Author:
Liu Tongfang,Rui Song,Li Sheng
Abstract
Mg alloys are promising biomedical metal due to their natural degradability, good processability, and favorable mechanical properties. However, the poor corrosion resistance limits their further clinical applications. In this study, the combined strategies of surface chemical treatment and layer-by-layer self-assembly were used to prepare composite coatings on Mg alloys to improve the biocorrosion resistance. Specially, alkalized AZ91 Mg alloy generated chemical linkage with silane via Si–O–Mg covalent bond at the interface. Subsequently, Si–OH group from silane formed a crosslinked silane layer by Si–O–Si network. Further chemical assembly with graphene oxide (GO), lengthened the diffusion pathway of corrosive medium. The chemically assembled composite coatings could firmly bond to Mg alloy substrate, which persistently and effectively acted as compact barriers against corrosion propagation. Improved biocorrosion resistance of AZ91 Mg alloy with self-assembly composite coatings of silane/GO was subsequently confirmed by immersion tests. Besides, the Mg alloy exhibited good wear resistance due to outside layer of GO with a lubricant effect. Cell viability of higher than 75% had also been found for the alloy with self-assembly composite coatings, which showed good cytocompatibility.
Funder
Hunan Provincial Department of Education
Subject
Materials Chemistry,Surfaces, Coatings and Films,Surfaces and Interfaces
Reference72 articles.
1. The development of binary Mg–Ca alloys for use as biodegradable materials within bone
2. In Situ Formation of Intermetallic Compound Bonding by Laser Cladding Al2O3 to Enhance the Corrosion Resistance of AZ31 Magnesium Alloy;Xiang;Lasers Eng.,2020
3. Al
2
O
3
eliminating defects in the Al coating by laser cladding to improve corrosion and wear resistance of Mg alloy
4. Microstructure, mechanical and corrosion properties of novel Mg-Sn-Ce alloys produced by high pressure die casting
5. Comparative in v itro study on binary Mg-RE (Sc, Y, La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu) alloy systems;Ji;Acta Biomater.,2020
Cited by
7 articles.
订阅此论文施引文献
订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献