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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(英文),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.]
Microstructure and Bio-corrosion properties of calcium phosphate coatings on magnesium alloy by hydrothermal treatment at various pH
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Received:March 09, 2017  Revised:August 31, 2018
DOI:
Key words: Ca-P coating  Magnesium alloy  Hydrothermal deposition  Corrosion property  Biomaterials
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Zhang Chunyan  
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Abstract:
      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.