The cathodic dissolution of Al, Al2Cu, and Al alloys

被引：54
|
作者：
Ogle, K. [1 ]
Serdechnova, M. [1 ]
Mokaddem, M. [1 ]
Volovitch, P. [1 ]
机构：
[1] ParisTech, Ecole Natl Super Chim Paris, F-75005 Paris, France
来源：
ELECTROCHIMICA ACTA | 2011年 / 56卷 / 04期
关键词：
Aluminum; Alloys; Intermetallics; Passive film; Spectroelectrochemistry; ATOMIC-EMISSION SPECTROELECTROCHEMISTRY; DIFFUSION-COEFFICIENT; ANODIC-DISSOLUTION; ALUMINUM; CORROSION; POLARIZATION; PHASES; FILMS;
D O I：
10.1016/j.electacta.2010.09.058
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The cathodic dissolution of aluminum has been investigated for 99.99% Al, synthetic Al2Cu. and three Al-Cu-Mg alloys: AA2024, AA7050, and AA2214 offering a range of over two orders of magnitude in hydrogen reduction activity. Atomic emission spectroelectrochemistry (AESEC) was used to directly measure the dissolution rate of the alloy components as a function of the cathodic current during potential sweep and potential step experiments. It was found that for all samples, regardless of the cathodic current density, the stoichiometric ratio of OH produced to Al dissolved varied between 1.4 and 1.8. This value is interpreted in terms of a simple model in which hydroxide generation. Al(OH)(3) formation/dissolution, and Al(OH)(4)(-) diffusion are kinetically coupled together. The selective dissolution of Mg and Cu is also measured and discussed. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：1711 / 1718
页数：8
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