摘要
在铝酸盐体系溶液中对AZ91镁合金进行微弧氧化处理,用扫描电镜对所得不同厚度的微弧氧化膜层形貌进行观察;通过盐雾试验进行耐腐蚀性能测试;用X射线衍射仪进行膜层成分分析。结果表明:镁合金微弧氧化膜层在初期膜层表面平整,微孔尺寸小、密度大、分布均匀,随着膜厚增加膜层致密性提高,微孔数量减少,但表面粗糙度增加,耐蚀性能随膜厚的增加呈现先增加后降低的变化规律,膜厚在20～30μm时膜层具有较好的耐蚀性,膜层主要由MgAl2O4和MgO两相组成。
AZ91 micro-arc oxidation treatment was proceed in the aluminate solution. The surthce microstructure was observed by stereoscan, and the salt spray test was proceed on the samples of micro-arc oxidation coating with different thickness. The composition of the coating was analyzed by X-Ray diffractometer. The res-alts indicate： in the initial, the Mg alloy micro-arc oxidation coating surface is smooth, and the micro-holes are very small in uniform distribution. With the increase of coating thickness, the coating density irnproves, while the number of micro-hole decreases, but the surface roughness increases, and the corrosion resistance increases. Thickness of 20-30 μm coating has a better corrosion resistance. The film mainly consisting of MgAlzO4 and MgO is a two-phase composition.
出处
《热加工工艺》
CSCD
北大核心
2012年第24期170-172,共3页
Hot Working Technology
关键词
镁合金
微弧氧化
耐蚀性能
magnesium alloy
micro-arc oxidation （MAO）
corrosion resistance
