Composition of the corrosion products of galvanic alloys Zn-Co and their influence on the protective ability

被引：67

作者：

Boshkov, N

Petrov, K

Vitkova, S

Nemska, S

Raichevsky, G

机构：

[1] Bulgarian Acad Sci, Inst Phys Chem, Acad G Bonchev, BU-1113 Sofia, Bulgaria

[2] Bulgarian Acad Sci, Inst Inorgan Chem, Acad G Bonchev, BU-1113 Sofia, Bulgaria

来源：

SURFACE & COATINGS TECHNOLOGY | 2002年 / 157卷 / 2-3期

关键词：

corrosion; X-ray diffraction; scanning electron microscopy; photoelectron spectroscopy; zinc; zinc alloys;

D O I：

10.1016/S0257-8972(02)00161-5

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 [材料科学与工程]; 080502 [材料学];

摘要：

The composition of the corrosion products of non-chromated and chromated galvanic coatings of Zn and Zn-Co(1-5wt.%) alloys in free aerated solution of 5% NaCl is described and discussed. Corrosion treatment is realized at open circuit conditions for different periods of time. The corrosion products of monolayer galvanic coatings were investigated using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). As a result of the treatment the compound zinc hydroxide chloride monohydrat (ZHC)-Zn-5(OH)(8)Cl-2.H2O-was registered on Zn-Co alloys after the experimental period. ZHC supplementary increases the corrosion resistance due to its low solubility product and ensures better protection. In addition, the protective ability of mono- and bilayer galvanic systems (chromated and non-chromated) was determined using polarization resistance measurements. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：171 / 178

页数：8

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