Corrosion Investigations of Black Chromite Films on Zn and Zn-Co Coatings with Low Cobalt Content

被引：8

作者：

Boshkov, Nikolai ^{[1
]}

Boshkova, Neli ^{[1
]}

Bachvarov, Vasil ^{[1
]}

Peshova, Miglena ^{[1
]}

Lutov, Ludmil ^{[2
]}

机构：

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

[2] Univ Sofia, Fac Chem & Pharm, BU-1126 Sofia, Bulgaria

来源：

JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE | 2015年 / 24卷 / 12期

关键词：

corrosion; environmentally friendly conversion films; zinc; zinc alloys; CONVERSION COATINGS; ELECTRODEPOSITED ZINC; PROTECTION; BEHAVIOR; CHROMATE; REPLACEMENT; MORPHOLOGY; DEPOSITS; CHLORIDE; STEEL;

D O I：

10.1007/s11665-015-1794-5

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The corrosion resistance and protective ability of black-colored chromite (Cr3+ based) and chromium-free conversion films (CFs) on electrodeposited zinc and Zn-Co alloy coatings having low cobalt content in a neutral model medium of 3% NaCl solution have been investigated and characterized. Test methods such as polarization resistance measurements, scanning electron microscopy, EDS, x-ray diffraction analysis, and x-ray photoelectron spectroscopy analyses have been applied in order to scrutinize the actual protective characteristics of these films as well as to determine the composition of the corrosion products appearing as a result of the treatment in the corrosion medium. The experimental results revealed better protective characteristics, consequently superior performance of the electrodeposits with chromite films compared to these with chromium free or without any additional CF. The processes occurring on the sample's surface during the immersion in the chemical conversion solutions as well as the influence of the H3PO4 in the course of the treatment are also commented on and discussed.

引用

页码：4736 / 4745

页数：10

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