Chaos analysis of electrochemical noise and its application in localized corrosion detection

doi:10.11949/j.issn.0438-1157.20170816

Abstract

Abstract:

The chaos theory was used to analyze electrochemical noise (EN) data for corrosion detection during coating degradation and stress corrosion cracking (SCC) process and insightful results were achieved by correlation dimensional characterization of localized corrosion. Analysis of electrochemical potential noise (EPN) during corrosion degradation of novolac epoxy coated on tinplate indicated that number of correlation dimensions corresponding to EPN tended to increase as localized corrosion accelerated. In addition, chaos phase space reconstruction was employed to analyze stress corrosion EN of 304 stainless steel (SS) and to characterize SCC process via correlation dimensions. The results showed that phase space trajectory resembled spherical shape in the initial SCC stage and then changed to elliptical shape in the later SCC stage. The increase of correlation dimension during crack initiation and propagation revealed increment in uncertainty and complexity of EN signals.

Key words: corrosion, electrochemistry, chaos, electrochemical noise, organic coating degradation, stress corrosion cracking, localized corrosion

摘要：

将混沌理论引入电化学噪声（EN）谱的数据解析，对有机涂层失效过程和应力腐蚀过程的EN数据进行分析，采用关联维数表征局部腐蚀过程，取得了一些有意义的结果。分析了环氧酚醛/镀锡薄钢板失效过程的EN特征，通过计算涂覆镀锡薄钢板腐蚀过程的电化学电位噪声（EPN）谱特征，发现EPN对应的关联维数值随着局部腐蚀程度的加剧有增加的趋势。采用混沌相空间重构理论分析了304不锈钢应力腐蚀过程的电流噪声谱，利用关联维数表征应力腐蚀过程。数据计算结果表明应力腐蚀初期其相空间轨迹呈圆球形，应力腐蚀后期则变为椭圆形。研究结果表明，当裂纹萌生和扩展时，关联维数值增大，表明电化学噪声信号的不确定性与复杂性增加。

关键词: 腐蚀, 电化学, 混沌, 电化学噪声, 涂层实效, 应力腐蚀开裂, 局部腐蚀

CLC Number:

TG174.21

XIA Dahai, SONG Shizhe, WANG Jihui. Chaos analysis of electrochemical noise and its application in localized corrosion detection[J]. CIESC Journal, 2018, 69(4): 1569-1577.

夏大海, 宋诗哲, 王吉会. 基于混沌理论的电化学噪声谱数据解析及其在局部腐蚀检测中的应用[J]. 化工学报, 2018, 69(4): 1569-1577.

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