Metastable pitting characteristics of aluminium alloys measured using current transients during potentiostatic polarisation

被引：128

作者：

Gupta, R. K. ^{[1
]}

Sukiman, N. L. ^{[2
]}

Cavanaugh, M. K. ^{[1
]}

Hinton, B. R. W. ^{[1
]}

Hutchinson, C. R. ^{[1
,2
]}

Birbilis, N. ^{[1
,2
]}

机构：

[1] Monash Univ, Dept Mat Engn, Clayton, Vic 3800, Australia

[2] Monash Univ, ARC Ctr Excellence Design Light Met, Clayton, Vic 3800, Australia

来源：

ELECTROCHIMICA ACTA | 2012年 / 66卷

基金：

澳大利亚研究理事会;

关键词：

Aluminium alloys; Corrosion; Passivity; Metastable pitting; PIT INITIATION; CORROSION; CU; TRANSITION; GROWTH;

D O I：

10.1016/j.electacta.2012.01.090

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

In this study we report a comparison between the metastable pitting observed upon AA2024-T3, AA5005-H34, AA5083-H116, AA6022-O, AA7075-T651 and pure Al, over a range of potentials. Metastable pitting increased with microstructural (hence electrochemical) heterogeneity of the alloys studied, which roughly correlates with hardness. In alloys exhibiting a low pitting propensity, metastable pitting activity completely ceased as the undenpotential from E-pit was increased, whereas for corrosion prone alloys, metastable activity continued independently of underpotential. The selection of the test potential is also a key factor in using the method described herein. It is shown that the E-pit value bears little correlation with the number of pits formed during long-term exposure as measured using optical profilometry, whereas the metastable pitting rate bears a correlation to the actual pit density. (C) 2012 Elsevier Ltd. All rights reserved.

引用

页码：245 / 254

页数：10

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