表面粗糙度对硝酸钝化304不锈钢点蚀行为影响
Influence of Surface Roughness on Pitting Corrosion Behaviors of 304 Stainless Steel Passivated with Nitric Acid
摘 要
采用动电位扫描、电化学阻抗谱和电化学噪声等方法研究了不同表面粗糙度的304不锈钢在体积分数10% HNO3溶液中钝化后的耐蚀性。结果表明, 随304不锈钢钝化前表面粗糙度从0.25 μm降到0.10 μm, 电荷转移电阻从6.51 kΩ·cm2上升到19.17 kΩ·cm2, 电位标准偏差和电流标准偏差降低, 而噪声电阻增大; 随表面粗糙度的增大, 试样电位和电流的功率密度曲线线性部分的斜率均出现增大, 谱噪声曲线线性部分的斜率下降, 表明在光滑的不锈钢表面更容易形成致密稳定且耐腐蚀性强的氧化膜, 硝酸钝化能显著改善304不锈钢耐点蚀性能。
点腐蚀
动电位扫描
电化学噪声
电化学阻抗谱
304 stainless steel
pitting corrosion
potentiodynamic scan
electrochemical noise
electrochemical impedance spectroscopy
Abstract
After passivation in 10vol% HNO3 solution, the corrosion resistance of 304 stainless steel samples with different surface roughnesses were studied with potentiodynamic scan, electrochemical impedance spectroscopy (EIS) and electrochemical noise (EN). The results show that when the surface roughness decreased from 0.25 μm to 0.1 μm, the charge-transfer resistance raised from 6.51 kΩ·cm2 to 19.17 kΩ·cm2, current standard deviation and potential standard deviation decreased, but noise resistance increased. The slopes of line segment in power spectral density (PSD) curves of potential and current increased, but the slope of noise spectrum curve decreased with the increase of surface roughnesses of samples, indicating that compact and stable passivation film was easily formed on the smooth surface of stainless steel. HNO3 passivation could markedly improve the pitting corrosion resistance of 304 stainless steel.
中图分类号 TG174 DOI 10.11973/fsyfh-201512010
所属栏目 试验研究
基金项目 佛山市科技计划项目(2014AG10009); 佛山市高明区产学研项目(201205)
收稿日期 2015/4/2
修改稿日期
网络出版日期
作者单位点击查看
联系人作者陈东初(cdcever@163.com)
备注陈东初(1972-), 教授, 博士, 从事材料表面与应用电化学研究,
引用该论文: WANG Mei-feng,WEI Hong-yang,CHEN Dong-chu,WAN Bin,NI Lei,LIU Gui-hong,LI Guang-dong. Influence of Surface Roughness on Pitting Corrosion Behaviors of 304 Stainless Steel Passivated with Nitric Acid[J]. Corrosion & Protection, 2015, 36(12): 1156
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参考文献
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【2】陆世英,张延凯. 不锈钢[M]. 北京:原子能出版社,1995:1-2.
【3】YING D Y. Application and application requirement of stainless steel in petrochemical industry[J]. Proc Equip Piping,2002,39(6):46-47.
【4】诸震鸣. 谈谈不锈钢硝酸钝化法[J]. 电镀与精饰,1997,19(4):37-41.
【5】王玮,赵吉庆,张启富. 000Cr25Ni20奥氏体不锈钢在硝酸溶液中的腐蚀电化学行为[J]. 腐蚀与防护,2010,31(12):939-943.
【6】桂艳,高岩. 不锈钢表面钝化膜特性的研究进展[J]. 特殊钢,2011,32(3):20-34.
【7】GB/T 17899-1999 不锈钢点蚀电位测量方法[S].
【8】曹楚南,张鉴清. 电化学阻抗谱导论[M]. 北京: 科学出版社, 2002.
【9】BERTOCCI U,HUET F. Noise analysis applied to electrochemical system[J]. Corrosion,1995,51(2):131-144.
【10】IVERSON W P. Transient voltage changes produced in corroding metals and alloys[J]. J Electrochem Soc,1968,115:617-618.
【11】ZHANG T,SHAO Y W,MENG G Z,et al. Electrochemical noise analysis of the corrosion of AZ91D magnesium alloy in alkaline chloride solution[J]. Electrochim Acta,2007,53:561-568.
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