不同电压对镁合金微弧氧化膜理化性能及生物活性的影响

摘要

Objective To study the physicochemical properties and biocompatibility of micro-arc oxidation (MAO) coating on AZ31B Mg-alloy and determine the optimal voltage for alloy treatment.Methods We performed MAO treatment of AZ31B Mg-alloy with 3 voltages using silicate as the electrolyte.The element composition,surface roughness,corrosion resistance and hydrophilicity of MAO coating were analyzed with scanning electron microscopy,electrochemical workstation,and a contact angle measurement instrument to determine the optimal voltage for generating surface topography to allow potential biological implantation of the alloy.The corrosion resistance of the MAO coating and osteoblast adhesion on the surface of the alloy treated with this voltage was also analyzed.Results The MAO coating on AZ31B Mg-alloy was composed mainly of Mg,Si and O elements with a rough and porous surface.The increase of voltage for alloy treatment resulted in rougher MAO coating.The MAO coating generated at the voltage of 440 V showed the best hydrophilic property and corrosion resistance with a good biocompatibility.Conclusion The MAO coating on AZ31B Mgalloy has good physicochemical properties and biocompatibility,and the optimal voltage for MAO coating of this alloy is 440 V.%目的:研究AZ31B镁合金微弧氧化膜的理化性能及生物活性,并对处理电压进行优化分析.方法:以硅酸盐为电解液,采用3组电压对AZ31B镁合金进行微弧氧化处理,采用扫描电镜、电化学工作站及接触角测量仪等对膜层的元素组成、粗糙度、耐腐蚀性、亲水性等进行检测,分析得出较具有生物植入前景的表面形貌所对应的电压条件,进一步研究在该电压下的微弧氧化膜的耐腐蚀性及成骨细胞在其表面的粘附情况.结果:AZ31B镁合金微弧氧化膜表面粗糙多孔,膜层主要由Mg、Si和0元素组成.随着电压的升高,微弧氧化膜层的粗糙度增加.440V电压所制备的微弧氧化膜层比其他两组具有更好的亲水性及耐腐蚀性,且该条件下所得的膜具有较好的生物活性.结论:微弧氧化处理后的AZ31B镁合金表面理化性能及生物活性良好,且在440V电压下处理AZ31B所得的微弧氧化膜性能最佳.