电化学沉积法制备镁基Ca-P生物陶瓷涂层的研究  

Electrochemically deposited Ca-P coatings on magnesium alloy

作　　者：张春艳[1,2] 高家诚[1] 曾荣昌[2] 杨惠[2] 吴霞[2] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400030 [2]重庆理工大学材料科学与工程学院,重庆400050

出　　处：《功能材料》2010年第6期952-956,960,共6页Journal of Functional Materials

基　　金：重庆市自然科学基金资助项目(2008BB0063)

摘　　要：利用电化学沉积法在AZ31镁合金表面制备了Ca-P基生物涂层,使用扫描电子显微镜观察了经不同沉积时间处理后的涂层形貌,采用X射线衍射和能谱分析了涂层的结构和成分,通过电化学测试技术研究了在Hank’s仿生溶液中AZ31镁合金及其Ca-P涂层的腐蚀行为。结果表明,镁合金表面在Ca(NO3)2和NH4H2PO4电解液中电化学沉积形成Ca-P涂层由DCPD(CaHPO4·2H2O)片状晶体组成。且涂层形貌随时间发生变化。AZ31镁合金表面的钙磷涂层提高了镁合金的自腐蚀电位,显著地减小了镁合金的腐蚀电流密度。这表明经钙磷涂层处理的AZ31镁合金耐蚀性能得到明显的提高。钙磷涂层的形貌和结晶程度影响AZ31镁合金的耐蚀性。Calcium phosphate coatings were deposited on AZ31 magnesium alloys by virtue of electrochemical deposition.The compositions,phase structures and morphologies of the coatings in different deposition time were investigated by means of X-ray diffractometer（XRD）,energy dispersive spectroscopy（EDS） and scanning electron microscope（SEM）.The potentiodynamic electrochemical technique was employed to study the corrosion behavior of Ca-P coatings on AZ31 magnesium alloys in Hank＇s solutions.The results showed that coatings＇ morphology changed with deposition time in the deposition process in a bath containing Ca（NO3）2 and NH4H2PO4.The coatings were flake-shape crystals composed of brushite（DCPD,CaHPO4·2H2O）.Significant increase in free corrosion potentials and decrease in corrosion current density indicated that the Ca-P coatings improved corrosion resistance of the AZ31 alloy.The morphologies and the degrees of crystallization of the coatings have obvious influence on corrosion property.

关 键 词：电化学沉积 Ca-P涂层 镁合金 腐蚀 生物材料 

分 类 号：TG174.453[金属学及工艺—金属表面处理]