the rust. More importantly, 0.05% Sb addition inhibited the local acidification at the bottom of the pits, thus slowing down the local corrosion process at the rust/matrix interface. Accordingly, the corrosion resistance of the Sb‐added low‐alloy steel was enhanced, causing a lower corrosion rate than that of Sb‐free steel in a tropical marine atmosphere.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"161 1","pages":"733 - 746"},"PeriodicalIF":0.0,"publicationDate":"2022-01-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77730069","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}
MCrAlY coatings made by electron beam physical vapor deposition or thermal spray are often used to provide protection for superalloys against high‐temperature oxidation and corrosion. In addition to Y, other elements such as Ta, Hf, and Si have been reported to be beneficial. In this paper, NiCoCrAlX (where X = Y, Ta, Hf, and/or Si) coatings were fabricated via an electrolytic codeposition process in a sulfate‐based Ni–Co plating solution. As compared to uncoated René 80 substrates, the electro‐codeposited NiCoCrAlX coatings demonstrated superior performance during oxidation testing with a 1‐h cycle frequency at 1000°C and 1100°C. Further improved oxidation resistance was observed for the coatings with Hf and Si additions, but not with the addition of Ta. The levels of S, Y, and O in the electrodeposited NiCoCrAlY coating were measured by high‐resolution glow discharge mass spectrometry and were compared to those in thermal spray coatings.
由电子束物理气相沉积或热喷涂制成的MCrAlY涂层通常用于保护高温合金免受高温氧化和腐蚀。除Y外，其他元素如Ta、Hf和Si也被认为是有益的。在本文中，NiCoCrAlX(其中X = Y, Ta, Hf和/或Si)涂层在硫酸盐基Ni-Co镀液中通过电解共沉积工艺制备。与未涂覆的ren 80基材相比，电共沉积NiCoCrAlX涂层在1000°C和1100°C下的1 h循环频率氧化测试中表现出优越的性能。添加Hf和Si后涂层的抗氧化性能得到进一步提高，而添加Ta后涂层的抗氧化性能没有提高。采用高分辨率辉光放电质谱法测定了电沉积NiCoCrAlY涂层中S、Y和O的含量，并与热喷涂涂层进行了比较。
{"title":"Cyclic oxidation behavior of MCrAlX coatings made by electrolytic codeposition","authors":"Ying Zhang, Jason Witman, S. Dryepondt","doi":"10.1002/maco.202112843","DOIUrl":"https://doi.org/10.1002/maco.202112843","url":null,"abstract":"MCrAlY coatings made by electron beam physical vapor deposition or thermal spray are often used to provide protection for superalloys against high‐temperature oxidation and corrosion. In addition to Y, other elements such as Ta, Hf, and Si have been reported to be beneficial. In this paper, NiCoCrAlX (where X = Y, Ta, Hf, and/or Si) coatings were fabricated via an electrolytic codeposition process in a sulfate‐based Ni–Co plating solution. As compared to uncoated René 80 substrates, the electro‐codeposited NiCoCrAlX coatings demonstrated superior performance during oxidation testing with a 1‐h cycle frequency at 1000°C and 1100°C. Further improved oxidation resistance was observed for the coatings with Hf and Si additions, but not with the addition of Ta. The levels of S, Y, and O in the electrodeposited NiCoCrAlY coating were measured by high‐resolution glow discharge mass spectrometry and were compared to those in thermal spray coatings.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"20 1","pages":"747 - 757"},"PeriodicalIF":0.0,"publicationDate":"2022-01-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85543042","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}
Present efforts to support the essential industrial‐scale electrolytic production of copper‐based metal powders urgently require approaches to the real‐time predicting of corrosion of copper cathodes employed in electrolytic production processes. However, current approaches are extremely limited owing to the difficulty of accurately modeling the complex cathode corrosion process. In this study, the corrosion process under different parameters was analyzed by a self‐designed continuous electrolytic corrosion experimental device, clarify the influence mechanism of current density on the corrosion of the solid–liquid–gas interface area, and addresses this issue by applying a random forest machine learning approach based on three process parameters, including the electrolyte temperature, liquid‐level fluctuation cycle period, and current density. The dataset employed in the model is obtained using a novel experimental corrosion test method based on electrode arrays. The experimental results include the corrosion rates of copper cathode plates at different positions relative to the liquid electrolyte level during the electrolysis process. The resulting stochastic model is demonstrated to obtain a high prediction accuracy of 97% for the various regions of copper cathode plates defined according to liquid electrolyte level.
{"title":"Machine learning‐based analysis and prediction of the interfacial corrosion processes of copper cathode plates during the electrolytic production of copper powders","authors":"Youzhi Zhou, Pengcheng Lin, Xin Ke, Qiang Hu, Qi Shi, Jingguo Zhang, Zhong Wang, Limin Wang","doi":"10.1002/maco.202112977","DOIUrl":"https://doi.org/10.1002/maco.202112977","url":null,"abstract":"Present efforts to support the essential industrial‐scale electrolytic production of copper‐based metal powders urgently require approaches to the real‐time predicting of corrosion of copper cathodes employed in electrolytic production processes. However, current approaches are extremely limited owing to the difficulty of accurately modeling the complex cathode corrosion process. In this study, the corrosion process under different parameters was analyzed by a self‐designed continuous electrolytic corrosion experimental device, clarify the influence mechanism of current density on the corrosion of the solid–liquid–gas interface area, and addresses this issue by applying a random forest machine learning approach based on three process parameters, including the electrolyte temperature, liquid‐level fluctuation cycle period, and current density. The dataset employed in the model is obtained using a novel experimental corrosion test method based on electrode arrays. The experimental results include the corrosion rates of copper cathode plates at different positions relative to the liquid electrolyte level during the electrolysis process. The resulting stochastic model is demonstrated to obtain a high prediction accuracy of 97% for the various regions of copper cathode plates defined according to liquid electrolyte level.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"77 1","pages":"811 - 825"},"PeriodicalIF":0.0,"publicationDate":"2022-01-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79345430","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}
The aim of this study is to develop polymeric thin films for corrosion protection of magnesium alloy AZ31. As polymer matrix, poly(4‐vinyl pyridine) (P4VP) is selected due to its semiconducting properties and protonic conductivity. Polyacrylic acid is tested as crosslinking layers to improve interfacial adhesion. The macroscopic corrosion properties of the multilayer coatings are investigated by means of electrochemical methods, such as linear sweep voltammetry and electrochemical impedance spectroscopy (EIS), in corrosive media simulating technical and biomedical applications. It is demonstrated that thin multilayer coatings can suppress the corrosion rates of magnesium alloys. To our best knowledge, this is the first demonstration of the use of P4VP as a conducting polymer film with protonic conductivity for corrosion protection of magnesium alloys.
{"title":"Corrosion protection properties of poly(4‐vinyl pyridine) containing multilayer polymeric coatings on magnesium alloy AZ31","authors":"Chayanika Das, Eleni Kastania, J. Witt, O. Ozcan","doi":"10.1002/maco.202112708","DOIUrl":"https://doi.org/10.1002/maco.202112708","url":null,"abstract":"The aim of this study is to develop polymeric thin films for corrosion protection of magnesium alloy AZ31. As polymer matrix, poly(4‐vinyl pyridine) (P4VP) is selected due to its semiconducting properties and protonic conductivity. Polyacrylic acid is tested as crosslinking layers to improve interfacial adhesion. The macroscopic corrosion properties of the multilayer coatings are investigated by means of electrochemical methods, such as linear sweep voltammetry and electrochemical impedance spectroscopy (EIS), in corrosive media simulating technical and biomedical applications. It is demonstrated that thin multilayer coatings can suppress the corrosion rates of magnesium alloys. To our best knowledge, this is the first demonstration of the use of P4VP as a conducting polymer film with protonic conductivity for corrosion protection of magnesium alloys.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"7 1","pages":"427 - 435"},"PeriodicalIF":0.0,"publicationDate":"2021-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77708130","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}
Monika Chlewicka, A. Dobkowska, R. Sitek, B. Adamczyk‐Cieślak, J. Mizera
The aim of this study is to produce Ti–AlN via selective laser melting. The results show that the microstructure of the produced alloy is not uniform. The X‐ray diffraction measurements show that the Ti–AlN composite is composed of a Ti matrix, AlN compounds, as well as (TiN)0.88, Al6Ti19, and Al1.1Ti0.9 intermetallics. The as‐printed Ti–AlN is also composed of dendrites of two typical titanium nitrides (TiN and Ti2N) and titanium aluminum nitride (Ti2AlN). Subsequent quenching and annealing slightly change the phase composition of the alloy and is the main reason for their different corrosion behaviors in acidic and chloride‐containing solutions. The results of this study show that the formation of Al‐rich ternary phases improved the corrosion resistance of the three‐dimensional‐printed Ti–AlN after quenching.
{"title":"Microstructure and corrosion resistance characteristics of Ti–AlN composite produced by selective laser melting","authors":"Monika Chlewicka, A. Dobkowska, R. Sitek, B. Adamczyk‐Cieślak, J. Mizera","doi":"10.1002/maco.202112703","DOIUrl":"https://doi.org/10.1002/maco.202112703","url":null,"abstract":"The aim of this study is to produce Ti–AlN via selective laser melting. The results show that the microstructure of the produced alloy is not uniform. The X‐ray diffraction measurements show that the Ti–AlN composite is composed of a Ti matrix, AlN compounds, as well as (TiN)0.88, Al6Ti19, and Al1.1Ti0.9 intermetallics. The as‐printed Ti–AlN is also composed of dendrites of two typical titanium nitrides (TiN and Ti2N) and titanium aluminum nitride (Ti2AlN). Subsequent quenching and annealing slightly change the phase composition of the alloy and is the main reason for their different corrosion behaviors in acidic and chloride‐containing solutions. The results of this study show that the formation of Al‐rich ternary phases improved the corrosion resistance of the three‐dimensional‐printed Ti–AlN after quenching.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"1 1","pages":"451 - 459"},"PeriodicalIF":0.0,"publicationDate":"2021-12-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88888859","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}
The corrosion inhibiting effect of the tannin from Acacia mearnsii bark on API 5CT K55 steel, used for casing in the oil and gas industry, was investigated in 1 M HCl medium with different tannin concentrations. Corrosion was monitored by electrochemical tests using potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS). Complementary analyses of the corroded surfaces were performed by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X‐ray diffraction (XRD). With the application of A. mearnsii tannin, the cathodic branch of the PP curves shifted to lower corrosion current density values. EIS analysis indicated that inhibitor molecules were adsorbed on the steel surface, which provided protection against corrosion. The SEM, AFM, and XRD data showed that in the presence of the inhibitor, a film and amorphous material were adsorbed on the steel surface, plausibly associated with the formation of tannates. The highest inhibition efficiency was obtained at an inhibitor concentration of 0.7 5 g L−1 (92% determined by PP and 98% by EIS), and a high degree of surface coverage was observed, compared with that obtained using the other concentrations of tannin.
在不同单宁浓度的1 M HCl介质中，研究了相思皮单宁对石油天然气套管用API 5CT K55钢的缓蚀作用。采用动电位极化(PP)和电化学阻抗谱(EIS)监测腐蚀情况。通过扫描电子显微镜(SEM)、原子力显微镜(AFM)和X射线衍射仪(XRD)对腐蚀表面进行了补充分析。在单宁的作用下，PP曲线的阴极分支向较低的腐蚀电流密度值偏移。EIS分析表明，缓蚀剂分子被吸附在钢的表面，起到了抗腐蚀的作用。SEM, AFM和XRD数据表明，在抑制剂存在的情况下，钢表面吸附了一层薄膜和非晶物质，可能与单宁酸盐的形成有关。当抑制剂浓度为0.7 g L−1时，获得了最高的抑制效率(PP测定92%，EIS测定98%)，与使用其他浓度的单宁相比，观察到高的表面覆盖率。
{"title":"Inhibition of corrosion of API K55 steel by tannin from Acacia mearnsii bark in highly acidic medium","authors":"K. G. Bacca, N. Lopes, E. M. Costa","doi":"10.1002/maco.202112744","DOIUrl":"https://doi.org/10.1002/maco.202112744","url":null,"abstract":"The corrosion inhibiting effect of the tannin from Acacia mearnsii bark on API 5CT K55 steel, used for casing in the oil and gas industry, was investigated in 1 M HCl medium with different tannin concentrations. Corrosion was monitored by electrochemical tests using potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS). Complementary analyses of the corroded surfaces were performed by scanning electron microscopy (SEM), atomic force microscopy (AFM), and X‐ray diffraction (XRD). With the application of A. mearnsii tannin, the cathodic branch of the PP curves shifted to lower corrosion current density values. EIS analysis indicated that inhibitor molecules were adsorbed on the steel surface, which provided protection against corrosion. The SEM, AFM, and XRD data showed that in the presence of the inhibitor, a film and amorphous material were adsorbed on the steel surface, plausibly associated with the formation of tannates. The highest inhibition efficiency was obtained at an inhibitor concentration of 0.7 5 g L−1 (92% determined by PP and 98% by EIS), and a high degree of surface coverage was observed, compared with that obtained using the other concentrations of tannin.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"88 3","pages":"613 - 622"},"PeriodicalIF":0.0,"publicationDate":"2021-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91452615","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}
Yucong Ma, M. Talha, Qi Wang, Qiancheng Zhao, Zhonghui Li, Yuanhua Lin
Chitosan (CTS) coatings have been studied as a biocompatible coating on biodegradable magnesium (Mg) alloys to improve the corrosion resistance and bioactivity for medical implants. However, the loose structure of the CTS coating cannot provide ideal long‐time corrosion resistance in the physiological environment. In this study, a nano‐SiO2/CTS composite coating was applied on an Mg alloy substrate using the sol–gel method. The surface characteristics of the samples were examined by Fourier‐transform infrared analysis, X‐ray diffraction, scanning electron microscopy‐energy‐dispersive spectrometry, and contact angle measurements. The particle size and suitable dispersion of the SiO2 nanoparticles inside the composite coating were confirmed by transmission electron microscopy. Further, the corrosion protection behavior of the coatings was examined in a simulated body fluid using potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning electrochemical microscopy analyses. Atomic force microscopy was used to determine the surface morphologies of the samples after the polarization test. The surface characteristics, electrochemical measurements, and immersion test revealed that the SiO2 nanoparticles effectively filled the voids of the CTS coating and significantly improved the corrosion resistance. The optimal concentration of nano‐SiO2 is 1.0 g/L.
{"title":"Nano‐silica/chitosan composite coatings on biodegradable magnesium alloys for enhanced corrosion resistance in simulated body fluid","authors":"Yucong Ma, M. Talha, Qi Wang, Qiancheng Zhao, Zhonghui Li, Yuanhua Lin","doi":"10.1002/maco.202112701","DOIUrl":"https://doi.org/10.1002/maco.202112701","url":null,"abstract":"Chitosan (CTS) coatings have been studied as a biocompatible coating on biodegradable magnesium (Mg) alloys to improve the corrosion resistance and bioactivity for medical implants. However, the loose structure of the CTS coating cannot provide ideal long‐time corrosion resistance in the physiological environment. In this study, a nano‐SiO2/CTS composite coating was applied on an Mg alloy substrate using the sol–gel method. The surface characteristics of the samples were examined by Fourier‐transform infrared analysis, X‐ray diffraction, scanning electron microscopy‐energy‐dispersive spectrometry, and contact angle measurements. The particle size and suitable dispersion of the SiO2 nanoparticles inside the composite coating were confirmed by transmission electron microscopy. Further, the corrosion protection behavior of the coatings was examined in a simulated body fluid using potentiodynamic polarization, electrochemical impedance spectroscopy, and scanning electrochemical microscopy analyses. Atomic force microscopy was used to determine the surface morphologies of the samples after the polarization test. The surface characteristics, electrochemical measurements, and immersion test revealed that the SiO2 nanoparticles effectively filled the voids of the CTS coating and significantly improved the corrosion resistance. The optimal concentration of nano‐SiO2 is 1.0 g/L.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"2 1","pages":"436 - 450"},"PeriodicalIF":0.0,"publicationDate":"2021-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86977733","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}
The relationship between the corrosion behavior of Mg–Gd–Y–Zn alloy and the content of rare earth elements was investigated. The results show that the Mg–4Gd–2Zn (VZ42) contains only α‐Mg matrix and W phase, while there are α‐Mg matrix, W phase and X phase in Mg–2Gd–2Y–2Zn (VWZ) and Mg–4Y–2Zn (WZ42). The corrosion rates measured by weight loss of VZ42, VWZ, and WZ42 are 8.17, 4.49, and 6.05 mm/year, respectively. Through the observation of microstructure, it is found that the corrosion first occurs around the W phase, which means that the micro galvanic effect caused by the W phase is more serious than that of the X phase. The more W phase, the greater the corrosion rate of the alloy. But continuously distributed layered X phase will form a barrier and protect α‐Mg from corrosion. It is found that different distribution of the second phase will also lead to different corrosion resistance.
{"title":"Study on the microstructure and corrosion behavior of Mg–(4 − x)Gd–xY–2Zn (x = 0, 2, 4 wt%) alloy","authors":"Yunhao Wang, Zili Liu, Xiqin Liu, Huanjian Xie, Yong Shi, Fang Liu, Jian Li","doi":"10.1002/maco.202112753","DOIUrl":"https://doi.org/10.1002/maco.202112753","url":null,"abstract":"The relationship between the corrosion behavior of Mg–Gd–Y–Zn alloy and the content of rare earth elements was investigated. The results show that the Mg–4Gd–2Zn (VZ42) contains only α‐Mg matrix and W phase, while there are α‐Mg matrix, W phase and X phase in Mg–2Gd–2Y–2Zn (VWZ) and Mg–4Y–2Zn (WZ42). The corrosion rates measured by weight loss of VZ42, VWZ, and WZ42 are 8.17, 4.49, and 6.05 mm/year, respectively. Through the observation of microstructure, it is found that the corrosion first occurs around the W phase, which means that the micro galvanic effect caused by the W phase is more serious than that of the X phase. The more W phase, the greater the corrosion rate of the alloy. But continuously distributed layered X phase will form a barrier and protect α‐Mg from corrosion. It is found that different distribution of the second phase will also lead to different corrosion resistance.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"63 1","pages":"602 - 612"},"PeriodicalIF":0.0,"publicationDate":"2021-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83997746","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}
Z. Golshani, Hossein Cheraghi Moezabad, Mahnaz Amiri, G. Sajadi, R. Naghizade, S. Hosseini
Natural extracts have been widely used to protect metal materials from corrosion. Mild steel (MS) corrosion inhibition in 0.5 M sulfuric acid was investigated in the absence and presence of Thyme leaf extracts as an economical corrosion inhibitor. The effects of various concentrations and different temperatures on inhibitor efficacy were investigated. Using electrochemical impedance spectroscopy and polarization curves, the corrosion resistance of the alloy was also estimated. The polarization technique indicated that the Thyme extract is a mixed‐type inhibitor for MS in 0.5 M H2SO4. The obtained results revealed an excellent inhibition efficiency of 98% at 200 ppm of Thyme concentration. The thermodynamic parameters calculated, the effects of temperature, and the adsorption mechanism were also investigated, that suggested formation of monolayer inhibitor molecules (i.e. the Langmuir adsorption isotherm) on the metal surface. The ∆Gadso value calculated from the Langmuir adsorption isotherm plots for inhibitor indicated that it was adsorbed on the alloy surface via a physisorption mechanism. Additional studies on plant extracts as corrosion inhibitors on metals are needed to produce solutions for industrial purposes.
天然提取物被广泛用于保护金属材料免受腐蚀。研究了百里香叶提取物在0.5 M硫酸中对低碳钢(MS)的缓蚀作用。考察了不同浓度和温度对缓蚀剂效果的影响。利用电化学阻抗谱和极化曲线对合金的耐蚀性进行了评价。极化技术表明百里香提取物在0.5 M H2SO4中为混合型质谱抑制剂。结果表明，在百里香浓度为200ppm时，百里香的抑菌率为98%。热力学参数的计算、温度的影响以及吸附机理的研究表明，金属表面形成了单层抑制剂分子(即Langmuir吸附等温线)。通过Langmuir吸附等温线图计算出缓蚀剂的∆Gadso值，表明缓蚀剂通过物理吸附机制吸附在合金表面。植物提取物作为金属的缓蚀剂需要进一步的研究，以生产工业用途的解决方案。
{"title":"Effect of Thyme extract as an ecofriendly inhibitor for corrosion of mild steel in acidic media","authors":"Z. Golshani, Hossein Cheraghi Moezabad, Mahnaz Amiri, G. Sajadi, R. Naghizade, S. Hosseini","doi":"10.1002/maco.202112769","DOIUrl":"https://doi.org/10.1002/maco.202112769","url":null,"abstract":"Natural extracts have been widely used to protect metal materials from corrosion. Mild steel (MS) corrosion inhibition in 0.5 M sulfuric acid was investigated in the absence and presence of Thyme leaf extracts as an economical corrosion inhibitor. The effects of various concentrations and different temperatures on inhibitor efficacy were investigated. Using electrochemical impedance spectroscopy and polarization curves, the corrosion resistance of the alloy was also estimated. The polarization technique indicated that the Thyme extract is a mixed‐type inhibitor for MS in 0.5 M H2SO4. The obtained results revealed an excellent inhibition efficiency of 98% at 200 ppm of Thyme concentration. The thermodynamic parameters calculated, the effects of temperature, and the adsorption mechanism were also investigated, that suggested formation of monolayer inhibitor molecules (i.e. the Langmuir adsorption isotherm) on the metal surface. The ∆Gadso value calculated from the Langmuir adsorption isotherm plots for inhibitor indicated that it was adsorbed on the alloy surface via a physisorption mechanism. Additional studies on plant extracts as corrosion inhibitors on metals are needed to produce solutions for industrial purposes.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"149 1","pages":"460 - 469"},"PeriodicalIF":0.0,"publicationDate":"2021-11-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75748045","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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