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首页> 外文期刊>Corrosion science >Formation and properties of stannate conversion coatings on AZ61 magnesium alloys
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Formation and properties of stannate conversion coatings on AZ61 magnesium alloys

机译：AZ61镁合金上锡酸盐转化膜的形成和性能

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摘要

The effects of solution composition and temperature on the microstructure and corrosion resistance of stannate conversion coatings on AZ61 magnesium alloys were investigated. The conversion coating consisted of a porous layer as under layer intimately contacted with the magnesium plate and a hemispherical particle layer as major overlay formed right on top of the porous layer. During the coalescence of the hemispherical particles to form a complete coating on the magnesium alloy, some sites of discontinuity inevitably left and determined the corrosion resistance of the coating evaluated using a salt spray test. Increasing bath stannate ion concentration and lowering bath pH increased the population density of the hemispherical particles whose size was accordingly reduced. The corrosion resistance of the conversion coating was improved with finer particles, which were preferably formed at less alkaline solution with higher stannate ion contents. Furthermore, the conditions favoring the formation of finer particles also reduced the immersion time necessary for producing the conversion coating with optimal corrosion resistance.
机译：研究了溶液组成和温度对AZ61镁合金锡酸盐转化膜组织和耐蚀性的影响。转化涂层由与镁板紧密接触的作为下层的多孔层和作为主要覆盖层的半球形颗粒层直接形成在多孔层的顶部上组成。在半球形颗粒聚结以在镁合金上形成完整涂层的过程中，不可避免地会留下一些不连续点，并确定了使用盐雾试验评估的涂层的耐腐蚀性。浴锡酸根离子浓度的增加和浴pH值的降低会增加半球形颗粒的种群密度，该半球形颗粒的尺寸会相应减小。用更细的颗粒改善了转化涂层的耐腐蚀性，更细的颗粒优选在碱金属含量较低的碱性溶液中形成。此外，有利于形成较细颗粒的条件还减少了生产具有最佳耐腐蚀性的转化涂层所需的浸渍时间。

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