测量不锈钢电化学噪声的非对称表面方法

doi:10.11902/1005.4537.2023.129

中国腐蚀与防护学报

2023, Vol. 43

Issue (5): 1151-1158 CSTR: 32134.14.1005.4537.2023.129 DOI: 10.11902/1005.4537.2023.129

海洋材料腐蚀与防护及钢筋混凝土耐久性与设施服役安全专栏

本期目录 | 过刊浏览

测量不锈钢电化学噪声的非对称表面方法

刘微(

)

宁夏师范学院物理与电子信息工程学院固原 756000

Asymmetric Surface Configuration for Electrochemical Noise Measurement on Stainless Steel

LIU Wei(

)

School of Physics and Electronic Information Engineering, Ningxia Normal University, Guyuan 756000, China

全文: PDF(3847 KB) HTML

摘要:

提出一种基于同种材料不同表面处理的电极配对模式，采集非对称EN时域信号，主要反映单个电极的局部腐蚀扩展动态，从而拓展EN测量在不锈钢点蚀传播过程中的应用。结合EN与各个电极腐蚀电位的交替测量，提供各电极表面状态随浸泡时间的不同发展趋势的证据。研究结果有望提供一种EN测量局部腐蚀扩展过程的新模式，并建立EN信号与单电极上电化学腐蚀过程对应的电化学暂态模型，为测量、分析及预测钝性工程合金在海水中的局部腐蚀行为提供新的思路。

关键词 ：不锈钢, 点蚀, 电化学噪声, 非对称电极, 交互递归分析

Abstract：

An electrode pairing mode based on different surface treatments of the same material is proposed in this paper to collect the asymmetric EN signal in the time domain, which might mainly reflect the local corrosion propagation kinetics of one electrode, to expand the application of the EN measurement in the pitting propagation process of stainless steel. Combining the alternant measurement of the EN and the corrosion potential of the respective electrode, the evidence of the different development of each electrode surface state during immersion was provided. The results are expected to provide a new EN measurement configuration for detecting the local corrosion propagation, and establish a transient electrochemical model corresponding to the localized corrosion on one electrode, which provides a new approach for measuring, analyzing, and predicting the local corrosion behavior of the passive engineering alloys in the seawater.

Key words： stainless steel pitting corrosion electrochemical noise asymmetrical electrodes cross recurrence analysis

收稿日期: 2023-04-28 32134.14.1005.4537.2023.129

ZTFLH:

TG174

基金资助:宁夏重点研发计划项目(2019BEB04012)

通讯作者: 刘微，E-mail: liuwei_0043@163.com，研究方向为金属腐蚀电化学分析

Corresponding author: LIU Wei, E-mail: Liuwei_0043@163.com

作者简介: 刘微，男，1981年生，博士，副教授

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引用本文:

刘微. 测量不锈钢电化学噪声的非对称表面方法[J]. 中国腐蚀与防护学报, 2023, 43(5): 1151-1158.
LIU Wei. Asymmetric Surface Configuration for Electrochemical Noise Measurement on Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2023, 43(5): 1151-1158.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2023.129 或 https://www.jcscp.org/CN/Y2023/V43/I5/1151

图1 单个电极上形成点蚀生长电流暂态的等效电路模型

图2 304不锈钢钝化-钝化电极对、抛光-抛光电极对、抛光-钝化电极对在3.5%NaCl溶液浸泡24 h的EN时域信号，及其开端和末尾时段的细节

图3 图2所示ECN信号经小波分析得到的部分信号标准偏差(SDPS)最大值对应的晶体序号，及相应的SDPS值

图4 304不锈钢抛光/钝化处理电极在3.5%NaCl溶液中的动电位阴极极化曲线

图5 304不锈钢抛光-钝化电极对在3.5%NaCl中浸泡24 h末尾10 min EPN信号、及随后分别测量的抛光、钝化电极开路电位变化

图6 304不锈钢抛光-钝化电极对在3.5%NaCl溶液中浸泡不同时段真实阳极电流暂态ia的估计值、ECN测量值及表观阴极电流值ic的形态

图7 304不锈钢抛光-钝化电极采集的ECN-EPN信号及估计阳极电流ia-EPN的交互递归定量参数随时间的演变

图8 304不锈钢抛光-钝化电极对在不同时段的ECN-EPN信号、估计阳极电流ia-EPN信号的交互递归图

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