华中科技大学学报：自然科学版2011，Vol.39Issue(8)：27-31,5.
镁合金微弧氧化Y2O3-ZrO2-MgO膜制备及性能
Preparation and performance of Y2O3-ZrO2-MgO composite coating on magnesium alloy by microarc oxidation
摘要
Abstract
Composite ceramic coating containing Y2O3-ZrO2-MgO（Al-Zr-Y） was prepared on AZ91D magnesium alloy by microarc oxidation in K2ZrF6-Y（NO3）3-NaAlO2 electrolyte. The composition and structure of the coating were studied by SEM （scanning electron microscope）, EDS （energy dispersive spectrometer） and XRD （X-ray diffraction）; meanwhile, the corrosion resistance and thermal stability of the coating were tested by means of potentiodynamic polarization and high temperature oxidation, etc. The results show that the composite ceramic coating is mainly composed of Y2O3, ZrO2, MgO, and Al2O3. Al-Zr-Y coating is thinner but more compact and smooth than Si-P coating prepared in Na2SiO3-（NaPO3）6 electrolyte. Compared with Si-P coating, the corrosion current density of Al-Zr-Y coating decreased, while the corrosion potential and polarization resistance increased. The corrosion rate in 5% NaCl solution decreased, which is about 1% of that of AZ91D. The high temperature oxi dation and thermal shock resistance of Al-Zr-Y coating is better than that of Si-P coating.关键词
AZ91D镁合金/微弧氧化/Y2O3-ZrO2-MgO复合陶瓷膜/腐蚀性能/耐热性Key words
AZ91D magnesium alloy/microarc oxidation/Y2O3-ZrO2-MgO composite coating/corrosion resistance/thermal stability分类
矿业与冶金引用本文复制引用
蔡启舟,刘峰,严青松,罗强..镁合金微弧氧化Y2O3-ZrO2-MgO膜制备及性能[J].华中科技大学学报：自然科学版,2011,39(8):27-31,5.基金项目
南昌航空大学轻合金加工科学与技术国防重点学科实验室开放基金资助项目（gf200901002）. （）
