Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 18    No. 4    August 2008

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Corrosion and wear properties of electroless Ni-P plating layer on AZ91D magnesium alloy
LI Zhong-hou(李忠厚)1, CHEN Zhi-yong(陈志勇)1, LIU Sha-sha(刘沙沙)1,ZHENG Feng(郑 峰)2, DAI A-gan(戴阿赶)2

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.

 

Key words: magnesium alloy; direct electroless Ni-P plating; corrosion resistance; wear resistance

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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