Effect of acid traces on hydrothermal sealing of anodising layers on 2024 aluminium alloy

被引：58
|
作者：
Arenas, M. A. [1 ]
Conde, A. [1 ]
de Damborenea, J. J. [1 ]
机构：
[1] Ctr Nacl Invest Met CENIM CSIC, Dept Corros & Protecc, Madrid 28040, Spain
来源：
ELECTROCHIMICA ACTA | 2010年 / 55卷 / 28期
关键词：
Tartaric acid anodising; Sealing process; Tartrates; 2024 aluminium alloy; Corrosion; IMPEDANCE MEASUREMENTS; OXIDE FILMS; MOLYBDATE;
D O I：
10.1016/j.electacta.2010.07.089
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The corrosion properties of hydrothermally sealed anodised 2024 aluminium alloy specimens in tartaric-sulphuric acid (TSA) and sulphuric acid (SA) are investigated using electrochemical techniques A new mechanism is proposed to describe the improvements observed for the sealed porous layer grown in the mixed electrolyte This mechanism involves the dissociation of the residual organic acid present inside the pores as a consequence of the pH increase during hydrothermal sealing (HT) Tartrate ions form chelate complexes with Cu(II) cations embedded in the oxide film This results in a decrease in the heterogeneity of the film and consequently better protective properties (C) 2010 Elsevier Ltd All rights reserved
引用
收藏
页码：8704 / 8708
页数：5
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