前处理工艺对无铬涂层镀锌钢板性能的影响
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摘要
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.
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.
引文
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[3]钟彬,徐小莲,陈义庆,等.镀锌板新型环保钝化层的结构和耐蚀性能[J].腐蚀与防护,2010,31(2):139-141.
[4]王静,伍林,宋世红.镀锌产品无铬钝化膜耐蚀性能的研究[J].材料保护,2008,41(11):28-30.
[5]宫丽,卢琳,卢燕平.薄型无铬有机复合涂层钢板耐蚀性的研究[J].材料保护,2008,41(2):68-71.
[6]陈锦虹,卢锦堂,许乔瑜,等.镀锌层上有机物无铬钝化涂层的耐蚀性[J].材料保护,2002,35(8):29-31.
[7]刘小风,曹晓燕.镀锌钢板钝化工艺研究进展[J].腐蚀与防护,2012,33(11):997-1001.
[8]易德莲,王静,李宇鹏,等.镀锌板的复合钝化[J].腐蚀与防护,2010,31(2):142-145.
[9]杨芃,潘燕芳.家用电器热镀锌钢板的无铬耐指纹钝化[J].材料保护,2011,44(2):40-42.
[10]王海燕,李明照,王皓,等.报废镁合金零部件表面涂层去除机理研究[J].太原理工大学学报,2014,45(2):179-183.
[11]林碧兰,孔纲,卢锦堂,等.热镀锌层上磷酸锌转化膜的生长与耐蚀性[J].中国有色金属学报,2007,17(5):800-806.
[12]雷作鍼,胡梦珍.金属的磷化处理[M].北京:机械工业出版社,1992.
[13]宋玉苏,姚树人.涂层与基体金属附着力的研究进展[J].材料保护,1999,32(9):21-22.