MICROSTRUCTURE AND WEARING PROPERTIES OF PEO COATINGS: EFFECTS OF Al2O3 AND TiO2

Y. Zhang, W. Fan, H. Q. Du and Y. W. Zhao
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Y. Zhang: School of Mechanical Engineering, Zhejiang Industry Polytechnic College, Shaoxing 312000, P. R. China†Key Lab of E&M, Ministry of Education & Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, P. R. China
W. Fan: School of Mechanical Engineering, Zhejiang Industry Polytechnic College, Shaoxing 312000, P. R. China
H. Q. Du: School of Mechanical Engineering, Zhejiang Industry Polytechnic College, Shaoxing 312000, P. R. China
Y. W. Zhao: #x2020;Key Lab of E&M, Ministry of Education & Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, P. R. China

Surface Review and Letters (SRL), 2018, vol. 25, issue 05, 1-11

Abstract: Plasma electrolytic oxidation (PEO) coatings were formed on aluminium alloy in additive Al2O3- and TiO2-containing Na2SiO3-based electrolytes, respectively. The effect of these additives on morphology, composition and wearing properties of coatings was investigated. The morphology and composition of coatings were studied by means of scanning electron microscopy (SEM) and X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS). Analysis of wearing properties of coatings were done by friction and wearing experiment. It was found that the use of additives greatly affects the surface morphology of coatings. It is shown that the content of α-Al2O3 in coatings formed in Al2O3-containing electrolytes increased with the addition of Al2O3. However, the content of α-Al2O3 in coatings formed in TiO2-containing electrolytes first increased and then decreased. Among these coatings, the coating formed in silicate-based electrolytes system containing 7g/L Al2O3 showed the most superior wearing properties.

Keywords: Plasma electrolytic oxidation; aluminium alloy; Al2O3; TiO2; wearing properties (search for similar items in EconPapers)
Date: 2018
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DOI: 10.1142/S0218625X18501020

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