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Corrosion and wear properties of electroless Ni-P plating layer on AZ91D magnesium alloy
Authors:LI Zhong-hou  CHEN Zhi-yong  LIU Sha-sha  ZHENG Feng  DAI A-gan
Affiliation:[1]Research Institute of Surface Engineering, Taiyuan University of Technology, Taiyuan 030024, China [2]Shanxi Seikou Institute of Magnesium Technology, Taiyuan 030002, China
Abstract:A direct electroless Ni-P plating treatment was applied to AZ91D magnesium alloy for improving its corrosion resistance and wear resistance. Corrosion resistance of the Ni-P coatings was evaluated by potentiodynamic polarization and immersing experiments in 3.5% NaCl solution. The wear resistance of the coatings was investigated by the wear track and the mass change after ball-on-disk experiment. The results show that corrosion resistance and wear resistance of the AZ91D alloy are greatly improved after direct electroless Ni-P plating. No discoloration is noticed until 4 d of immersion in 3.5% NaCl solution. Potentiodynamic polarization experiments show that the free corrosion potential of magnesium alloy is shifted from -1 500 mV to -250 mV and passivation occurs at 1 350 mV after direct electroless plating. The friction coefficients and wear rates of Ni-P coating and Ni-P coating after tempering are 0.10-0.351, 9.038×10-3 mm3/m and 0.13-0.177, 3.056×10-4 mm3/m, respectively, at a load of 1.5 N with dry sliding. Although minor hurt on corrosion resistance was caused, significant improvement of wear resistance was obtained after tempering treatment of the coating.
Keywords:magnesium alloy  direct electroless Ni-P plating  corrosion resistance  wear resistance
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