Co-operative corrosion phenomena

被引：43

作者：

Hughes, A. ^{[1
]}

Muster, T. H. ^{[1
]}

Boag, A. ^{[2
]}

Glenn, A. M. ^{[3
]}

Luo, C. ^{[4
]}

Zhou, X. ^{[4
]}

Thompson, G. E. ^{[4
]}

McCulloch, D. ^{[2
]}

机构：

[1] Commonwealth Sci & Ind Res Org, Div Mfg & Mat Technol, Clayton, Vic 3169, Australia

[2] RMIT Univ, Dept Appl Phys, Melbourne, Vic, Australia

[3] CSIRO Div Minerals, Clayton, Vic 3169, Australia

[4] Univ Manchester, Sch Mat, Ctr Corros & Protect, Manchester M60 1QD, Lancs, England

来源：

CORROSION SCIENCE | 2010年 / 52卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

Aluminium alloy; Intermetallics; Intermetallic clustering; Pitting corrosion; Stable pitting; LASER-SCANNING MICROSCOPY; LOCALIZED CORROSION; ALUMINUM-ALLOY; PARTICLES; METROLOGY;

D O I：

10.1016/j.corsci.2009.10.021

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion of aluminium alloy 2024-T3 (AA2024-T3) was studied as a function of immersion time from 2.5 to 120 min in 0.1 M aqueous NaCl solution. At immersion times as short as 5 min, rings of corrosion product of 100 to 200 mu m diameter, containing smaller domes of corrosion product, were observed using SEM. The domes of corrosion product had greater chloride concentrations than elsewhere on the surface and represented sites of anodic attack. As the immersion time was increased, significant grain boundary attack was observed within the rings of corrosion product. Analyses of Particle Induced Xray Emission (PIXE) maps of the corroded surfaces showed a significantly higher number of IM particles around the chloride attack sites than the average particle density for the maps, indicating clustering of IM particles. These results suggest a co-operative corrosion effect as a result of clustering of the IM particles. A mechanism for the generation of the corrosion rings is discussed. Crown Copyright (C) 2009 Published by Elsevier Ltd. All rights reserved.

引用

页码：665 / 668

页数：4

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