热浸镀锌层在中性盐雾试验中的防腐性能研究

采用2种定制的热浸镀锌试件，经5000 h中性盐雾试验后发现镀层防腐性能存在显著差异.采用镀锌层厚度损耗测试法、X射线衍射分析法（XRD）和扫描电镜分析法（SEM）分别测试了镀层的厚度损耗量、盐雾试验前后的晶体物质组成和腐蚀前后的微观形貌.研究表明:2种热浸镀锌试件在盐雾腐蚀过程中的产物和机理相似，而影响其防腐性能的主要因素为热浸镀锌的生产工艺、腐蚀产物的致密程度.

Anti Corrosion Performance of Hot dip Galvanized Coating During Neutral Salt Spray Test

Two hot-dip galvanized products are applied onto the steel substrates, then the specimens are tested for 5000h by the neutral salt spray and there are obvious differences in the anti-corrosion performance between the coatings. The thickness loss of coatings, crystal material compositions and microstructures of the coatings are analyzed by Zinc coating thickness loss test method, differential scanning calorimetry (DSC), and X-ray diffraction analysis (XRD). The results show that there is no significant difference of the corrosion products and corrosion mechanisms between two coatings. Nevertheless, the hot-dip galvanized production process, the degree of densification of the corrosion products in coating are the primary factors influencing the anti corrosion performance of the hot-dip galvanized coating.