Preparation of Superhydrophobic Hydroxyapatite Coating on AZ31B Magnesium Alloy with Self-Cleaning Anti-Corrosion Properties and Excellent Stability

• Published in: Metals and materials international Vol. 30; no. 3; pp. 667 - 681
• Main Authors: Bi, YingJie, Xiong, Wei, Li, ZengQi, Wang, Kang, Liu, Lin, Yin, Xiaoli, Sun, DaiJun, Li, HuaiSen, Song, YuanJi, Li, Wei, Yu, Sirong
• Format: Journal Article
• Language: English
• Published: Seoul The Korean Institute of Metals and Materials 01.03.2024; Springer Nature B.V; 대한금속·재료학회
• Subjects: Antifouling coatings; Characterization and Evaluation of Materials; Chemistry and Materials Science; Cleaning; Contact angle; Corrosion prevention; Corrosion resistance; Engineering Thermodynamics; Heat and Mass Transfer; High temperature; Hydrophobic surfaces; Hydrophobicity; Hydroxyapatite; Machines; Magnesium alloys; Magnesium base alloys; Magnetic Materials; Magnetism; Manufacturing; Materials Science; Metallic Materials; Processes; Protective coatings; Solid Mechanics; Stability tests; Stearic acid; Substrates; 재료공학; HA coating; Anti-corrosion; Stability; Superhydrophobicity; Self-cleaning property
• ISSN: 1598-9623; 2005-4149
• DOI: 10.1007/s12540-023-01529-0

The poor corrosion resistance of magnesium alloy limits its applications. The preparation of superhydrophobic coating on its surface can effectively improve the corrosion resistance, and the self-cleaning performance of superhydrophobic coating can also enhance the anti-fouling performance of magnesium alloy. In this study, the flake superhydrophobic hydroxyapatite (HA) coating with micro-nano scale was prepared on the magnesium alloy surface by electrodeposition, chemical immersion and stearic acid low-energy modification. The measured water contact angle on the coating surface was 160.21° and the sliding angle was 2.5°. The stability tests indicated that the coating has excellent high-temperature resistance and mechanical stability, which opened up the possibility of high-temperature service. The electrochemical test showed that the superhydrophobic HA coating significantly enhanced the corrosion resistance of the magnesium alloy. The effectiveness of the corrosion inhibition was up to 99%, which provided a protective shield for the substrate. This work expects to further broaden the application field of magnesium alloys. Graphical Abstract