Characterization of oxide films formed on magnesium alloys using bipolar pulse microarc oxidation in phosphate solutions

被引：0

作者：

王立世

蔡启舟

魏伯康

刘全心

机构：

[1] State Key Laboratory of Die and Mould Technology

[2] Huazhong University of Science and Technology

[3] Wuhan

[4] China

来源：

TransactionsofNonferrousMetalsSocietyofChina | 2005年 / 03期

关键词：

magnesium; AZ91D alloy; oxide film; microarc oxidation;

D O I：

暂无

中图分类号：

TG174.4 [金属表面防护技术];

学科分类号：

080503 ;

摘要：

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 0.5-1μm, 1-2μm and 4-7μm, respectively. A few microcracks are seen around the large pores. There exists a remarkable ~fluoride- enriched zone of about 4-6μm for pure magnesium and 3-5μm for AZ91D alloy at the coating/substrate interface.

引用

页码：600 / 605

页数：6

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