The preparation and corrosion behaviors of MAO coating on AZ91D with rare earth conversion precursor film

被引：137

作者：

Cai, Jingshun ^{[1
]}

Cao, Fahe ^{[1
]}

Chang, Linrong ^{[1
]}

Zheng, Junjun ^{[1
]}

Zhang, Jianqing ^{[1
,2
]}

Cao, Chunan ^{[1
,2
]}

机构：

[1] Zhejiang Univ, Dept Chem, Hangzhou 310027, Zhejiang, Peoples R China

[2] Chinese Acad Sci, State Key Lab Corros & Protect, Inst Met Res, Shenyang 110016, Peoples R China

来源：

APPLIED SURFACE SCIENCE | 2011年 / 257卷 / 08期

关键词：

Magnesium alloy; Rare earth conversion film; Micro-arc oxidation; Porosity; MG-AL ALLOYS; MAGNESIUM ALLOYS; ELECTROLYTE; CERIUM; RESISTANCE; PHOSPHATE;

D O I：

10.1016/j.apsusc.2010.11.153

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

A novel kind of micro-arc oxidation (MAO) coating was prepared on magnesium alloy surface coated with rare earth conversion film (RE-film) in an alkaline aluminum oxidation electrolyte by AC power source. Inspection of scanning electron microscopy (SEM), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) microspectroscopy, the structure and composition of MAO coating formed on AZ91D with RE-film under different applied voltages were investigated and the performance of the optimized MAO coating compared with the MAO coating directly formed on magnesium alloy. As the pretreatment of magnesium alloy with RE-film, the cerium oxides can be incorporated into the MAO coatings, reduce porosity of the MAO coating surface and enhance the thickness of MAO coating. These structure features and the cerium oxides incorporated into the MAO coating result in greatly improved corrosion resistance. Base on electrochemistry impedance spectroscopy (EIS) measurement, the electronic structure and composition analysis of the MAO coating, a double-layer structure, with a compact inner layer and a porous outer layer, of the coating was proposed for understanding its corrosion process. (C) 2010 Elsevier B.V. All rights reserved.

引用

页码：3804 / 3811

页数：8

共 29 条

[1] Influence of electrolyte on corrosion properties of plasma electrolytic conversion coated magnesium alloys
Blawert, C.
Heitmann, V.
Dietzel, W.
Nykyforchyn, H. M.
Klapkiv, M. D.
[J]. SURFACE & COATINGS TECHNOLOGY, 2007, 201 (21) : 8709 - 8714
[2] Active corrosion protection in Ce-modified hydrotalcite conversion coatings
Buchheit, RG
Mamidipally, SB
Schmutz, P
Guan, H
[J]. CORROSION, 2002, 58 (01) : 3 - 14
[3] Cao F.H., 2007, MATER CORROS, P696
[4] Formation and transformation of Mg(OH)2 in anodic coating using FTIR mapping
Chang, Linrong
Cao, Fahe
Cai, Jingshun
Liu, Wenjuan
Zhang, Jianqing
Cao, Chunan
[J]. ELECTROCHEMISTRY COMMUNICATIONS, 2009, 11 (11) : 2245 - 2248
[5] Porosity and corrosion properties of electrolyte plasma coatings on magnesium alloys
Dietzel, W
Klapkiv, M
Nykyforchyn, H
Posuvailo, V
Blawert, C
[J]. MATERIALS SCIENCE, 2004, 40 (05) : 585 - 590
[6] Effect of electrolyte additives on performance of plasma electrolytic oxidation films formed on magnesium alloy AZ91D
Duan, Hongping
Yan, Chuanwei
Wang, Fuhui
[J]. ELECTROCHIMICA ACTA, 2007, 52 (11) : 3785 - 3793
[7] Protective coatings on magnesium and its alloys - a critical review
Gray, JE
Luan, B
[J]. JOURNAL OF ALLOYS AND COMPOUNDS, 2002, 336 (1-2) : 88 - 113
[8] Effect of surfactants on surface morphology of ceramic coatings fabricated on magnesium alloys by micro-arc oxidation
Guo, HF
An, MZ
[J]. THIN SOLID FILMS, 2006, 500 (1-2) : 186 - 189
[9] Structure and mechanical properties of magnesium alloy treated by micro-arc discharge oxidation using direct current and high-frequency bipolar pulsing modes
Jin, Fanya
Chu, Paul K.
Xu, Guidong
Zhao, Jun
Tang, Deli
Tong, Honghui
[J]. MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2006, 435 : 123 - 126
[10] The anodic behavior of binary Mg-Al alloys in KOH-aluminate solutions
Khaselev, O
Yahalom, J
[J]. CORROSION SCIENCE, 1998, 40 (07) : 1149 - 1160

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