Electrochemical noise characteristics in corrosion process of AZ91D magnesium alloy in neutral chloride solution

被引：21

作者：

Zhang Li-jun ^{[1
,2
]}

Zhu Xu-bei ^{[3
]}

Zhang Zhao ^{[1
,4
]}

Zhang Jian-qing ^{[1
]}

机构：

[1] Zhejiang Univ, Dept Chem, Hangzhou 310027, Peoples R China

[2] Zhejiang Forestry Univ, Coll Sci, Dept Chem, Hangzhou 311300, Zhejiang, Peoples R China

[3] Zhejiang Univ Technol, Coll Chem Engn & Mat Sci, Hangzhou 310032, Zhejiang, Peoples R China

[4] Educ Minist China, Key Lab Ultra Light Mat & Surface Treatment Techn, Harbin 150001, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2009年 / 19卷 / 02期

基金：

中国国家自然科学基金;

关键词：

AZ91D magnesium; corrosion; electrochemical noise; fractal dimension; ATMOSPHERIC CORROSION; BEHAVIOR; STEEL; RESISTANCE; COATINGS;

D O I：

10.1016/S1003-6326(08)60302-7

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The corrosion process of AZ91D magnesium alloy in neutral 1% (mass fraction) sodium chloride aqueous solution was investigated by electrochemical noise(EN), SEM and EDX. Fractal theory was primarily used to depict the corrosion process of the alloy. The fast wavelet transform(FWT), as well as the fast Fourier transform(FFT), was employed to analyze the EN data. The results show that the overall corrosion process can be described by three stages. The first stage corresponds to the pit nucleation and growth; the second stage involves the growth of a passive oxide layer; and the third stage involves reactivation. With increasing immersion time, fractal dimension increases fast initially, fluctuates in the medium and increases again at last. Pitting corrosion and fractal dimension increase due to the initiation and formation of pits in the initial and the end of immersion, while depresses due to the passivation in the medium period. The results of SEM and EDX support the above conclusions.

引用

页码：496 / 503

页数：8