重力对304不锈钢点蚀行为的影响
Effect of Gravity on Pitting Behavior of 304 Stainless Steel
摘 要
采用恒电位极化法、电化学阻抗谱和三维视频显微镜研究了304不锈钢在3.5% NaCl溶液中水平放置和垂直放置时的点蚀行为。结果表明, 试样垂直放置比水平放置更易达到稳定点腐蚀, 由于重力作用使垂直放置的蚀孔内腐蚀产物更易扩散到孔外, 加速点蚀的诱发和亚稳态点蚀向稳态点蚀的转变。阻抗谱等效电路中元件参数的分析结果表明, 垂直放置的试样表面局部腐蚀比水平放置的更严重。
重力
三维视频显微镜
电化学阻抗谱
pitting
gravity
3-D video microscopy
EIS
Abstract
Potentiostatic polarization, EIS and three-dimensional video microscopy were used to study the pitting behavior of 304 stainless steels placed horizontally and vertically respectively in 3.5% NaCl solution. The results indicated that the specimen in vertical position generated pits easily than that in horizontal position. The gravity let the corrosion products in pits of the specimen in vertical position diffuse out of the pits more easily, which could accelerate the nucleation of pits and the transition rate of metastable pits to stable growth. The results of element parameters of the equivalent circuit analysis showed the localized corrosion on the surface of the specimen in vertical position was more serious than that in horizontal position.
中图分类号 TG172
所属栏目 试验研究
基金项目 国家自然科学基金(51071083)
收稿日期 2014/2/24
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网络出版日期
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联系人作者杜楠(dunan@sina.com)
备注杜楠(1956-),教授,硕士,从事电化学相关研究,0791-83863187.
引用该论文: AI Ying-jun,DU Nan,ZHAO Qing,YE Chao,WANG Li-qiang,WEN Qing-jie. Effect of Gravity on Pitting Behavior of 304 Stainless Steel[J]. Corrosion & Protection, 2014, 35(12): 1182
被引情况:
【1】黄世新,杜楠,赵晴,艾莹珺,王力强,文庆杰, "Fe3+水解及其对304不锈钢点蚀行为的影响",腐蚀与防护 37, 453-457(2016)
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参考文献
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【3】BERTHOME G,MALKI B,BAROUX B. Pitting transients analysis of stainless steels at the open circuit potential[J]. Corrosion Science,2006,48:2432-2441.
【4】WANG M F,LI X G,DU N,et al. Direct evidence of initial pitting corrosion[J]. Electrochemistry Communications,2008,10(7):1000-1004.
【5】PUJAR M G,ANITA T,SHAIKH H,et al. Use of electrochemical noise (EN) technique to study the effect of sulfate and chloride ions on passivation and pitting corrosion behavior of 316 stainless steel[J]. Journal of Materials Engineering and Performance,2007,16(4):494-499.
【6】ERNST P,NEWMAN R C. Pit growth studies in stainless steel foils. II: Effect of temperature chloride concentration and sulphate addition[J]. Corrosion Science,2002,44(5):943-954.
【7】HONG T,NAGUMO M. The effect of chloride concentration on the early stages of pitting for type 304 stainless steel revealed by the ac impedance method[J]. Corrosion Science,1997,39(2):285-293．
【8】PARDO A,OTERO E,MERINO M C,et al. Influence of pH and chloride concentration on the pitting and crevice corrosion behavior of high-alloy stainless steels[J]. Corrosion,2000,56(4):411-418.
【9】梁成浩,高扬. 304不锈钢敏化热处理对耐蚀性的影响[J]. 化工机械,1995,22(2):87-90.
【10】曲炎淼,黄峰,刘静,等. 不同组织X80钢点蚀电化学行为研究[C]//第五届全国腐蚀大会论文集,[s.n.]:[s.L.],2009:1-5.
【11】梁明华,赵国仙,冯耀荣,等. 22Cr双相不锈钢的临界点蚀温度研究[J]. 腐蚀科学与防护技术,2005,17(6):392-394.
【12】BROLI A,HOLTAN H. Kinetics for pitting corrosion of a 13Cr steel in neutral chloride solution[J]. Werkstoffe and Korrosion,1976,26:497-504.
【13】YIN Z F,ZHAO W Z,TIAN W,et al. Pitting behavior on super 13Cr stainless steel in 3.5% NaCl solution in the presence of acetic acid[J]. Solid State Electrochem,2009,13:1291-1296.
【14】王梅丰,杜楠,李晓刚,等. 激光电子散斑干涉技术监测1Cr18Ni9Ti不锈钢在氯化钠溶液中的早期点蚀行为[J]. 腐蚀与防护,2009,30(1):29-31.
【15】曹楚南. 电化学阻抗谱导论[M]. 北京:科学出版社,2002:190-194.
【16】曹楚南. 腐蚀电化学原理(第二版)[M]. 北京:化学工业出版社,2004:196-201.
【17】NAGARAJAN S,RAMAN V,RAJENDRAN N. Evaluation of passive film behaviour of super austenitic steels at different potential regions using dynamic electrochemical impedance spectroscopy[J]. Journal of Solid State Electrochemistry,2010,14(7):1197-1204.
【18】MURRAY J N, HACK H P. Long-time testing of expoxy-coating steel in ASTM seawater using electrochemical impedance spectroscopy[J]. Corrosion,1991,47(6):480-489．预祝广大读者、作者元旦快乐！
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