磷酸、单宁酸混合型带锈转化液的转化效果

Conversion Performance of Mixed Rust Converter Based on Phosphoric and Tannic Acids

采用浸泡试验结合电化学阻抗谱、扫描电镜等手段,对磷酸、单宁酸复合型转化液锈层转化效果进行了分析.结果表明,转化液中磷酸、单宁酸含量及其比例对锈层转化效果有影响,浸泡试验表明,当转化液中单宁酸含量为0.5％～1％,缓蚀剂含量为1％,渗透剂含量为3％～7％,且渗透剂与磷酸的质量比为0.4～0.6时,锈层的转化效果较佳;电化学阻抗结合显微形貌测试结果表明,锈层经不同转化液处理后,表面磷化膜致密性以及内部锈层的磷化程度不同,同时增加处理液中的渗透剂和缓蚀剂的用量可以提高磷化膜致密性以及内部锈层的磷化程度.

The conversion performance of mixed rust converter based on phosphoric and tannic acids was analyzed by means of immersion test,electrochemical impedance spectroscopy and electron microscopy.The results show that the quality of phosphoricacid,tannic acid and their proportion affect the performance of rust converter.In the immersion test,when tannic acid content was 0.5％-1 ％,penetrant content was 3％-7％,and mass ratio of penetrant and phosphoric was 0.4-0.6,the conversion performance was relatively good.The ectrochemical impedance spectroscopy and electron microscopy tests show that after different converter treatments,the phosphating film densification and internal rust phosphating degree were different.Increasing the penetrant and inhibitor amount can improve the phosphating film compactness and internal rust phosphating degree.