Microstructure and Corrosion Properties of Calcium Phosphate Coating on Magnesium Alloy Prepared by Hydrothermal Treatment at Various pH Values

IF 0.6 4区材料科学 Q4 MATERIALS SCIENCE, MULTIDISCIPLINARY

稀有金属材料与工程 Pub Date : 2018-10-01 DOI:10.1016/S1875-5372(18)30223-6

Zhang Chunyan , Zhang Shiyu , Liu Xinpeng , He Hongchuan

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引用次数: 7

Abstract

Calcium phosphate (Ca-P) coatings were deposited on AZ31 magnesium by hydrothermal treatment at various pH values to improve the corrosion resistance and biocompatibility of magnesium alloys. The crystal phase, morphology and composition of the coatings were investigated by XRD, SEM and EDS, respectively. Electrochemical measurements and immersion tests were performed in Hank's solution to examine the bio-corrosion behaviors of the coated specimens. The results show that the pH value of solutions influences the phase composition and microstructure of the coating. And the degree of protection provided by the Ca-P coating varies with its microstructure. The deposited Ca-P coating treated at pH=6 is composed of OCP (Ca₈H₂(PO₄)₆·5H₂O). When the pH value increases to 8 and 10, only the HA is formed. The HA coating with nano-scale and rod-like crystals prepared at pH=10 can prevent the penetration of solution more effectively than the OCP coating at pH=6 and the honeycomb-like HA coating at pH=8.

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不同pH值下水热法制备镁合金表面磷酸钙涂层的组织与腐蚀性能

采用水热法在AZ31镁合金表面沉积了不同pH值的磷酸钙(Ca-P)涂层，以提高镁合金的耐腐蚀性和生物相容性。采用XRD、SEM和EDS对涂层的晶相、形貌和成分进行了表征。在汉克溶液中进行了电化学测量和浸泡试验，以研究涂层试样的生物腐蚀行为。结果表明，溶液的pH值影响涂层的相组成和显微组织。Ca-P涂层的保护程度随其微观结构的不同而不同。经pH=6处理后沉积的Ca-P涂层由OCP (Ca8H2(PO4)6·5H2O)组成。当pH值增加到8和10时，只形成HA。pH=10时制备的纳米级棒状HA涂层比pH=6时的OCP涂层和pH=8时的蜂窝状HA涂层更能有效地阻止溶液的渗透。

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