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AZ91D magnesium alloy; electroless NiWP coating; temperature; corrosion resistance.

The effect of plating temperatures between 60 and 90$^{\circ}$C on structure and corrosion resistance for electroless NiWP coatings on AZ91D magnesium alloy substrate was investigated. Results show that temperature has a significant influence on the surface morphology and corrosion resistance of the NiWP alloy coating. An increase in temperature will lead to an increase in coating thickness and form a more uniform and dense NiWP coatings. Moreover, cracks were observed by SEM in coating surface and interface at the plating temperature of 90$^{\circ}$C. Coating corrosion resistance is highly dependent on temperature according to polarization curves. The optimum temperature isfound to be 80$^{\circ}$C and the possible reasons of corrosion resistance for NiWP coating have been discussed.

M Q YU¹ Q QIAO² F YOU² C L LI² Y ZHAO² Z Z XIAO² H L LUO¹ Z F XU¹ KAZUHIRO MATSUGI¹ J K YU²

1. Graduate School of Engineering, Hiroshima University, 1-4-1 Kagamiyama, 739-8527 Higashi-Hiroshima, Japan
2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei, People’s Republic of China

Published

15 April 2016

Manuscript received

20 April 2016

Accepted

11 November 2015