Study of the corrosion mechanism of the in situ grown Mg-Al-CO32- hydrotalcite film on AZ31 alloy

被引：93

作者：

Chen, Jun ^{[1
]}

Song, Yingwei ^{[1
]}

Shan, Dayong ^{[1
]}

Han, En-Hou ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Met Res, State Key Lab Corros & Protect, Shenyang 110016, Peoples R China

来源：

CORROSION SCIENCE | 2012年 / 65卷

基金：

对外科技合作项目（国际科技项目）; 中国国家自然科学基金;

关键词：

Magnesium; EIS; XPS; XRD; Passive films; LAYERED DOUBLE HYDROXIDE; CONVERSION FILM; ANION-EXCHANGE; MAGNESIUM ALLOY; MG ALLOY; ION; CRYSTALLIZATION; IMMOBILIZATION; DELAMINATION; RESISTANCE;

D O I：

10.1016/j.corsci.2012.08.026

中图分类号：

T [工业技术];

学科分类号：

120111 [工业工程];

摘要：

The corrosion mechanism of Mg-Al-CO32- hydrotalcite film is discussed based on its corrosion behavior and the anion-exchange or adsorption effect of Cl-. The results demonstrate that the film is very compact and acts as a barrier against Cl- attack in the early stage. Then the surface of the film is dissolved gradually due to its instability in aqueous solutions. Only after eliminating CO32-, Cl- can insert into the hydrotalcite interlayer to balance charges. Cl- cannot substitute CO32- just in NaCl solution, but can adsorb on active spots of the film to accelerate the decomposition. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：268 / 277

页数：10

共 42 条

[1]

Analysis of the electrochemical reaction behavior of alloy AZ91 by EIS technique in H3PO4/KOH buffered K2SO4 solutions [J].