Effect of K₂Cr₂O₇ on Anti-Biofouling Properties of MAO Coating on Titanium Alloy Surface

Abstract:

Ceramic coatings were prepared on Ti6Al4V alloy surface by applying micro-arc oxidation (MAO) technique. K₂Cr₂O₇ was added into the aluminate-based composite electrolyte for preparing coatings containing Cr. The coatings' morphologies were observed using SEM and their composition was characterized using XRD and EDS. Research shows that the working voltage of MAO reaction was lower after adding K₂Cr₂O₇. The SEM pictures show that the average diameter of micropores decreased while the number increased as the K₂Cr₂O₇ concentration increase. The coatings contain rutile TiO₂, anatase TiO₂, aluminium titanate (Al₂TiO₅) and Cr_0.222Ti_0.778O_1.889 (when adding 1.5g/L K₂Cr₂O₇). The EDS results show that all coatings contained Cr after adding K₂Cr₂O₇ into electrolyte. After immersion test for half year, results show that ceramic coating containing chromium has lower anti-biofouling properties than the substrate.

• Periodical: Applied Mechanics and Materials (Volumes 513-517)
• Pages: 173-176
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.513-517.173
• Online since: February 2014
• Authors: Qiang Yao*, Si Rong Yu, Hong Chao Chu
• Keywords: Anti-Biofouling, K₂Cr₂O₇, Micro-Arc Oxidation, Ti Alloys

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