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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 15    No. 3    June 2005

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Characterization of oxide films formed on magnesium alloys using bipolar pulse microarc oxidation in phosphate solutions
WANG Li-shi(王立世), CAI Qi-zhou(蔡启舟), 
WEI Bo-kang(魏伯康), LIU Quan-xin(刘全心)

State Key Laboratory of Die and Mould Technology, 
Huazhong University of Science and Technology, Wuhan 430074, China

Abstract:The surface morphology and chemical composition of the oxide films formed on pure magnesium and AZ91D alloy in aqueous electrolytes which contained sodium hexafluorinealuminate(Na3AlF6), potassium hydroxide (KOH), sodium hexametahposphate((NaPO3)6), and triethanolamine were investigated by X-ray diffraction(XRD), scanning electron microscope(SEM) and energy dispersive spectroscopy(EDX). The results show that the input of the negative pulse has great influences on the quantity and the appearance of the microdischarges. Three types of pores can be distinguished on the surface of the oxide film and their size ranges are 0.5-1μm, 1-2μm and 4-7μm, respectively. A few microcracks are seen around the large pores. There exists a remarkable fluoride-enriched zone of about 4-6μm for pure magnesium and 3-5μm for AZ91D alloy at the coating/substrate interface.

 

Key words: magnesium; AZ91D alloy; oxide film; microarc oxidation

ISSN 1672-7029
CN 43-1423/U

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