Effect of WC on electrodeposition and corrosion behaviour of chromium coatings

被引：0

作者：

Surviliene, S. ^{[1
]}

Jasulaitiene, V. ^{[1
]}

Lisowska-Oleksiak, A. ^{[2
]}

Safonov, V.A. ^{[3
]}

机构：

[1] Institute of Chemistry, A. Gostauto 9, 01108 Vilnius, Lithuania

[2] Technical University of Gdansk, G.Narutowicza 11/12, 80952 Gdansk, Poland

[3] Moscow State University, Vorob'evy gory, GSP-3, 119899 Moscow, Russia

来源：

Journal of Applied Electrochemistry | 2005年 / 35卷 / 01期

关键词：

Chromium plating - Composition - Concentration (process) - Corrosion resistance - Cyclic voltammetry - Electrochemical electrodes - Electrodeposition - Metallographic microstructure - X ray diffraction analysis - X ray photoelectron spectroscopy;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

To study the effect of WC particles on corrosion behaviour of chromium coating steel samples were plated in Cr(VI) baths with various concentrations of WC. XPS, EPM and XRD were used to study the chemical composition, morphology and texture of the coatings. The corrosion behaviour was studied at different exposure times in solution containing 0.01 mol L-1 H 2SO4 + 0.5 mol L-1 Na2SO4 using cyclic voltammetry and impedance spectroscopy. Cyclic polarization measurements suggest that WC particles slow down the processes of passive film dissolution and penetration of aggressive ions to the substrate. Electrochemical impedance spectroscopy (EIS) was used to reveal the details of the corrosion process at the solution/electrode interface. The simulation of EIS data with a proposed equivalent circuit model made it possible to obtain quantitative valuation of the Y0 (Qc), Y0 (Q5) and Rpore parameters, reflecting corrosion behaviour of samples at the solution/electrode interface. Samples plated in a Cr(VI) bath with WC provided better resistance to corrosion than those plated in a bath without WC. Analysis of the data obtained suggests that WC particles enhance corrosion resistance due to the microstructural features of the coatings.

引用

页码：9 / 15