Materials Transactions Online

Materials Transactions, Vol.52 No.04 (2011) pp.810-813
© 2011 The Japan Institute of Metals

Laser Forming of Zr-Based Coatings on AZ91D Magnesium Alloy Substrates for Wear and Corrosion Resistance Improvement

T. M. Yue and K. J. Huang

The Advanced Manufacturing Technology Research Centre, Department of Industrial and Systems Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, P.R.China

To improve the wear and corrosion resistance of AZ91D magnesium alloy, Zr-based coatings were fabricated on the alloy substrate using laser forming. They were prepared from (i) Zr+Mg powders (5:1 mass%), and (ii) an undercoating of Zr+Mg powders (5:1 mass%) with a top layer of Zr powder. The Zr+Mg powder coating was found to consist primarily of Zr particles with some Zr-based intermetallic compounds in a Mg-Al matrix; while that with an extra top coating of Zr powder had an outer layer composed of Zr oxides and Zr aluminides. With regard to wear and corrosion resistance, the highest improvement was obtained for the specimen that was clad with a top layer of Zr powder. Compared to the AZ91D specimen without a laser formed coating, a fivefold decrease in weight loss and around three orders of magnitude decrease in corrosion current density respectively were obtained.

(Received 2010/8/16; Accepted 2011/1/24; Published 2011/3/9)

Keywords: laser processing, magnesium, biomaterial, zirconium coating, wear, corrosion

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