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. 26    No. 9    September 2016

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Microstructure and properties of alloying coating on AZ31B magnesium alloy
Fen-jun LIU1, Qing-sen MENG2, Zeng-sheng LI1

1. College of Energy Engineering, Yulin University, Yulin 719000, China;
2. College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China

Abstract:Vacuum thermal diffusion technique was applied to preparing alloying coating on AZ31B magnesium alloy. The microstructure and phase composition of the coatings prepared at different holding time were investigated in detail using optical microscopy (OM), scanning electron microscopy (SEM), energy dispersive spectrometer (EDS) and X-ray diffraction (XRD), and so on. The microhardness tester and electrochemical workstation (PS-168a) were used to measure the microhardness and corrosion resistance of the alloying coating. The results showed that the alloying coatings gradually generated with the extension of holding time under constant temperature. And the obvious bonding interface between the coating and substrate was observed, and the bonding interface was changed from smooth to zigzag. EDS and XRD analyses showed that the microstructure of alloying coating mainly consisted of eutectic α-Mg phase and continuous network β-Al12Mg17 phase. The average microhardness of the coatings increased by 113% in comparison to the substrate, and the self-corrosion potential increased from -1.389 to -1.268 V at the same time.

 

Key words: AZ31B magnesium alloy; vacuum diffusion; surface alloying; microhardness; corrosion resistance

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

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

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