Formation mechanism of a self-sealing pore micro-arc oxidation film on AM60 magnesium alloy

被引：63
作者：
Dong, Kaihui [1 ]
Song, Yingwei [1 ]
Shan, Dayong [1 ]
Han, En-Hou [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang 110016, Peoples R China
来源：
SURFACE & COATINGS TECHNOLOGY | 2015年 / 266卷
基金：
中国国家自然科学基金;
关键词：
Formation mechanism; Magnesium alloy; Micro-arc oxidation; Self-sealing pore; Fluorotitanate electrolyte; PLASMA ELECTROLYTIC OXIDATION; CORROSION BEHAVIOR; CERAMIC COATINGS; ZIRCONIUM-OXIDES; MG ALLOY; ALUMINUM; MAO; MICROSTRUCTURE; RESISTANCE; GROWTH;
D O I：
10.1016/j.surfcoat.2015.02.041
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Ceramic films are formed on AM60 magnesium alloy by micro-arc oxidation (MAO) using a new fluorotitanate electrolyte system. Compared to the films obtained with traditional electrolytes, the film has the characteristics of self-sealing pores and different chemical compositions. To investigate the film's growth mechanism, X-ray diffraction (XRD), energy dispersive X-ray spectroscopy (EDX) and X-ray photoelectron spectroscopy (XPS) were used to characterize the phase structure and chemical composition. Mott-Schottky (M-S) curve measurements were used to study the electrical properties of the passive layer and the influence of the fluorine during initial film deposition. The NaF content in the new electrolyte plays an important role in improving the compactness of the initial film. By increasing oxidation voltages in the MAO process, an increase of titanium oxides in the film is produced. Different melting points of film constituents and high titanium oxide content in the MAO film are key factors for forming self-sealing pores. (C) 2015 Elsevier B.V. All rights reserved.
引用
收藏
页码：188 / 196
页数：9
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