Comparison of single and multilayer coatings based on ormosil and conversion layers for aluminum alloy corrosion inhibition

被引：21

作者：

Kachurina, O ^{[1
]}

Metroke, TL ^{[1
]}

Stesikova, E ^{[1
]}

Knobbe, ET ^{[1
]}

机构：

[1] Oklahoma State Univ, Inst Environm, Stillwater, OK 74078 USA

来源：

JOURNAL OF COATINGS TECHNOLOGY | 2002年 / 74卷 / 926期

关键词：

D O I：

10.1007/BF02720159

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Corrosion resistance behavior of single and multilayer coatings based on ormosil, trivalent chromium conversion coating (tccc) and hexavalent chromium conversion coatings (hccc) on the surface of 2024-T3 aluminum alloy (AA) was investigated using potentiodynamic polarization curves and accelerated salt spray testing. The magnitude of the corrosion resistance for single layer coatings increased tccc < ormosil < hccc. Multilayer ormosil/ormosil coatings are subject to phase separation, leading to poor performance in the electrochemical and accelerated salt spray testing. The presence of either hccc or tccc in the multilayer film was found of the ormosil barrier film. Multilayer coatings composed of either tccc/ormosil or hccc/ormosil were found to exhibit R-corr values in the range 158-177 kOmegacm(2). This implies that the environmentally-benign and nontoxic trivalent chromium conversion coating used in combination with an ormosil film may be a potential alternative for hexavalent chromium conversion coatings.

引用

页码：43 / 48

页数：6

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