Effects of HBN particle sizes on microstructure and performances of PEO coatings on 7075-T6 aluminum alloy

被引：0

作者：

Wang Q.-C. ^{[1
]}

Wang S.-X. ^{[1
]}

Du N. ^{[1
]}

Cheng F.-S. ^{[2
]}

Zhao Q. ^{[1
]}

Li X.-Y. ^{[3
]}

机构：

[1] National Defense Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang

[2] AECC Guizhou Liyang Aviation Power Co., Ltd., Liyang

[3] Corrosion and Protection Center, University of Science and Technology Beijing, Beijing

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 11期

基金：

中国国家自然科学基金;

关键词：

7075-T6; alloy; HBN particles; Micro-structure; PEO; Performances;

D O I：

10.19476/j.ysxb.1004.0609.2019.11.02

中图分类号：

学科分类号：

摘要：

Al2O3/HBN composite coatings were prepared on 7075-T6 aluminum alloy by plasma electrolysis oxidation (PEO) in silicate-phosphate mixed electrolyte with HBN particles of different sizes. The microstructure, composition, wear resistance and corrosion resistance of the composite coating were analyzed by SEM, EDS, XRD, wear test and polarization curves. The results show that HBN particles can accelerate the breakdown discharge process of coating, and promote the pre-growth stage of PEO coating. The incorporation of HBN particles also makes PEO coating more dense, but increase the roughness. Whether HBN particle size is 5, 10 or 30 μm, the addition of 4 g/L HBN particles in the electrolyte can reduce the surface micropores number and the internal defects of PEO coating, and make the coating surface be flatter. The content of Al2O3 crystal phase in the PEO composite coatings also increases. Compared with PEO coating, the PEO/HBN composite coatings have smaller friction coefficient, lower wear rate and better wear properties. Among them, the PEO composite coating prepared in electrolyte containing 10 μm HBN particles shows the best wear resistance, and the specific wear rate decreases by 42.5%. Besides, the PEO/HBN composite coatings have better corrosion resistance, the corrosion current density is one order of magnitude lower than that of the uncomposited PEO coating, and the surface corrosion of PEO sample prepared in electrolyte with 5 μm HBN particles is the slightest after 1800 h simulated seawater immersion test. © 2019, Science Press. All right reserved.

引用

页码：2459 / 2470

页数：11

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