摘要
为改善氟锆酸盐电解液的老化现象,以氟锆酸盐为主电解液,在其中加入少量NaH2PO4和H3PO4,对AZ31镁合金进行等离子体电解氧化处理,制得氧化锆陶瓷薄膜。用扫描电镜、X射线衍射及能谱分析检测了添加剂对陶瓷薄膜的形貌特征、元素及物相组成的影响。结果表明:添加剂改变了电解液体系的放电特性,能有效抑制氟锆酸盐电解液的老化;添加剂的加入能够提高膜中氧化锆的含量,且降低了F在膜中的含量。制得的氧化锆薄膜能有效提高AZ31镁合金的耐腐蚀性能。
In order to improve the aging of fluorozirconate electrolyte, zirconia ceramic coatings were fabricated on AZ31 magnesium alloys by plasma electrolytic oxidation in a potassium fluorozirconate electrolyte solution with sodium dihydrogen phosphate and phosphoric acid as additives. The effects of additives on the surface characteristics, element contents and phase composition of the coatings were investigated by scanning electron microscopy, X-ray diffraction and energy dispersive X-ray spectroscopy. The results indicate that the discharge characteristics of the electrolyte system are changed by additives, which can effectively restrain the aging of the potassium fluorozirconate electrolyte. The amount of ZrO2 was increased and that of F was decreased in the coatings by mixing additives into the electrolyte. The formed zirconia coating could effectively improve the corrosion resistance of the AZ31 magnesium alloy.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2009年第5期783-787,共5页
Journal of The Chinese Ceramic Society
基金
广东省科技计划项目(2005B50101001)
关键词
陶瓷薄膜
等离子体电解氧化
氧化锆
镁合金
ceramic thin film
plasma electrolytic oxidation
zirconia
magnesium alloy
