超声波对镁铝水滑石膜表面沉积铈盐转化膜的影响  

Influence of ultrasonic wave on deposition of cerium-based conversion coating on Mg alloy with Mg-Al hydrotalcite film

作　　者：陈永俊[1] 吕小雨 马彪[1] 张成[1] 董强胜 巴志新[1,2] 

机构地区：[1]南京工程学院材料工程学院,江苏南京211167 [2]江苏省先进结构材料与应用技术重点实验室,江苏南京211167

出　　处：《材料热处理学报》2017年第8期123-127,共5页Transactions of Materials and Heat Treatment

基　　金：江苏省大学生实践创新训练计划资助项目(201611276072H);南京工程学院大学生科技创新基金(TB201702016);江苏省普通高校研究生科研创新计划项目(SJZZ16_0292)

摘　　要：采用超声辅助在AZ91D镁合金镁铝水滑石膜表面制备铈盐转化膜以提高其膜层的耐蚀性,利用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)分析膜层形貌及成分,极化曲线和交流阻抗测试评价膜层的耐蚀性,研究了超声波功率对镁铝水滑石膜表面沉积铈盐转化膜的影响规律。结果表明,当超声功率为150 W时,镁铝水滑石膜微裂纹处沉积了铈盐转化膜,表现出良好的铈盐封闭效果,提高了膜层的耐蚀性。In order to improve the corrosion resistance of Mg-Al hydrotalcite film of AZ91D Mg alloy,cerium-based conversion coating was prepared on its surface by ultrasonic wave.Surface morphology and chemical composition of the coating were analyzed by means of scanning electron microscopy（SEM）,energy dispersive spectrometer（EDS） analysis and X-ray diffraction（XRD）,and its corrosion resistance was evaluated by the polarization curves and electrochemical impedance spectroscopy（EIS） test.The influence of ultrasonic power on the deposition of cerium-based conversion coating on Mg-Al hydrotalcite film was investigated.The results show that when the ultrasonic power is 150 W,cerium-based conversion coating is deposited into the micro-cracks of Mg-Al hydrotalcite film,and show a good cerium-based sealing effect,and the corrosion resistance of the coating is improved.

关 键 词：AZ91D镁合金 镁铝水滑石膜 铈盐转化膜 超声波 耐蚀性 

分 类 号：TG178.2[金属学及工艺—金属表面处理]