张春艳.pH值对镁合金表面水热磷酸钙涂层微观形貌和生物腐蚀性能的影响研究[J].稀有金属材料与工程,2018,47(10):2993~2999.[Zhang Chunyan.Microstructure and Bio-corrosion properties of calcium phosphate coatings on magnesium alloy by hydrothermal treatment at various pH[J].Rare Metal Materials and Engineering,2018,47(10):2993~2999.]
pH值对镁合金表面水热磷酸钙涂层微观形貌和生物腐蚀性能的影响研究
投稿时间:2017-03-09  修订日期:2018-08-31
中文关键词:  Ca-P 涂层  镁合金  水热沉积  腐蚀性能  生物材料
基金项目:
中文摘要:
      为改善镁合金的耐蚀性和生物相容性,在不同pH条件下采用水热法在镁合金AZ31表面制备了磷酸钙(Ca-P)涂层。利用XRD、SEM 和 EDS分析了不同pH值下涂层的物相组成、微观形貌和化学成分;采用Hank’s仿生溶液中电化学测试和浸泡的方法研究了涂层在的生物腐蚀行为。结果表明:水热处理的pH值影响涂层的相组成和微观形貌,涂层的微观形貌影响涂层的防护性能。当pH为6时,Ca-P 涂层由Mg3(PO4)2 和OCP组成,当pH增加到8和10时,Ca-P 涂层为羟基磷灰石(HA)。pH值为8时,HA 涂层呈蜂窝状;pH值为10时,HA 涂层由纳米尺度的棒状晶体构成,该涂层在Hank’s溶液中能有效阻止溶液的渗透而保护基体。
Microstructure and Bio-corrosion properties of calcium phosphate coatings on magnesium alloy by hydrothermal treatment at various pH
英文关键词:Ca-P coating  Magnesium alloy  Hydrothermal deposition  Corrosion property  Biomaterials
英文摘要:
      Calcium phosphate (Ca-P) coatings were deposited on AZ31 magnesium by hydrothermal treatment t at various pH o improve the corrosion resistance and biocompatibility of magnesium alloys. Crystal phase, morphology and composition of the coatings were investigated by XRD, SEM and EDS, respectively. The electrochemical measurements and immersion tests in Hank’s solution were performed to examine the bio-corrosion behaviors of the coated specimens. The results showed that the pH value of solutions influenced the phase composition and microstructure of the coating. And the degree of protection afforded by Ca-P coating varies with their microstructure. The deposited Ca-P coating treated at pH6 was composed of Mg3(PO4)2 and OCP. When the pH values increased, only the HA was formed. The HA coating with nano-scale and rod-like crystals prepared at pH10 can prevent the penetration of solution more effectively than the OCP at pH6 and honeycomb-like HA coating at pH8.
作者单位E-mail
张春艳 重庆理工大学 材料科学与工程学院 zhangchunyan@cqut.edu.cn 
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