Ag-containing antibacterial self-healing micro-arc oxidation coatings on Mg–Zn–Sr alloys. (3rd July 2021)

• Record Type: Journal Article
• Authors: Chen, Yang; Dou, Jinhe; Pang, Zengfen; Zheng, Zhiqiang; Yu, Huijun; Chen, Chuanzhong
• Is Part Of: Surface engineering. Volume 37:Number 7(2021)
• Page Start: 926
• Page End: 941
• Publication Date: 2021-07-03
• Subjects: Self-sealing -- antibacterial -- anti-corrosion -- cytocompatibility -- Ag -- magnesium -- biomaterial -- micro-arc oxidation; Surfaces (Technology) -- Periodicals; Coatings -- Periodicals; 620.4405
• DOI: 10.1080/02670844.2020.1800346
• Languages: English
• ISSNs: 0267-0844

Abstract

ABSTRACT: 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 CH3 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 CH3 COOAg led to the formation of Ag2 O and Ag2 CO3 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 CH3 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 CH3 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.