镁合金AZ31表面液相沉积Ca-P生物陶瓷涂层的研究

Study on Chemical Deposition of Calcium Phosphate Bioceramic Coating on AZ31 Magnesium Alloy Surface

摘要:

研究了镁合金AZ31经过预钙吸附和阳极氧化预处理后，在Hank's溶液、Ca(NO3)2和NH4H2PO4混合溶液(简称Ca-P溶液)中制备Ca-P基生物陶瓷涂层的可能性。利用能谱分析仪和X射线衍射仪分析了涂层的化学成分和相组成。结果表明，两种预处理后的AZ31镁合金在Hank's溶液中均不能沉积得到涂层。而在Ca-P溶液中浸泡48 h后，镁合金表面均沉积了Ca-P涂层。其结晶产物主要为透钙磷石（CaHPO4·2H2O）和少量的Ca(H2PO4)2。预钙吸附处理后镁合金表面形成钙的形核点，在Ca-P溶液中

Abstract:

The preparation possibility of the calcium phosphate (Ca-P) bioceramic coating on AZ31 magnesium alloy treated by pre-calcification (pre-Ca) and the anodized oxidation process in Hank’s solutions and a mixed solution of Ca(NO3)2 and NH4H2PO4 (Ca-P solution) was investigated. The chemical composition and phase composition of the coating were analyzed by EDS and XRD. Results indicate that any coating on the AZ31 alloy treated by the above two pre-treatments could not be obtained in Hank’s solutions, whereas Ca-P coatings on the same substrates were acquired after the alloys were immersed in Ca-P solutions for 48 h. It was confirmed that this coating consisted of Brushite (CaHPO4·2H2O) and minor Ca(H2PO4)2. Ca nucleation site appeared on the surface of AZ31 alloy after pre-Ca treatment, and the deposited coatings in Ca-P solutions were uniform and compact. They were composed of flake-like crystals with 20~50 μm length and width, which interlaced each other. On the contrary, the coatings on the alloy treated by anodized oxidation in Ca-P solutions were leaf-like and not compact.