电解液中钙磷组分对镁合金MAO生物陶瓷膜层特性的影响

发布时间：2018-11-23 19:25

【摘要】：采用恒流模式,通过单变量实验改变电解液中乙酸钙、六偏磷酸钠和磷酸二氢钠等钙磷组分的浓度,在AZ31镁合金表面制备微弧氧化生物陶瓷膜,观察分析膜层微观组织结构,测定膜层表面Ca/P比、耐蚀性等,探讨钙磷组分及其浓度对膜层组织和性能的影响,进而对电解液进行优化,并对优化后的膜层性能进行观察和分析。结果表明:乙酸钙、六偏磷酸钠、磷酸二氢钠对膜层Ca、P元素含量及Ca/P比值有决定作用;乙酸钙浓度越高,膜层厚度越小,但是均一性越好;六偏磷酸钠浓度对膜层表面形貌和厚度几乎无影响,其浓度越高,膜层中P元素含量越高;磷酸二氢钠浓度越高,Ca/P比值越小。电解液优化后,制备的膜层较为平整致密,表面均匀分布10.7μm左右的微孔,但存在微裂纹;膜层主要由MgO、Mg和少量Ca2P2O7、SiO2等物相组成,使硬度和耐蚀性比镁合金基体有明显提高;膜层粗糙度Ra=0.45μm,润湿角为42.65°,有利于细胞的附着与生长。
[Abstract]:The microarc oxidized bioceramic films were prepared on the surface of AZ31 magnesium alloys by changing the concentration of calcium acetate, sodium hexametaphosphate and sodium dihydrogen phosphate in the electrolyte by single variable experiment in constant current mode. The microstructure of the coatings was observed and analyzed. The surface Ca/P ratio and corrosion resistance of the film were measured. The effects of calcium and phosphorus components and their concentration on the structure and properties of the film were discussed. The electrolyte was optimized and the properties of the optimized film were observed and analyzed. The results showed that calcium acetate, sodium hexametaphosphate and sodium dihydrogen phosphate had a decisive effect on the content of Ca,P and the ratio of Ca/P, the higher the concentration of calcium acetate was, the smaller the thickness of the film was, but the better the uniformity was. The concentration of sodium hexametaphosphate had little effect on the surface morphology and thickness of the film. The higher the concentration of sodium hexametaphosphate was, the higher the content of P in the film was, and the higher the concentration of sodium dihydrogen phosphate was, the smaller the ratio of Ca/P was. After the electrolyte was optimized, the film was smooth and compact, and the surface of the film was evenly distributed about 10.7 渭 m of micropores, but there were microcracks. The hardness and corrosion resistance of the coating are mainly composed of MgO,Mg and a small amount of Ca2P2O7,SiO2. The roughness of the coating is Ra=0.45 渭 m and the wetting angle is 42.65 掳, which is beneficial to cell adhesion and growth.
【作者单位】：江苏科技大学;
【基金】：江苏高校优势学科建设工程资助项目(苏政办[2011]6) 江苏省先进焊接技术重点实验室资助项目(JSAWT-11) 江苏省高校研究生科研创新计划资助项目(2014-1081)
【分类号】：TG174.4

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