摘要
通过微弧氧化结合涂覆氧化石墨烯(GO)薄膜方法对已制备的Zn-2.5Cu合金进行表面复合改性处理。研究了微弧氧化膜层的显微组织、膜层厚度和物相组成。观察了不同GO浓度下Zn-2.5Cu合金表面复合膜层的显微组织及其仿生矿化能力。结果表明:当微弧氧化电流为3 A,氧化时间为2 min,Zn-2.5Cu合金表面的微弧氧化膜层孔洞细小而均匀,膜层质量较好,膜层厚度为61.9μm,氧化膜层主要由ZnO、Zn_(2)SiO_(4)和Zn(OH)_(2)相组成。当GO分散液浓度为1.5 mg/mL时,可在微弧氧化后Zn-2.5Cu合金表面覆盖一层均匀的GO薄层,在模拟人工体液中浸泡4 d时,复合改性后样品表面形成一层较厚且致密的HA涂层;在模拟体液中浸泡40 d后,该膜层腐蚀速率为0.015 mm·α^(-1),与人体植入可降解材料的理想腐蚀速率相接近。这说明与纯Zn-2.5Cu合金相比,经复合改性处理后的Zn-2.5Cu合金的生物活性和生物相容性得到提高。
The prepared Zn-2.5Cu alloys were multiply modified by micro-arc oxidation and coating graphene oxide(GO)film.The film microstructure,film thickness and phase constitution after micro-arc oxidation were studied.The microstructure and biomimetic mineralization ability of the composite coating of Zn-2.5Cu alloys at different GOconcentration were observed.The results show the oxidation film of Zn-2.5Cu alloys with the thickness of 61.9μm has small and uniform pores at oxidation current intensity of 3 A,oxidation time of 2 min.The quality of the film is better.The micro-arc oxidation coating is mainly composed of ZnO,Zn_(2)SiO_(4)and Zn(OH)_(2)phases.When GO concentration is 1.5 mg/mL,uniform GO film can be formed on the surface of the Zn-2.5Cu alloys after micro-arc oxidation by drip coating method.After immersed in SBF for 4 d,a film of dense HA layer can be formed on the surface of multiply modified samples.After immersed in SBF for 40 d,the corrosion rate of the alloys after multiply modification is 0.015 mm·α^(-1),which matches with that of implanted biodegradable materials.Compared with pure Zn-2.5Cu alloys,the Zn-2.5Cu alloys after composite modification treatment have better biological activity and biocompatibility.
作者
张硕
李强
孙旭东
ZHANG Shuo;LI Qiang;SUN Xudong(College of Materials Science&Engineering,Liaoning University of Technology,Jinzhou 121001,China;School of Materials Science&Engineering,Northeastern University,Shenyang 110004,China)
出处
《热加工工艺》
北大核心
2021年第22期82-87,共6页
Hot Working Technology
基金
国家自然科学基金资助项目(51805236)
辽宁省教育厅基础研究项目(JJL201915407)。
