采用喷淋方法对无铬涂层镀锌钢板进行清洗和磷化等前处理后,采用扫描电镜、能谱仪和低表面电阻测量仪等手段研究了喷淋后无铬涂层的表面形貌、化学成分和附着力性能.结果表明:碱性清洗液pH不大于11.0时,无铬涂层可与碱性清洗液反应产生涂层表面有限的溶胀、溶解,露出更多的锌凸起峰从而提高钢板的导电性能;在磷化处理过程中,随磷酸锌溶液pH的降低,磷酸盐形成量增加,但难以形成扇骨状的磷酸盐晶片,故磷酸液pH应大于3.5.
Spray method was used for pre-treating,such as cleaning and phosphating,the hot dip galvanized steel with chrome-free coating.SEM,EDS and low surface resistance measuring instrument were used to study the surface morphology,chemical composition and adhesion of the chromate-free coating after spray treatment.The results showed that when the pH of alkaline cleaner was lower than 11,chromate-free thin coating might form some limited swelling and dissolving caused by raactrion of the coating with alkaline solution,and the electrical conductivity of the sample was improved by more exposed zinc peaks.During the phosphating process,with the decrease of zinc phosphate solution pH,the amount of phosphate increased,but it was difficult to form fan rib shape phosphate chip,and the pH of phosphate solution should higher than 3.5.
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