Polishing-assisted galvanic corrosion in the dissimilar friction stir welded joint of AZ31 magnesium alloy to 2024 aluminum alloy

被引：101

作者：

Liu, C. ^{[1
]}

Chen, D. L. ^{[1
]}

Bhole, S. ^{[1
]}

Cao, X. ^{[2
]}

Jahazi, M. ^{[2
]}

机构：

[1] Ryerson Univ, Dept Mech & Ind Engn, Toronto, ON M5B 2K3, Canada

[2] Natl Res Council Canada, Inst Aerosp Res, Aerosp Mfg Technol Ctr, Montreal, PQ H3T 2B2, Canada

来源：

MATERIALS CHARACTERIZATION | 2009年 / 60卷 / 05期

基金：

加拿大创新基金会; 加拿大自然科学与工程研究理事会;

关键词：

Polishing; Dissimilar friction stir welding; Magnesium alloy; Aluminum alloy; Galvanic corrosion; AL; MICROSTRUCTURE; CRACKING;

D O I：

10.1016/j.matchar.2008.10.009

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Galvanic corrosion of a dissimilar friction stir welded 2024-T3 Al/AZ31B-H24 Mg joint prepared using a water-based and a non-water-based polishing solution was characterized. Microstructure and the distribution of chemical elements were analyzed using optical microscopy, scanning electron microscopy and energy dispersive X-ray spectroscopy. The stir zone polished using water-based solution was observed to be much more susceptible to galvanic corrosion attack than that obtained using non-water-based polishing solution. The location of corrosion attack was observed in the narrow regions of AZ31 Mg alloy adjacent to Al2024 regions in the stir zone. The occurrence of galvanic corrosion was due to the formation of Mg/Al galvanic couples with a small ratio of anode-to-cathode surface area. The corrosion product was primarily the porous magnesium hydroxide with characteristic microcracks and exhibited a low microhardness value. (C) 2008 Elsevier Inc. All rights reserved.

引用

页码：370 / 376

页数：7

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