304不锈钢点蚀的电化学噪声特征

中国腐蚀与防护学报

2012, Vol. 32

Issue (3): 235-240

研究报告

本期目录 | 过刊浏览

304不锈钢点蚀的电化学噪声特征

李季,赵林,李博文,郑丽群,韩恩厚

中国科学院金属研究所环境腐蚀中心，沈阳 110016

ELECTROCHEMICAL NOISE ANALYSIS OF 304 STAINLESS STEEL PITTING CORROSION IN FERRIC CHLORIDE SOLUTION

LI Ji, ZHAO Lin, LI Bowen,ZHENG Liqun, HAN En-Hou

Environmental Corrosion Research Center,Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016

全文: PDF(1283 KB)

摘要: 使用电化学噪声技术，通过长期连续实时监测，对304不锈钢在0.5mol/L FeCl₃溶液中发生局部腐蚀的点蚀发展过程和腐蚀机理进行研究。综合谱图分析、时域统计分析、小波分析等诸多方法进行分析和论证。结果表明：电化学噪声的谱图可以明显地分为4个阶段，分别对应于点蚀发展过程中的钝态期、亚稳态点蚀期、稳态点蚀期及稳态点蚀后期。在时域分析时，先用3阶多项式拟合移除漂移，电流噪声标准偏差Si在亚稳蚀和稳态点蚀阶段发生明显的升高，噪声电阻(R_n)、点蚀指标(PI)在对应时间点表现出相应的降低或升高。小波分析表明，随着反应的进行，能量积累开始逐步增大；亚稳态点蚀期能量开始向d4~d6处累积，当进一步发展为稳态点蚀时d5~d8出现极大值。

关键词 ： 304不锈钢, 点蚀, 电化学噪声

Abstract：The localized corrosion behavior of 304 stainless steel immersed in 0.5 mol/L FeCl₃ solution was investigated for a long-term monitoring as long as 350 h by electrochemical noise (EN) technique. The EN data was analyzed mainly by spectrum analysis, time-domain statistical analysis and wavelet transform. The whole process can be divided into four parts, which can be differentiated clearly according to the characteristic EN transient peaks. The variations of current standard deviation, R_n and PI during the whole monitoring period all give the coincident result. The 3D energy distribution plots(EDP) give the energy contribution of each detail crystals during the whole monitoring time. The figure which only concerns contribution of detail crystals shows that, the energy accumulation in band d4~d6 increases with the metastable pits occurrence. And as this process stepped into stable pitting stage, a max of the energy contribution occurs during the band d5~d8.

Key words： 304 stainless steel pitting corrosion electrochemical noise(EN)

收稿日期: 2011-05-22

ZTFLH:

TG174.3

通讯作者: 赵林 E-mail: zhaolin@imr.ac.cn

Corresponding author: ZHAO Lin E-mail: zhaolin@imr.ac.cn

作者简介: 李季，女，1985年生，硕士生，研究方向为腐蚀电化学

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引用本文:

李季,赵林,李博文,郑丽群,韩恩厚. 304不锈钢点蚀的电化学噪声特征[J]. 中国腐蚀与防护学报, 2012, 32(3): 235-240.
LI Ji, DIAO Lin, LI Bo-Wen, ZHENG Li-Qun, HAN En-Hou. ELECTROCHEMICAL NOISE ANALYSIS OF 304 STAINLESS STEEL PITTING CORROSION IN FERRIC CHLORIDE SOLUTION. J Chin Soc Corr Pro, 2012, 32(3): 235-240.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y2012/V32/I3/235

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