X80钢在0.5 mol/L NaCl溶液中的交流电流腐蚀行为
Alternating Current Corrosion Behavior of X80 Steel in 0.5 mol/L NaCl Solution
摘 要
采用极化曲线、电化学阻抗谱(EIS)、金相显微镜等方法, 研究了不同交流电流密度作用下X80钢在0.5 mol/L NaCl溶液中的腐蚀行为。结果表明,随着交流电流密度的升高, X80在NaCl溶液中的腐蚀电位均较负, 腐蚀电流密度出现波动, 阳、阴极Tafel斜率的比值出现大幅度变化, 极化电阻和低频区阻抗模值也均出现波动; X80钢表面出现越来越多的大点蚀坑及分布较均匀的小点蚀坑, 局部腐蚀严重。
交流电流密度
氯离子
腐蚀
X80
alternating current density
chloride ion
corrosion
Abstract
The corrosion behavior of X80 steel in solution 0.5 mol/L NaCl solution with alternating current was investigated by polarization curve, electrochemical impedance spectroscopy (EIS), optical microscopy, etc. The results showed that: as AC current density increased, i) the corrosion potentials of X80 in NaCl solution were relatively negative, and the corrosion current densities and values of polarization resistance and impedance modulus fluctuated, while the anodic-to-cathodic Tafel slope radio exhibited drastic changes; ii) X80 steel surface in NaCl solution exhibited more and more large pits and more uniform distribution of small pits, localized corrosion being more serious.
中图分类号 TG174 DOI 10.11973/fsyfh-201508008
所属栏目 试验研究
基金项目 中石油集团公司工程建设分公司项目(2011GJTC-01-03)
收稿日期 2014/8/25
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备注吴红梅(1987-),硕士研究生,从事材料的腐蚀与防护研究,
引用该论文: WANG Xia,ZHANG Peng,WANG Fei,WU Hong-mei. Alternating Current Corrosion Behavior of X80 Steel in 0.5 mol/L NaCl Solution[J]. Corrosion & Protection, 2015, 36(8): 731
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参考文献
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【2】DD CEN/15280-2006Evaluation of a.c. corrosion likehood of buried pipelines-application to cathodically protected pipelines[S].
【3】CHIN D T,FU T W. Corrosion by alternating current: A study of the anodic polarization of mild steel in Na2SO4 solution[J]. Corrosion,1979,35(11): 514-523.
【4】董亮,路民旭,杜艳霞,等. 埋地管道交流腐蚀的研究进展[J]. 中国腐蚀与防护学报,2011,31(3): 173-176.
【5】魏宝明. 金属腐蚀理论及应用[M]. 北京: 化学工业出版社,2008.
【6】费小丹,李明齐,许红梅,等. 湿度对X70钢在卵石黄泥土中腐蚀行为影响的电化学研究[J]. 腐蚀科学与防护技术,2007,19(1): 35.
【7】XU C M,ZHANG Y H,CHENG G X,et al. Pitting corrosion behavior of 316L stainless steel in the media of sulphate-reducing and iron-oxidizing bacteria[J]. Materials Characterization,2008,59(3): 245.
【8】HAMADOU L,KADRI A,BENBRAHIM N. Characterisation of passive films formed on low carbon steel in borate buffer solution by electrochemical impedance spectroscopy[J]. Applied Surface Science,2005,252(5): 1510.
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