一种有机发动机冷却液缓蚀剂复合配方的探讨

Discussion on Organic Inhibitor Formulation in Engine Coolants

在乙二醇-水体系中,以发动机的主要金属部件为主体,对一系列的有机酸缓蚀剂的缓蚀性能进行了探讨。采用电化学极化曲线测试和玻璃器皿腐蚀失重法对其缓蚀性能进行了分析。极化曲线结果表明,有机酸缓蚀剂的缓蚀效果主要通过阳极来实现。结合失重试验结果可知,苯三唑类缓蚀剂在铜表面形成连续的保护膜将消耗铜离子,导致加入该缓蚀剂后铜的腐蚀电位反而下降。研究结果表明:缓蚀剂具有选择性,因此对多种缓蚀剂进行复配,设计出了一种通用的有机配方来实现对多种金属的缓蚀防护,本配方含有一元脂肪酸、二元脂肪酸、唑类化合物及其他添加剂,环保安全、高效全面、寿命长。

A series of organic acids individually used as corrosion inhibitors in ethylene glycol engine coolants was discussed.These acids include aliphatic monoacid,aromatic monoacid,and aliphatic diacid.The methods including cyclic polarization electrochemistry and glassware corrosion of metals were used to analyze the inhibition performance.The results of polarization curves show that the inhibition effect of organic acids is mainly achieved through the anode.Combined with the weight loss test results,copper ion was consumed to form protective film on the surface resulting in corrosion potential of copper decreasing with tolytriazole.This study shows that the inhibitor is selective,so the composite corrosion inhibitor was designed to realize the protection of various metals.It contains monoacid/diacid combinations,oxazole derivatives,and other additives.This organic corrosion inhibitor formula is environmentally safe,long life,efficient and comprehensive.