聚磷酸盐预膜剂的预膜机理和预膜条件研究

A Study of Mechanisms and Effect of Polyphosphate Prefilming Agent

从聚磷酸盐和锌盐的成膜机理出发，研究了影响聚磷酸盐预膜剂预膜效果的因素。试验结果表明，最佳的预膜条件为：预膜剂浓度８００ｍｇ／ｌ，聚磷酸盐：锌盐＝２．５：１，预膜液中Ｃａ２＋１００ｍｇ／ｌ，ｐＨ＝６～７，常温预膜４８ｈ。在该条件下预膜的试片经工业性试验测试结果表明其抗腐蚀率可达７５％。

From mechanism of polyphosphate producing protection film, study effect of prefilm.The results of experiment indicated that the best condition of prefilm is density 800mg/l , polyphosphate :zinc salt=2.5:1 ,Ca 2+ density 100mg/l, pH 6-7, 48h in constant temperature.