Microconstituent-induced pitting corrosion in aluminum alloy 2024-T3

被引：353

作者：

Chen, GS ^{[1
]}

Gao, M ^{[1
]}

Wei, RP ^{[1
]}

机构：

[1] LEHIGH UNIV,DEPT MECH ENGN & MECH,BETHLEHEM,PA 18015

来源：

CORROSION | 1996年 / 52卷 / 01期

关键词：

Al; 2024; aqueous environments; constituent particles; localized corrosion; microconstituents; pH; pitting corrosion; sodium chloride solutions;

D O I：

10.5006/1.3292099

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Free corrosion immersion experiments were conducted on a commercial airframe material AL 2024-T3 (UNS A92024, in 0.5 M sodium chloride (NaCl) solution to investigate the role of microconstituents in pitting corrosion The alloy was found to contain numerous constituent particles (> 300,000 per cm(2) (> 2 million per in.(2)]), and pitting corrosion essentially was attributable to these particles. True types of constituent particles were identified Each type played a different role in inducing pitting corrosion Particles containing Al Cu, Fe, and Mn acted as cathodes and promoted matrix dissolution at their periphery. Particles containing Al, Cu, and Mg showed anodic behavior and dissolved with preferential dissolution of Mg and Al. If was evident that individual particle-nucleated pits coalesced laterally and in depth to form larger pits. Tests conducted in deionized water indicated that only the Al-Cu-Mg-containing particles dissolved to produce localized corrosion damage at the surface, Microconstituent-induced pitting was found to depend upon solution pH.

引用

页码：8 / 15

页数：8

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