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中国腐蚀与防护学报  2002, Vol. 22 Issue (5): 290-294     
  研究报告 本期目录 | 过刊浏览 |
16Mn钢局部腐蚀中的电化学噪声特征
董泽华;郭兴蓬;郑家shen
武汉华中科技大学化学系
FEATURES OF ECN OF LOCALIZED CORROSION FOR 16Mn STEEL
Zehua Dong;Xingpeng Guo;Jiashen Zheng
武汉华中科技大学化学系
全文: PDF(146 KB)  
摘要: 通过测量16Mn钢在01 mol/LCl-+05 mol/L HCO-3 溶液中的电化学噪声,发现在点蚀诱导期,亚稳态蚀点的形核速率λ不到0002 s -1,噪声电流峰平均宽约3~5 s,而噪声电位峰却平均宽达200 s;在点蚀从亚稳态转变 为稳态过程中,λ急剧增加,且电流噪声峰宽度也开始增加,但电位峰宽度却开始减小 .随着局部腐蚀进入稳定发展期,噪声中出现了大尺度的波动,且噪声电位峰与电流峰宽度 基本相等,但λ却有所下降.宏观点蚀的出现导致噪声电阻Rn迅速下降,并在腐 蚀进入稳定发展期后逐渐趋于稳定.
关键词 16Mn钢局部腐蚀电化学噪声形核速率噪声    
Abstract:The change of electrochemical noise(ECN)patterns wi th time of 16Mn steel in 0.1 mol/L Cl-+0.5 mol/L NaHCO3 solution was inv es tigated.The experimental result showed,during metastable pit initiation period,t he pitting initiation rate λ was less than 0.002 s-1,and the average life time of current transient coupled in ECN was about 3~5 s.However,the average li fetime of potential transient was 200 s.During the transition from metastable to stable pitting,λ increased rapidly,with an increase of the lifetime of current transient and a decrease of potential transient.Then,during the stable developm ent of pitting corrosion,the lifetime of current and potential transient become almost identical,and a large-scaled fluctuation in ECN as well as a decrease of λ was observed.In addition,during the transition from metastable to stable pitt ing,noise resistance Rn decreased fast,and Rn get stable once the st abilization of pitting corrosion.
Key words16Mn steel    localized corrosion    electrochemical noise    i nitiation rate    noise resistance
收稿日期: 2001-03-05     
ZTFLH:  TG174  
通讯作者: 董泽华   
Corresponding author: Zehua Dong   

引用本文:

董泽华; 郭兴蓬; 郑家shen . 16Mn钢局部腐蚀中的电化学噪声特征[J]. 中国腐蚀与防护学报, 2002, 22(5): 290-294 .
Zehua Dong, Xingpeng Guo, Jiashen Zheng. FEATURES OF ECN OF LOCALIZED CORROSION FOR 16Mn STEEL. J Chin Soc Corr Pro, 2002, 22(5): 290-294 .

链接本文:

https://www.jcscp.org/CN/      或      https://www.jcscp.org/CN/Y2002/V22/I5/290

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