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

Effects of current frequency on the MAO coatings on AA7050

Y. Zonga School of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;b Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;c Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, People’s Republic of ChinaView further author information
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R. G. Songa School of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;b Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;c Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, People’s Republic of ChinaCorrespondence[email protected] [email protected]
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T. S. Huaa School of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;b Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;c Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, People’s Republic of ChinaView further author information
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S. W. Caia School of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;b Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;c Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, People’s Republic of ChinaView further author information
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C. Wanga School of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;b Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;c Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, People’s Republic of ChinaView further author information
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H. Lia School of Materials Science and Engineering, Changzhou University, Changzhou, People’s Republic of China;b Jiangsu Key Laboratory of Materials Surface Science and Technology, Changzhou University, Changzhou, People’s Republic of China;c Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou University, Changzhou, People’s Republic of ChinaView further author information
Pages 809-816 | Received 07 Jan 2019, Accepted 12 Mar 2019, Published online: 08 Apr 2019
 
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ABSTRACT

In order to solve the corrosion and wear of 7050 aluminium alloy (AA7050) caused by the marine environment and prepare excellent coating structure to prolong its service life, the micro-arc oxidation (MAO) ceramic coatings were prepared at the current frequency of 50, 250, 500, 750, 1000 Hz in the silicate electrolyte, respectively. To analyse the surface morphology, phase composition, corrosion resistance and wear resistance of ceramic coatings, the scanning electron microscopy (SEM), X-ray diffraction (XRD), electrochemical workstation, friction-abrasion tester were used. The results showed that when the current frequency was too low, the mono-pulse energy would be too high and the surface of MAO ceramic coating would be rough, which affected the compactness of the coating. Nevertheless, when the current frequency was too high, it will be unfavourable to the growth of MAO ceramic coating, and the corrosion resistance and wear resistance of the as-prepared coatings were poor.

Disclosure statement

No potential conflict of interest was reported by the authors.

Additional information

Funding

The financial aids of the National Natural Science Foundation of China [grant number 51871031] and the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD) are gratefully acknowledged.

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