In this study, micro‐galvanic corrosion of SAF 2205 duplex stainless steel (DSS) annealed at different temperatures with different phase ratios (α/γ) in a 1 M H2SO4 + 1 M NaCl solution is analyzed by zero resistance ammeter (ZRA), immersion and numerical simulation model. COMSOL Multiphysics is used to solve the numerical simulation model and predict the local current density, potential distribution, and morphology of DSS annealed at different temperatures with different phase ratios. The modeling results are in good agreement with the immersion test results, which indicate that the micro‐galvanic corrosion depth of SAF 2205 DSS annealed at different temperatures initially decreases and then increases with the increase in the phase ratios (α/γ). The best micro‐galvanic corrosion resistance is obtained at an annealing temperature of 1100°C.
采用零电阻电流表(ZRA)、浸渍法和数值模拟模型，研究了不同温度、不同相比(α/γ)退火的SAF 2205双相不锈钢(DSS)在1 M H2SO4 + 1 M NaCl溶液中的微电偶腐蚀。利用COMSOL Multiphysics对数值模拟模型进行求解，预测不同温度、不同相比退火后DSS的局部电流密度、电位分布和形貌。模拟结果与浸渍试验结果吻合较好，表明不同温度下退火的SAF 2205 DSS微电偶腐蚀深度随相比(α/γ)的增大先减小后增大。在1100℃的退火温度下，获得了最佳的微电腐蚀性能。
{"title":"Micro‐galvanic corrosion of duplex stainless steel annealed at different temperatures evaluated by experiments and a numerical simulation model","authors":"Xin Cao, Xiaojun Hu","doi":"10.1002/maco.202213297","DOIUrl":"https://doi.org/10.1002/maco.202213297","url":null,"abstract":"In this study, micro‐galvanic corrosion of SAF 2205 duplex stainless steel (DSS) annealed at different temperatures with different phase ratios (α/γ) in a 1 M H2SO4 + 1 M NaCl solution is analyzed by zero resistance ammeter (ZRA), immersion and numerical simulation model. COMSOL Multiphysics is used to solve the numerical simulation model and predict the local current density, potential distribution, and morphology of DSS annealed at different temperatures with different phase ratios. The modeling results are in good agreement with the immersion test results, which indicate that the micro‐galvanic corrosion depth of SAF 2205 DSS annealed at different temperatures initially decreases and then increases with the increase in the phase ratios (α/γ). The best micro‐galvanic corrosion resistance is obtained at an annealing temperature of 1100°C.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"61 1","pages":"2019 - 2031"},"PeriodicalIF":0.0,"publicationDate":"2022-08-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75635276","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}
Boriding is the process of coating the metal surface with a ceramic metal boride layer by the diffusion method. Iron borides, one of the metal borides, are called ceramics because they are covalently bonded compounds. Iron boride coatings contain strong Fe–B and B–B covalent bonds. In this study, the effect of boronizing on the corrosion resistance of AISI 1010 steel was investigated. Baybora‐1 which has recently been patented was used as boronizing agent. AISI 1010 steel was borided at 950°C for 2, 4, and 6 h using the solid method. The microstructure, hardness, and corrosion rate of the samples were investigated. The change in the corrosion rate of the samples was determined by the corrosion test specified in the ASTM G31‐72 standard. The results showed that the hardness of the iron boride layer formed on the surface as a result of the boronizing process was greater than that of the matrix. As a result of the boriding process, the hardness of the iron boride layer on the steel surface reached approximately eight times the hardness of the substrate matrix. The thickness of the iron boride layer on the steel sample surface was measured at 950°C for 2 and 6 h, respectively, as 45 ± 12 and 155 ± 13 µm. It was concluded that the boriding process increased the corrosion resistance of steel.
{"title":"Increasing corrosion resistance of AISI 1010 steel by boride coatings","authors":"S. U. Bayça, O. Bican","doi":"10.1002/maco.202213326","DOIUrl":"https://doi.org/10.1002/maco.202213326","url":null,"abstract":"Boriding is the process of coating the metal surface with a ceramic metal boride layer by the diffusion method. Iron borides, one of the metal borides, are called ceramics because they are covalently bonded compounds. Iron boride coatings contain strong Fe–B and B–B covalent bonds. In this study, the effect of boronizing on the corrosion resistance of AISI 1010 steel was investigated. Baybora‐1 which has recently been patented was used as boronizing agent. AISI 1010 steel was borided at 950°C for 2, 4, and 6 h using the solid method. The microstructure, hardness, and corrosion rate of the samples were investigated. The change in the corrosion rate of the samples was determined by the corrosion test specified in the ASTM G31‐72 standard. The results showed that the hardness of the iron boride layer formed on the surface as a result of the boronizing process was greater than that of the matrix. As a result of the boriding process, the hardness of the iron boride layer on the steel surface reached approximately eight times the hardness of the substrate matrix. The thickness of the iron boride layer on the steel sample surface was measured at 950°C for 2 and 6 h, respectively, as 45 ± 12 and 155 ± 13 µm. It was concluded that the boriding process increased the corrosion resistance of steel.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"35 1","pages":"2032 - 2040"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85528670","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 behavior and microstructure of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy (Al LEA) were investigated in different Cl− ion concentrations of acidic (HCl), neutral (NaCl), and alkaline (NaOH) media. The study was performed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The surface morphologies and chemical composition were examined by using a scanning electron microscope with energy‐dispersive X‐ray spectroscopy. The results indicated that with the increase of the Cl− ion concentrations, the degradation rate with more pits and cracks was observed in both acidic and neutral media. This is due to the breakdown of Al(OH)3/Al2O3 passive layer. In an alkaline medium, increasing of pH value from pH 8 to pH 12, there was a slight increment in corrosion rate (CR). However, the corrosion trend was not witnessed on alloy surfaces because of the formation of Mg32(Al, Zn)49 and AlCu phases, which are more stable than α‐Al. The order of Al‐LEA CR is found to be HCl > NaCl > NaOH. The results obtained from the polarization and EIS were in good agreement with each other.
{"title":"Electrochemical characterization of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy in different pH environments","authors":"P. Sudha, K. Tun, M. Gupta, A. Mourad, S. Vincent","doi":"10.1002/maco.202213103","DOIUrl":"https://doi.org/10.1002/maco.202213103","url":null,"abstract":"The corrosion behavior and microstructure of a novel multicomponent Al75Mg5Li10Zn5Cu5 low entropy alloy (Al LEA) were investigated in different Cl− ion concentrations of acidic (HCl), neutral (NaCl), and alkaline (NaOH) media. The study was performed by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) methods. The surface morphologies and chemical composition were examined by using a scanning electron microscope with energy‐dispersive X‐ray spectroscopy. The results indicated that with the increase of the Cl− ion concentrations, the degradation rate with more pits and cracks was observed in both acidic and neutral media. This is due to the breakdown of Al(OH)3/Al2O3 passive layer. In an alkaline medium, increasing of pH value from pH 8 to pH 12, there was a slight increment in corrosion rate (CR). However, the corrosion trend was not witnessed on alloy surfaces because of the formation of Mg32(Al, Zn)49 and AlCu phases, which are more stable than α‐Al. The order of Al‐LEA CR is found to be HCl > NaCl > NaOH. The results obtained from the polarization and EIS were in good agreement with each other.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"64 1","pages":"2071 - 2083"},"PeriodicalIF":0.0,"publicationDate":"2022-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77890037","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}
rGO/Mg(OH)2 composite films were fabricated on AZ61 alloy by the hydrothermal method in alkaline solutions containing deionized water and graphene oxide (GO). During the hydrothermal reaction, the Mg(OH)2 nanosheets and GO plates grew freely on the AZ61 substrate without any special orientation, and the GO was simultaneously reduced to rGO. With the increase of GO content in the hydrothermal solution, the corrosion resistance of the prepared composite films showed a trend of increasing first and then decreasing. When the content of GO incorporated in the hydrothermal solution is 5 mg, the corrosion current density (icorr) of the composite coating is reduced to the minimum (4.9 μA/cm2), which is seven times lower than that of the substrate and 3.5 times lower than that of the Mg(OH)2 monolayer. Based on experimental and molecular dynamics simulation results, the enhancement mechanism of the composite film was proposed, which is related to the growth of Mg(OH)2 layer, the “tortuous path” effect of GO and the slowing of chloride ion diffusion by GO functional groups.
{"title":"Enhancing corrosion resistance of magnesium alloy by rGO/Mg(OH)2 composite coating","authors":"Jing Yuan, Xiaofeng Cui, Rui Yuan, Qiushi Li, Xuerong Zheng","doi":"10.1002/maco.202213360","DOIUrl":"https://doi.org/10.1002/maco.202213360","url":null,"abstract":"rGO/Mg(OH)2 composite films were fabricated on AZ61 alloy by the hydrothermal method in alkaline solutions containing deionized water and graphene oxide (GO). During the hydrothermal reaction, the Mg(OH)2 nanosheets and GO plates grew freely on the AZ61 substrate without any special orientation, and the GO was simultaneously reduced to rGO. With the increase of GO content in the hydrothermal solution, the corrosion resistance of the prepared composite films showed a trend of increasing first and then decreasing. When the content of GO incorporated in the hydrothermal solution is 5 mg, the corrosion current density (icorr) of the composite coating is reduced to the minimum (4.9 μA/cm2), which is seven times lower than that of the substrate and 3.5 times lower than that of the Mg(OH)2 monolayer. Based on experimental and molecular dynamics simulation results, the enhancement mechanism of the composite film was proposed, which is related to the growth of Mg(OH)2 layer, the “tortuous path” effect of GO and the slowing of chloride ion diffusion by GO functional groups.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"83 1","pages":"2053 - 2062"},"PeriodicalIF":0.0,"publicationDate":"2022-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85582778","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}
Rongfu Xu, Yihao Ma, Wenhao Wang, Peng Qi, Guangyu Wang
In this paper, the effect of elements such as Ni, Al, and Si in gray cast iron on the atmospheric corrosion resistance of gray cast iron was studied by using corrosion weight gain, salt spray test, electrochemistry, and X‐ray diffraction. The results show that the corrosion behavior of gray cast iron can be divided into two stages. The later stage of corrosion resistance of gray cast iron with Ni element is better than the early stage of corrosion resistance, while the reverse is true for gray cast iron with Al element. There is no significant effect of increasing the Si content on the corrosion behavior of gray cast iron. The corrosion products of each specimen are all composed of Fe2O3, α‐FeOOH, γ‐FeOOH, and Fe3O4. After the comparison test, it can be concluded that the Ni element is seen to be conducive to the formation of protective rust layer with higher α‐FeOOH content. In addition, the rust layer of gray cast iron containing Al is loose and scaly, while the rust layer of gray cast iron containing Ni is dense and spongy. The addition of Ni element can make gray cast iron stable to improve the self‐corrosion potential and reduce the self‐corrosion current density, thus reducing the corrosion rate of gray cast iron.
{"title":"Study on the effect of alloying elements Ni, Al, and Si on salt spray corrosion resistance of gray cast iron","authors":"Rongfu Xu, Yihao Ma, Wenhao Wang, Peng Qi, Guangyu Wang","doi":"10.1002/maco.202213347","DOIUrl":"https://doi.org/10.1002/maco.202213347","url":null,"abstract":"In this paper, the effect of elements such as Ni, Al, and Si in gray cast iron on the atmospheric corrosion resistance of gray cast iron was studied by using corrosion weight gain, salt spray test, electrochemistry, and X‐ray diffraction. The results show that the corrosion behavior of gray cast iron can be divided into two stages. The later stage of corrosion resistance of gray cast iron with Ni element is better than the early stage of corrosion resistance, while the reverse is true for gray cast iron with Al element. There is no significant effect of increasing the Si content on the corrosion behavior of gray cast iron. The corrosion products of each specimen are all composed of Fe2O3, α‐FeOOH, γ‐FeOOH, and Fe3O4. After the comparison test, it can be concluded that the Ni element is seen to be conducive to the formation of protective rust layer with higher α‐FeOOH content. In addition, the rust layer of gray cast iron containing Al is loose and scaly, while the rust layer of gray cast iron containing Ni is dense and spongy. The addition of Ni element can make gray cast iron stable to improve the self‐corrosion potential and reduce the self‐corrosion current density, thus reducing the corrosion rate of gray cast iron.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"390 1","pages":"2041 - 2052"},"PeriodicalIF":0.0,"publicationDate":"2022-07-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82710757","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}
S. Lavrys, I. Pohrelyuk, H. Veselivska, A. Skrebtsov, Julia Kononenko, Yu.V. Marchenko
The purpose of this study was to investigate the corrosion behavior of Ti–6Al–Mo–1.5V–2Zr near‐alpha titanium alloy fabricated by additive manufacturing (AM). Titanium alloy specimens were fabricated by electron beam melting (EBM) and laser metal deposition (LMD). The same titanium alloy manufactured by traditional technology (TT) was used as a control. The correlations between corrosion resistance, microstructure and phase composition of titanium alloys fabricated by different technologies were investigated, through the use of electrochemical corrosion testing, scanning electron microscopy, X‐ray diffraction, and hardness testing. In this study, it was shown that the corrosion resistance of AM samples is lower than TT samples. The corrosion resistance of AM samples was attributed to the presence of more α′ martensite and less β‐Ti phases in the microstructure of titanium alloy than for TT samples. The electrochemical results suggest that titanium alloy fabricated by EBM has better corrosion resistance in 20% HCl solution at room temperature compared to titanium alloy fabricated by LMD.
{"title":"Corrosion behavior of near‐alpha titanium alloy fabricated by additive manufacturing","authors":"S. Lavrys, I. Pohrelyuk, H. Veselivska, A. Skrebtsov, Julia Kononenko, Yu.V. Marchenko","doi":"10.1002/maco.202213105","DOIUrl":"https://doi.org/10.1002/maco.202213105","url":null,"abstract":"The purpose of this study was to investigate the corrosion behavior of Ti–6Al–Mo–1.5V–2Zr near‐alpha titanium alloy fabricated by additive manufacturing (AM). Titanium alloy specimens were fabricated by electron beam melting (EBM) and laser metal deposition (LMD). The same titanium alloy manufactured by traditional technology (TT) was used as a control. The correlations between corrosion resistance, microstructure and phase composition of titanium alloys fabricated by different technologies were investigated, through the use of electrochemical corrosion testing, scanning electron microscopy, X‐ray diffraction, and hardness testing. In this study, it was shown that the corrosion resistance of AM samples is lower than TT samples. The corrosion resistance of AM samples was attributed to the presence of more α′ martensite and less β‐Ti phases in the microstructure of titanium alloy than for TT samples. The electrochemical results suggest that titanium alloy fabricated by EBM has better corrosion resistance in 20% HCl solution at room temperature compared to titanium alloy fabricated by LMD.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"39 1","pages":"2063 - 2070"},"PeriodicalIF":0.0,"publicationDate":"2022-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87675696","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}
Nickel aluminum bronze (NAB) and manganese aluminum bronze (MAB) are highly alloyed bronzes that are increasingly employed in several industrial sectors mainly related to the hostile environment due to their excellent resistance against corrosion, cavitation, erosion, and improved mechanical properties in comparison with other copper‐based alloys. These materials are sensitive to thermal treatments, such as welding, due to a multiphase microstructure in cast conditions. To contribute to the knowledge of the behavior of both alloys, the effect of welding processes on the corrosion behavior of NAB (CuAl10Fe5Ni5) and MAB (CuMn12Al8Fe4Ni2) is studied. As the microstructures of the parent zone (PZ), heat‐affected zone (HAZ), and weld seam (WS) may be quite different, the consequences with respect to corrosion behavior must be considered. In this study, the influence on corrosion behavior in synthetic sea water (SSW) was investigated using different welded test coupons representing identical (symmetrical) and hybrid joints of NAB and MAB. The microstructures of the welded samples were characterized by metallography using two chemical agents and examined by optical and scanning electron microscopy. By electrochemical corrosion testing, the major effect of welding processes on the corrosion behavior was found in influencing the amount and distribution of β‐phase which is prone to selective corrosion.
{"title":"Corrosion evaluation of welded nickel aluminum bronze and manganese aluminum bronze in synthetic sea water","authors":"I. Cobo, M. V. Biezma-Moraleda, P. Linhardt","doi":"10.1002/maco.202213328","DOIUrl":"https://doi.org/10.1002/maco.202213328","url":null,"abstract":"Nickel aluminum bronze (NAB) and manganese aluminum bronze (MAB) are highly alloyed bronzes that are increasingly employed in several industrial sectors mainly related to the hostile environment due to their excellent resistance against corrosion, cavitation, erosion, and improved mechanical properties in comparison with other copper‐based alloys. These materials are sensitive to thermal treatments, such as welding, due to a multiphase microstructure in cast conditions. To contribute to the knowledge of the behavior of both alloys, the effect of welding processes on the corrosion behavior of NAB (CuAl10Fe5Ni5) and MAB (CuMn12Al8Fe4Ni2) is studied. As the microstructures of the parent zone (PZ), heat‐affected zone (HAZ), and weld seam (WS) may be quite different, the consequences with respect to corrosion behavior must be considered. In this study, the influence on corrosion behavior in synthetic sea water (SSW) was investigated using different welded test coupons representing identical (symmetrical) and hybrid joints of NAB and MAB. The microstructures of the welded samples were characterized by metallography using two chemical agents and examined by optical and scanning electron microscopy. By electrochemical corrosion testing, the major effect of welding processes on the corrosion behavior was found in influencing the amount and distribution of β‐phase which is prone to selective corrosion.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"27 1","pages":"1788 - 1799"},"PeriodicalIF":0.0,"publicationDate":"2022-07-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87962860","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}
Huixia Zhang, Fuyao Hao, Yu Zhang, Xiang-bo Li, Han Guo
The corrosion behavior and mechanism of the high‐strength low‐alloy steel‐welded joint fabricated by the multilayer and multipass welding method were investigated using a scanning Kelvin probe, electrochemical measurements, and so forth. The results revealed that the microstructure of the first layer welding zone was dominated by granular bainite and acicular ferrite and was fine and uniform, which exhibited the best corrosion resistance. Whereas, since the average cooling rate decreased with the increase of welding pass, the grain size of the second and third layer weldings gradually grew, and the voltaic potential gradually decreased. In addition, the microstructure of the heat‐affected zone (HAZ) changed from the tempered sorbite structure of the equilibrium phase to the granular bainite or bainite structure of the nonequilibrium phase under the action of heat transfer. The HAZ became the weakest link for corrosion of welded joint, on account of the nonequilibrium organization and galvanic coupling among base metal, weld metal and HAZ.
{"title":"Corrosion behavior and mechanism of the high‐strength low‐alloy steel joined by multilayer and multipass welding method","authors":"Huixia Zhang, Fuyao Hao, Yu Zhang, Xiang-bo Li, Han Guo","doi":"10.1002/maco.202213154","DOIUrl":"https://doi.org/10.1002/maco.202213154","url":null,"abstract":"The corrosion behavior and mechanism of the high‐strength low‐alloy steel‐welded joint fabricated by the multilayer and multipass welding method were investigated using a scanning Kelvin probe, electrochemical measurements, and so forth. The results revealed that the microstructure of the first layer welding zone was dominated by granular bainite and acicular ferrite and was fine and uniform, which exhibited the best corrosion resistance. Whereas, since the average cooling rate decreased with the increase of welding pass, the grain size of the second and third layer weldings gradually grew, and the voltaic potential gradually decreased. In addition, the microstructure of the heat‐affected zone (HAZ) changed from the tempered sorbite structure of the equilibrium phase to the granular bainite or bainite structure of the nonequilibrium phase under the action of heat transfer. The HAZ became the weakest link for corrosion of welded joint, on account of the nonequilibrium organization and galvanic coupling among base metal, weld metal and HAZ.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"45 1","pages":"1826 - 1832"},"PeriodicalIF":0.0,"publicationDate":"2022-07-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85809566","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}
This study investigated the corrosion behavior of AISI 316L produced by direct energy deposition (DED). Microstructural and chemical analysis showed a homogeneous distribution of Si and Si–Mn inclusions of 0.5–1 µm and the Cr and Mo enrichment within interdendritic areas. Scanning Kelvin probe analysis of additively manufactured stainless steel highlighted a regular “striped‐like” surface potential feature with a potential gradient of 30 mV for a mean value of 0.320 ± 0.017 V versus standard hydrogen electrode. It can be related to the presence of the residual stress in the oxide film and the complex thermal history due to the fabrication process. A cyclic corrosion test simulating atmospheric conditions revealed the same corrosion properties for stainless steel fabricated by DED compared to cold rolled one. Various surface preparations of 316L were also exposed for corrosion tests. It was found that the “as‐received” and “brushed” surfaces exhibited poorer corrosion resistance due to the presence of an as‐build defective layer. However, prior passivation of brushed surface, machining, or mechanical grinding down to P1200 improve significantly the corrosion resistance.
{"title":"Corrosion behavior of additively manufactured AISI 316L stainless steel under atmospheric conditions","authors":"V. Helbert, S. Rioual, N. Le Bozec, D. Thierry","doi":"10.1002/maco.202213339","DOIUrl":"https://doi.org/10.1002/maco.202213339","url":null,"abstract":"This study investigated the corrosion behavior of AISI 316L produced by direct energy deposition (DED). Microstructural and chemical analysis showed a homogeneous distribution of Si and Si–Mn inclusions of 0.5–1 µm and the Cr and Mo enrichment within interdendritic areas. Scanning Kelvin probe analysis of additively manufactured stainless steel highlighted a regular “striped‐like” surface potential feature with a potential gradient of 30 mV for a mean value of 0.320 ± 0.017 V versus standard hydrogen electrode. It can be related to the presence of the residual stress in the oxide film and the complex thermal history due to the fabrication process. A cyclic corrosion test simulating atmospheric conditions revealed the same corrosion properties for stainless steel fabricated by DED compared to cold rolled one. Various surface preparations of 316L were also exposed for corrosion tests. It was found that the “as‐received” and “brushed” surfaces exhibited poorer corrosion resistance due to the presence of an as‐build defective layer. However, prior passivation of brushed surface, machining, or mechanical grinding down to P1200 improve significantly the corrosion resistance.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"21 1","pages":"1833 - 1843"},"PeriodicalIF":0.0,"publicationDate":"2022-07-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81816438","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 electrochemical corrosion behavior of Ti‐3Mo alloys under different accelerated corrosion tests including seawater corrosion, soil corrosion, and stray current corrosion was investigated. Results showed that the icorr value gradually increased with the increase of NaCl/Na2SO4 concentration, indicating a worsening corrosion resistance of Ti‐3Mo alloy. The presence of stray current seriously destroyed the oxide film on the sample surface, and inhibited the regeneration of oxide film, thereby resulting in the deterioration of corrosion resistance. Besides this, the potential difference between duplex phases was prone to form a microgalvanic coupling, which promoted the dissolution of local regions.
{"title":"Electrochemical corrosion behavior of Ti‐3Mo alloy under different accelerated corrosion tests","authors":"Youcong Huang, Zhongnan Zheng, Zhiwei Fu, Ying Zhang, Jun Xu, Shaokang Chen, Hao Zhang","doi":"10.1002/maco.202213348","DOIUrl":"https://doi.org/10.1002/maco.202213348","url":null,"abstract":"The electrochemical corrosion behavior of Ti‐3Mo alloys under different accelerated corrosion tests including seawater corrosion, soil corrosion, and stray current corrosion was investigated. Results showed that the icorr value gradually increased with the increase of NaCl/Na2SO4 concentration, indicating a worsening corrosion resistance of Ti‐3Mo alloy. The presence of stray current seriously destroyed the oxide film on the sample surface, and inhibited the regeneration of oxide film, thereby resulting in the deterioration of corrosion resistance. Besides this, the potential difference between duplex phases was prone to form a microgalvanic coupling, which promoted the dissolution of local regions.","PeriodicalId":18223,"journal":{"name":"Materials and Corrosion","volume":"5 1","pages":"1888 - 1899"},"PeriodicalIF":0.0,"publicationDate":"2022-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82191024","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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