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Effect of post-treated methods on corrosion resistance of MF-DC magnetron sputtering Al coating on TC4

Wensheng Li (Aerospace Precision Products Inc., Ltd, Tianjin, China)
Yiding Zhang (Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin, China)
Yanwei Xu (Aerospace Precision Products Inc., Ltd, Tianjin, China)
Guangming Jiao (Aerospace Precision Products Inc., Ltd, Tianjin, China)
Dunwen Zuo (College of Mechanical and Electrical Engineering, NUAA, Nanjing, China)
Wenting Lu (Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin, China)
Quanshi Cheng (Aerospace Precision Products Inc., Ltd, Tianjin, China)
Jiaqi Yu (Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin, China)
Yajun Chen (Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin, China)

Anti-Corrosion Methods and Materials

ISSN: 0003-5599

Article publication date: 10 November 2023

Issue publication date: 2 January 2024

44

Abstract

Purpose

This study aims to investigate the effect of post-treatment on anti-corrosion performance of Al coating on the surface of Ti-6Al-4V (TC4) fastener.

Design/methodology/approach

The Al coatings with different layer structures were prepared on TC4 by middle-frequency and direct-current combined magnetron sputtering. The cross-sectional morphology and surface roughness of coatings were characterized by scanning electron microscope and atomic force microscope. The corrosion resistance was evaluated by electrochemical method. The monolayer coating was post-treated by Alodine chemical conversion, Ar+ bombardment and a combination of two methods above.

Findings

The results show that the interfaces in bilayer and trilayer coatings reduce the defects. Ar+ bombardment reduces the corrosion current density, and Alodine chemical conversion leads to a higher pitting corrosion potential. The combined post-treatment has the highest polarization resistance.

Originality/value

The corrosion resistance of the Al coating is enhanced as the layer quantity increases. The combination of two post-treatments, Ar+ bombardment and Alodine chemical conversion, could achieve an overall improvement in corrosion resistance of Al coating.

Keywords

Acknowledgements

The authors thank Tianjin Key Laboratory of Fastener Connection Technology Enterprises in 2022–2023 Open Project “Research on Atlas and Basic Data for Typical Fasteners for Aircraft Structures (Grant No. TKLF2022-02-A-01)” for financially supporting this research.

Declaration of interest statement: The authors declare that they do not have any commercial or associative interest that represents a conflict of interest in connection with the work submitted.

Citation

Li, W., Zhang, Y., Xu, Y., Jiao, G., Zuo, D., Lu, W., Cheng, Q., Yu, J. and Chen, Y. (2024), "Effect of post-treated methods on corrosion resistance of MF-DC magnetron sputtering Al coating on TC4", Anti-Corrosion Methods and Materials, Vol. 71 No. 1, pp. 12-19. https://doi.org/10.1108/ACMM-07-2023-2857

Publisher

:

Emerald Publishing Limited

Copyright © 2023, Emerald Publishing Limited

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