Effect of micro-groove on microstructure and performance of MAO ceramic coating fabricated on the surface of aluminum alloy

被引：24
作者：
Wang, Jian [1 ]
Huang, Shuai [1 ]
Huang, Hongjian [2 ]
He, Mingyang [1 ]
Wangyang, Peihua [3 ]
Gu, Lin [1 ]
机构：
[1] Xihua Univ, Sch Mat Sci & Engn, Chengdu 610039, Sichuan, Peoples R China
[2] Akita Prefectural Univ, Fac Syst Engn, Dept Machine Intelligence & Syst Engn, Akita 0150055, Japan
[3] Chengdu Univ Informat Technol, Sch Optoelect Technol, Informat Mat & Devices Applicat Key Lab Sichuan P, Chengdu 610225, Sichuan, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2019年 / 777卷
基金：
中国国家自然科学基金;
关键词：
Aluminum alloy; Micro-arc oxidation; Micro-groove; Ceramic coating; ARC OXIDATION COATINGS; PLASMA ELECTROLYTIC OXIDATION; CORROSION BEHAVIOR; MAGNESIUM ALLOY; WEAR-RESISTANCE; TITANIUM-ALLOY; TI-6AL-4V; FREQUENCY; SUBSTRATE; FILMS;
D O I：
10.1016/j.jallcom.2018.10.374
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：
Micro-arc oxidation (MAO) ceramic coatings on the surface of aluminum alloy substrates with and without micro-groove have been successfully fabricated in the Na2SiO3-NaOH-EDTA-2Na solution. Microstructure characterization indicated that the micro-grooves on substrate surface could increase the content of alpha-Al2O3, gamma-Al2O3 and 3Al(2)O(3)center dot 2SiO(2) phases and reduce the content of Al phase in the ceramic coating due to the sharp corner effect. EDS and XPS analysis showed that the content of Al and Si on the near outer surface of MAO coating on grooved substrate was more than that on non-grooved substrate. Meanwhile, MAO ceramic coating on micro-grooved substrate exhibited the faster growth rate in the initial stage of oxidation and the lower growth rate in the later oxidation. The final MAO coating showed the bigger micro pores and thicker oxidation film compared with that on the non-grooved substrate. Furthermore, the surface micro grooving pretreatment could dramatically improve the wear resistance and hardness of MAO coating, and the highest hardness of ceramic coatings of grooved substrate was around 1715 HV, which could be attributed to their special trapezoidal micro-groove structure. (C) 2018 Elsevier B.V. All rights reserved.
引用
收藏
页码：86 / 93
页数：8
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