Abstract: A rust-converting coating was prepared using 1-hydroxyethylidene-i, diphosphonic acid (HEDP) as rust converter. The influence of HEDP on the anticorrosive performance of coatings was studied via salt spray tests, electrochemical impedance spectroscopy (EIS )tests and analysis. When the mass fraction of HEDP in the coating was 5%, the best anticorrosive effect was obtained. The reaction of HEDP with rust was studied through EDS andFT-IR. The results of EDS showed that the phosphorus was concentrated in the boundary between the rust and the coating when HEDP was added into the coating. The FT-IR showed that HEDP was mainly reacted with the loosened lepidocrocite of must to produce a chelated compound,which further formed a stable protective layer on the steel substrate.

Key words: rust-converting coatings, HEDP;, rust converter: anticorrosive coating;EIS

摘要： 制备了一种以羟基乙叉二膦酸(HEDP)作为锈转化剂的转化型带锈涂料,通过对添加不同质量分数的HEDP的涂料样板的盐雾试验、电化学测试及分析,研究了HEDP作为锈转化剂的带锈涂料的耐腐蚀性能。综合评定HEDP质量分数为5%时,防腐蚀效果最好。利用能谱(EDS)分析和红外光谱(FT-IR)技术,对HEDP的防锈机理和与铁锈的反应情况进行了研究。EDS线扫描结果表明:当HEDP加入到水性涂料中时,磷元素集中在锈层和涂层的交界处;红外测试结果表明:HEDP主要与铁锈中疏松的纤铁矿反应生成螯合物,形成稳定的络合物保护膜,对基底进行保护。

关键词: 带锈涂料, 羟基乙叉二膦酸, 锈转化剂, 防腐蚀, 电化学阻抗谱