摘要
利用交流微弧氧化装置对AZ91D镁合金在1组分、2组分、3组分和4组分电解液中进行了微弧氧化处 理,并通过电化学测试技术研究了微弧氧化处理后膜层的耐蚀性能．实验结果表明:能显著提高镁合金耐蚀性能的 微弧氧化电解液,多为含NaAlO2组分的碱性溶液;电解液中添加H2O2和C4H4O6Na2等组分,可进一步提高膜层的 耐蚀性．微弧氧化处理后,膜层表面光滑、均匀、致密,并由尖晶石结构的MgAl2O4相和MgO相组成．NaAlO2组分的 存在,能与膜层中的MgO相在微弧氧化过程中一起烧结形成具有尖晶石结构的MgAl2O4耐蚀相,从而提高镁合金 的耐蚀性能．
AC microarc oxidation technique was used to process AZ91D magnesium alloy in electrolytes of one, two, three and four components respectively. The corrosion resistance of microarc coatings was measured electrochemically. The results showed that the optimal electrolytes, which can greatly improve the corrosion resistance of magnesium alloy, mainly consisted of NaOH and NaAlO2 components. The corrosion resistance of microarc coatings could be increased further by the addition of H2O2 and C4H4O6 Na2 components. The coating formed on AZ91 D alloy was smooth, uniform and compact, and composed of MgAl2O4 and MgO phases. With the participation of MgO, NaAlO2 promoted the formation of corrosion resistant MgAl2O4 phase during the microarc oxidation process, thus enhancing the corrosion resistance of magnesium alloys.
出处
《天津大学学报》
EI
CAS
CSCD
北大核心
2005年第11期1026-1030,共5页
Journal of Tianjin University(Science and Technology)
基金
教育部留学回国人员科研启动基金资助项目(413175).
关键词
镁合金
微弧氧化
电解液
耐蚀性
magnesium alloy
microarc oxidation
electrolyte
corrosion resistance
