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无铬耐指纹镀锌钢板在40℃的碱性溶液和35℃的磷酸锌溶液中分别喷淋2 min,用扫描电镜、能谱仪和低表面电阻测量仪分析了喷淋后无铬耐指纹涂层的形貌和成分,并探讨了喷淋后无铬耐指纹镀锌钢板的烤漆性能。结果表明:无铬耐指纹涂层与碱液发生反应导致涂层表面有限度的溶胀、溶解,露出更多的锌凸起峰从而提高了钢板的导电性能。在磷酸锌溶液喷淋处理时,无铬耐指纹涂层受到酸液的侵蚀而发生局部性剥落,露出的镀锌层与磷酸锌溶液反应生成了磷酸盐。随磷酸锌溶液酸度的增大,磷酸盐形成量呈增加的趋势,但无铬耐指纹涂层重量的增加对钢板表面磷酸锌的生成有明显的抑制作用。随钢板表面磷酸盐的生成量的增加,其烤漆层耐冲击性能出现明显的下降。
Chromium-free fingerprint-resistant galvanized steel was sprayed in alkaline solution at 40 ℃ and zinc phosphate solution at 35 ℃ for 2 min respectively. The chrome-free fingerprint after spraying was analyzed by SEM, EDS and low surface resistance meter The morphology and composition of the coating, and explores the paint performance of chromium-free fingerprinting galvanized steel after spraying. The results show that the reaction between chromium-free fingerprint-resistant coating and alkaline solution causes the surface of the coating to swell and dissolve to a limited extent, revealing more zinc protuberances and thus increasing the electrical conductivity of the steel sheet. Zinc phosphate solution spray treatment, chromium-free fingerprint-resistant coating by acid erosion and the occurrence of local spalling, the exposed zinc coating and zinc phosphate solution generated phosphate. With the increase of acidity of zinc phosphate solution, the amount of phosphate formation tends to increase, but the increase of weight of chromium-free fingerprint-resistant coating has a significant inhibitory effect on the formation of zinc phosphate on the surface of steel sheet. With the increase of phosphates on the steel surface, the impact resistance of the paint layer obviously decreases.