基于散粒噪声理论分析锌合金（ZnAl4Cul）在干湿循环下的腐蚀行为（英文）

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Bibliographic Details
Published in中国有色金属学报：英文版 Vol. 22; no. 1; pp. 228 - 240
Main Author 陈安娜 曹发和 刘文娟 郑利云 张昭 张鉴清 曹楚南
Format Journal Article
LanguageEnglish
Published 2012
Subjects
干湿循环
散粒噪声分析
电化学噪声
锌合金
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Bibliography:electrochemical noise; shot noise analysis; dry-wet cycle; zinc alloy
The corrosion behaviors of zinc alloy （ZnAl4Cul） in 3.5% （mass fraction） NaCl, 7.3% （mass fraction） Na2SO4 and simulated acid rain solutions were investigated using electrochemical measurements. The potential noise during dry-wet cycle was monitored and analyzed by fast Fourier transform （FFT）, fast wavelet transform （FWT）, shot noise theory and stochastic theory. Cumulative probability curves of event frequency fn indicate that the corrosion events in the dry cycles are greater than those in the wet cycles. Uniform corrosion was observed in the NaCl solution compared with more localized corrosion in the Na2SO4 solution, which is evidenced by FWT and SEM. Conditional events generation rate r（t） for diffusion controlled reactions decreases with increasing the time. r（t） values for uniform corrosion and diffusion controlled process are the largest in the wet cycle in 3.5% NaCl solution. The values of r（t） for pitting corrosion in Na2SO4 solution are observed to become large during spraying periods, and r（t） for pitting corrosion has the largest value in the Na2SO4 solution. The intergranular corrosion of zinc is serious in simulated acid rain solution.
CHEN An-na1, CAO Fa-he1, LIU Wen-juan1, ZHENG Li-yun1, ZHANG Zhao1, ZHANG Jian-qing1, 2, CAO Chu-nan1, 2 1. Department of Chemistry, Zhejiang University, Hangzhou 310027, China; 2. State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
43-1239/TG
ISSN:1003-6326