AZ31镁合金钼酸盐转化膜制备及性能研究

摘要

A molybdate conversion treatment process applied to AZ31 magnesium alloy was introduced.Corrosion behavior of the conversion coating in 5％ NaCl solution were evaluated by electrochemical methods,morphology and composition of the coating were studied by scanning electron microscopy and X-ray diffraction.Results showed that the molybdate conversion coating had a spherical mesh crack structure with MoO2,MoO3 and MoO (OH)2 as main component and had good coverage to basal body.Corrosion resistance evaluation proved that the coating could play a protective role for the basal body.%介绍了一种应用于AZ31镁合金的钼酸盐转化工艺.采用电化学方法评价了转化膜在5％NaC1溶液中的腐蚀行为,利用扫描电镜和X-射线衍射分析了转化膜的形貌和成分.结果表明,钼酸盐转化膜的主要成分是MoO2、MoO3和MoO(OH)2,转化膜呈球型网状结构,覆盖基体良好.耐蚀性能评价证明对基体合金有一定的防护作用.