摘要
镁合金作为可降解金属生物材料受到人们广泛的关注,然而,它们在生理环境下的快速降解限制了其应用。首先采用碱热处理在镁合金(AZ31B)表面形成钝化层,进而分别自组装3-磷酰基丙酸、3-氨基丙基-三甲氧基硅烷(APTMS)和多巴胺,研究表面改性后材料的耐蚀性能。衰减全反射傅里叶变换红外光谱(ATR-FTIR)、X射线光电子能谱(XPS)及水接触角的实验结果表明,3种分子成功地自组装到碱热处理的镁合金表面;电化学实验、浸泡实验以及浸泡溶液pH变化实验的结果表明,碱热处理有效提高了材料的耐蚀性能,表面自组装改性后,其耐蚀性能进一步提高,其中自组装3-膦酰基丙酸分子的镁合金的耐蚀性最好。
Magnesium alloys,a kind of biodegradable metallic biomaterials,have attracted much attention.However,the rapid degradation in physiological environment limits their applications.In the present study,magnesium alloy（AZ31B）was firstly modified by alkali heat treatment to form a passivation layer on the surface followed by self-assembly of 3-phosphonopropionic acid,（3-aminopropyl）trimethoxysilane and dopamine,respectively.The corrosion resistance of the unmodified and modified samples was investigated.The results of attenuated total reflectance Fourier transform infrared spectroscopy（ATR-FTIR）,X-ray photoelectron spectra and water contact angle experiments indicated that the above three molecules were successfully self-assembled on the alkali heat treated magnesium alloy surface.The results of electrochemical measurements,immersion test and pH value changes of immersion solution suggested that the corrosion resistance of magnesium alloys can be effectively improved by alkali heat treatment and further significantly enhanced by surface self-assemble modification.The corrosion resistance of the self-assembled3-phosphonopropionic acid material was the best.
基金
国家自然科学基金(31470926)
关键词
镁合金
碱热处理
耐蚀性
生物相容性
magnesium alloy
alkali heat treatment
corrosion resistance
biocompatibility
