Effect of intermetallic phases on the anodic oxidation and corrosion of 5A06 aluminum alloy

被引：38

作者：

Li, Song-mei ^{[1
]}

Li, Ying-dong ^{[1
]}

Zhang, You ^{[1
]}

Liu, Jian-hua ^{[1
]}

Yu, Mei ^{[1
]}

机构：

[1] Beihang Univ, Sch Mat Sci & Engn, Beijing 100191, Peoples R China

来源：

INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS | 2015年 / 22卷 / 02期

基金：

中国国家自然科学基金;

关键词：

aluminum alloys; intermetallic particles; anodic oxidation; corrosion; protective films; PERCENT CU ALLOY; AL-MG ALLOY; LOCALIZED CORROSION; FILM GROWTH; S-PHASE; BEHAVIOR; ACID; MICROSTRUCTURE; CHLORIDE; AA5083;

D O I：

10.1007/s12613-015-1057-3

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Intermetallic phases were found to influence the anodic oxidation and corrosion behavior of 5A06 aluminum alloy. Scattered intermetallic particles were examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) after pretreatment. The anodic film was investigated by transmission electron microscopy (TEM), and its corrosion resistance was analyzed by electrochemical impedance spectroscopy (EIS) and Tafel polarization in NaCl solution. The results show that the size of Al-Fe-Mg-Mn particles gradually decreases with the iron content. During anodizing, these intermetallic particles are gradually dissolved, leading to the complex porosity in the anodic film beneath the particles. After anodizing, the residual particles are mainly silicon-containing phases, which are embedded in the anodic film. Electrochemical measurements indicate that the porous anodic film layer is easily penetrated, and the barrier plays a dominant role in the overall protection. Meanwhile, self-healing behavior is observed during the long immersion time.

引用

页码：167 / 174

页数：8

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