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Surface Engineering Volume 36, 2020 - Issue 8: Special Issue: Corrosion and Oxidation
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Research Articles

Influence of microstructure of TC4 substrate on the MAO coating

Guolong Wua Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, People’s Republic of China;b College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, People’s Republic of ChinaView further author information
,
Ye Wanga Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, People’s Republic of China;b College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, People’s Republic of ChinaView further author information
,
Min Suna Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, People’s Republic of China;b College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, People’s Republic of ChinaView further author information
,
Qunli Zhanga Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, People’s Republic of China;b College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, People’s Republic of ChinaView further author information
&
Jianhua Yaoa Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, People’s Republic of China;b College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, People’s Republic of ChinaCorrespondence[email protected]
View further author information
Pages 827-836 | Received 19 Jun 2019, Accepted 08 Nov 2019, Published online: 28 Nov 2019
 
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ABSTRACT

The influence of microstructures of the two TC4 substrates on the growth process and properties of micro-arc oxidation (MAO) coatings were investigated and compared. The morphologies, thickness, roughness and compositions of the coatings on forging-TC4 (F-MAO) and SLM-TC4 (S-MAO) were characterised by scanning electron microscopy, atomic force microscopy, energy-dispersive spectroscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The SLM-TC4 exhibits needles of α′ phase, while forging-TC4 have distinct α and β phases. The results show that α′ phase of SLM-TC4 causes the discharge channels to be uniform during MAO process, making S-MAO free of cracks. The S-MAO coating has smaller pores and lower roughness, but thicker than that of F-MAO coating. S-MAO coating has better corrosion resistance and biological activity than that of F-MAO in SBF.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The authors would like to appreciate financial supports from the National Natural Science Foundation of China [51975533 and 51605441].

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