微弧氧化电解液中加入Al2O3胶体对AZ91D复合陶瓷层性能的影响

Influences on properties of AZ91D composite ceramic layer formed in electrolyte adding Al2O3 colloid

摘要:

在硅酸盐体系中加入Al2O3胶体对AZ91D镁合金进行微弧氧化，研究了Al2O3胶体的加入时间和加入量对陶瓷层组成、结构以及耐蚀性的影响。结果表明，约在硅酸盐体系微弧氧化6min（总氧化时间10min）时加入Al2O3胶体生成的复合陶瓷层耐蚀性最好；随Al2O3胶体用量的增加陶瓷层的腐蚀速度明显减小，当过量加入对陶瓷层的腐蚀性能提高不明显。

Abstract:

Ceramic coating was fabricated on AZ91D magnesium alloys by micro-arc oxidation in silicate system which was added Al2O3 colloid, influences of adding time and amount on chemical composition, microstructure and corrosion resistance of the MAO ceramic coatings were studied. The results showed that the ceramic coating which was formed by adding Al2O3 colloid at about 6min (the total oxidation time was 10min) performed the best corrosion resistance; and the corrosion rate was reduced evidently with the increase of Al2O3 colloid dosage, however, the performance of corrosion resistance was hardly influenced when used excessive dosage