The Influence of Process Parameters on Properties of Conversion Coatings Deposited on Titanium Alloy

Archives of Metallurgy and Materials

M. Nowak¹  M. Karaś¹  M. Bigaj¹  A. Najder¹ 

[1] Institute of Non-Ferrous Metals in Gliwice, Light Metals Division in Skawina, 19 Pi?sudskiego Str., 32-050 Skawina, Poland

关键词: Keywords: Titanium alloys;    anodising;    corrosion resistance;    polarisation curves;    conversion coatings;   

DOI  :  10.1515/amm-2016-0036

学科分类：金属与冶金

来源: Akademia Gorniczo-Hutnicza im. Stanislawa Staszica / University of Mining and Metallurgy

【 摘 要 】

The effect of process parameters of conversion coatings on the corrosion resistance was investigated. To produce anodic coatings, the solutions of H2SO4 of 0.5 and 1 M concentrations and current densities of 0.5 and 1 A/dm2 were applied. The coatings were deposited by galvanostatic technique on titanium Grade 1. The result of the study was comparison of the corrosion resistance of coatings produced under varying parameters such as: the anodic current density, the electrolyte concentration, and the speed of reaching the preset voltage. Corrosion tests performed by potentiodynamic polarization test have shown that even nanometric anodic films of amorphous structure improve the corrosion resistance of titanium alloy. The lowest corrosion current and the corrosion potential of the most cathodic nature were observed in the sample with anodic coating produced at J = 1 A/dm2 in a 0.5 M H2SO4 electrolyte concentration.

【 授权许可】

Unknown