时效温度对AM355高强不锈钢耐点蚀性能的影响
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摘要
综合运用动电位扫描极化曲线和动电位电化学阻抗谱研究了不同时效温度下AM355半奥氏体沉淀硬化不锈钢在3.5%(质量分数)Na Cl溶液中的点蚀行为。极化曲线的结果表明,时效时间均为4 h时,时效温度为350℃的点蚀电位Eb100最高,在动电位扫描极化曲线反向扫描过程中,均未出现保护电位Ep,钢表面产生蚀孔后再钝化能力较差。实验结果显示,时效温度会影响合金元素分布,析出相变化与点蚀电位成反比,到一定温度后,点蚀电位与残余奥氏体变化同步。
The effect of aging treatment at different temperature on the pitting corrosion behavior of stainless steel AM355 in 3.5%(mass fraction)Na Cl solution was studied by means of potentiodynamic polarization technique and dynamic electrochemical impedance spectrum. The result showed that among others the pitting potential was the highest for the steel aged at 350 ℃ for 4 h. The repassivation potential didn't appear during reversed scanning for all the steels aged at different temperatures indicated they are hard to be repassivated. The aging temperature also showed effect on the distribution of alloying elements, while, the variation of Ebwas related to the among of precipitated phase and residual austenite of the steel.
The effect of aging treatment at different temperature on the pitting corrosion behavior of stainless steel AM355 in 3.5%(mass fraction)Na Cl solution was studied by means of potentiodynamic polarization technique and dynamic electrochemical impedance spectrum. The result showed that among others the pitting potential was the highest for the steel aged at 350 ℃ for 4 h. The repassivation potential didn't appear during reversed scanning for all the steels aged at different temperatures indicated they are hard to be repassivated. The aging temperature also showed effect on the distribution of alloying elements, while, the variation of Ebwas related to the among of precipitated phase and residual austenite of the steel.
引文
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[8]Cao C N,Zhang J Q.An Introduction to Electrochemical Impedance Spectroscopy[M].Beijing:Science Press,2002(曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2002)
[9]Nagarajan S,Karthega M,Rajendran N.Pitting corrosion studies of super austenitic stainless steels in natural sea water using dynamic electrochemical impedance spectroscopy[J].J.Appl.Electrochem.,2007,37:195
[10]Wang Y,Tang Y,Xie C S,et al.The applications of the electrochemical impedance spectroscopy in the materials researches[J].Mater.Rev.,2011,25(7):5(王芸,汤滢,谢长生等.电化学阻抗谱在材料研究中的应用[J].材料导报,2011,25(7):5)
[11]Hu J Q,Liu R P,Liang J X,et al.Effects of intermediate treatment on microstructure and mechanical properties of AM355 stainless steel[J].Heat Treat.Met.,2015,40(6):91(胡家齐,刘荣佩,梁剑雄等.调整处理对AM355不锈钢微观组织与力学性能的影响[J].金属热处理,2015,40(6):91)
[12]Lei X W,Feng Y R,Zhang J X,et al.Impact of reversed austenite on the pitting corrosion behavior of super 13Cr martensitic stainless steel[J].Electrochim.Acta,2016,191:640
[2]Du N,Ye C,Tian W M,et al.304 Stainless steel pitting behavior by means of electrochemical impedance spectroscopy[J].J.Mater.Eng.,2014,(6):68(杜楠,叶超,田文明等.304不锈钢点蚀行为的电化学阻抗谱研究[J].材料工程,2014,(6):68)
[3]Yang W,Gu J X,Li Q S,et al.The Local Corrosion of Metals[M].Beijing:Chemical Industry Press,1995(杨武,顾濬祥,黎樵燊等.金属的局部腐蚀[M].北京:化学工业出版社,1995)
[4]The State Bureau of Quality and Technical Supervision.GB/T17899-1999 Method of pitting potential measurement for stainless steels[S].Beijing:Standards Press of China,1999(国家质量技术监督局.GB/T17899-1999不锈钢点蚀电位测量方法[S].北京:中国标准出版社,1999)
[5]Sun M.Electrochemical and stress corrosion cracking behaviors of new ultra-high strength steels in simulated marine atmospheric environment[D].Beijing:University of Science and Technology Beijing,2012(孙敏.新型超高强度钢模拟海洋大气环境电化学及应力腐蚀研究[D].北京:北京科技大学,2012)
[6]Jia Z J,Du C W,Li C T,et al.Study on pitting process of 316L stainless steel by means of staircase potential electrochemical impedance spectroscopy[J].Int.J.Miner.Metall.Mater.,2011,18:48
[7]Cheng X Q,Li C T,Dong C F,et al.Constituent phases of the passive film formed on 2205 stainless steel by dynamic electrochemical impedance spectroscopy[J].Int.J.Miner.Metall.Mater.,2011,18:42
[8]Cao C N,Zhang J Q.An Introduction to Electrochemical Impedance Spectroscopy[M].Beijing:Science Press,2002(曹楚南,张鉴清.电化学阻抗谱导论[M].北京:科学出版社,2002)
[9]Nagarajan S,Karthega M,Rajendran N.Pitting corrosion studies of super austenitic stainless steels in natural sea water using dynamic electrochemical impedance spectroscopy[J].J.Appl.Electrochem.,2007,37:195
[10]Wang Y,Tang Y,Xie C S,et al.The applications of the electrochemical impedance spectroscopy in the materials researches[J].Mater.Rev.,2011,25(7):5(王芸,汤滢,谢长生等.电化学阻抗谱在材料研究中的应用[J].材料导报,2011,25(7):5)
[11]Hu J Q,Liu R P,Liang J X,et al.Effects of intermediate treatment on microstructure and mechanical properties of AM355 stainless steel[J].Heat Treat.Met.,2015,40(6):91(胡家齐,刘荣佩,梁剑雄等.调整处理对AM355不锈钢微观组织与力学性能的影响[J].金属热处理,2015,40(6):91)
[12]Lei X W,Feng Y R,Zhang J X,et al.Impact of reversed austenite on the pitting corrosion behavior of super 13Cr martensitic stainless steel[J].Electrochim.Acta,2016,191:640