Ag-containing antibacterial self-healing micro-arc oxidation coatings on Mg-Zn-Sr alloys

• Published in: Surface engineering Vol. 37; no. 7; pp. 926 - 941
• Main Authors: Chen, Yang, Dou, Jinhe, Pang, Zengfen, Zheng, Zhiqiang, Yu, Huijun, Chen, Chuanzhong
• Format: Journal Article
• Language: English
• Published: London, England Taylor & Francis 03.07.2021; SAGE Publications
• Subjects: anti-corrosion; antibacterial; biomaterial; cytocompatibility; magnesium; micro-arc oxidation; Self-sealing; Self-sealing; biomaterial; Ag; anti-corrosion; cytocompatibility; magnesium; antibacterial; micro-arc oxidation
• ISSN: 0267-0844; 1743-2944
• DOI: 10.1080/02670844.2020.1800346

The rapid degradation rate restricts the application of magnesium-based biomaterials. Therefore, we constructed Ag-containing micro-arc oxidation (MAO) coatings on Mg-3Zn-0.5Sr alloys to improve the properties of magnesium alloys. Different concentrations of CH 3 COOAg (0, 1, 2, 3 g L −1 ) were added into the electrolyte to investigate the effects of Ag + content on properties of MAO coatings. The addition of CH 3 COOAg led to the formation of Ag 2 O and Ag 2 CO 3 phases, which sealed the micro-pores and improved the corrosion resistance of the samples significantly. The samples with addition of 2 and 3 g L −1 CH 3 COOAg exhibited strong antibacterial ability against E.coli due to the gradual release of Ag + in the degradation process. It was verified that the samples with addition of 2 g L −1 CH 3 COOAg obtained the most high bonding strength, dense construction, excellent corrosion resistance, cytocompatibility and antibacterial properties. The bacteria-killing methods of Ag-containing MAO coatings were discussed in the article.