Influence of pre-treatments in cerium conversion treatment of AA2024-T3 and 7075-T6 alloys

被引：53

作者：

de Frutos, A. ^{[1
]}

Arenas, M. A. ^{[1
]}

Liu, Y. ^{[2
]}

Skeldon, P. ^{[2
]}

Thompson, G. E. ^{[2
]}

De Damborenea, J. ^{[1
]}

Conde, A. ^{[1
]}

机构：

[1] CENIM CSIC, Dpto Corros & Protecc, Madrid 28040, Spain

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

来源：

SURFACE & COATINGS TECHNOLOGY | 2008年 / 202卷 / 16期

关键词：

aluminium; alloys; conversion treatment; cerium; pre-treatment; enriched layers;

D O I：

10.1016/j.surfcoat.2008.01.027

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The role of pre-treatment in the formation of a cerium conversion coating is investigated for the protection of AA2024-T3 and 7075-T6 alloys. The alloys were alkaline-etched and de-smutted in nitric acid, prior to cerium treatment in Ce(NO3)(3) at 85 degrees C with H2O2 accelerator. Potentiodynamic polarization studies in 3.5% NaCl solution revealed a large shift of similar to 300 mV of the corrosion potential below the pitting potential for the 7075-T6 alloy, which correlated with the development of a finely-textured, uniform coating. However, the formation of a uniform coating and protection was dependent upon the time of de-smutting, with non-uniform coatings resulting from extended times of de-smutting. In contrast, non-uniform coatings developed on the 2024-T3 alloy, with pitting potential at the corrosion potential, irrespective of the time of desmutting. Findings for the 2024-T3 alloy indicate that extended de-smutting affects the enrichment of alloying elements. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：3797 / 3807

页数：11

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