盐酸介质中聚醚改性七甲基三硅氧烷对碳钢的缓蚀研究

Corrosion inhibition of polyether modified heptamethyltrisiloxane for mild steel in hydrochloric acid medium

本文研究了三种聚醚改性七甲基三硅氧烷(分别简称为TEO-13、TEO-23和TEO-29)的缓蚀性能。通过静态失重筛选出缓蚀效果较好的聚醚硅氧烷,利用动电位扫描极化曲线及SEM考察了最优化的聚醚硅氧烷在1.0mol·L-1盐酸中对20#碳钢的缓蚀效果,并对缓蚀机理进行了探讨。结果表明:合成的聚醚改性七甲基三硅氧烷对碳钢在HCl介质中表现出优异的缓蚀效果,其中TEO-23的缓蚀效果最好,当达到0.9g·L-1的浓度时,腐蚀速度降为5.9g·(m2·h)-1,缓蚀效率为94.1%。扫描电镜显示TEO-23可在碳钢表面形成致密完整的吸附保护膜,阻碍碳钢的腐蚀。极化曲线表明,该表面活性剂属于阴极型缓蚀剂。

The inhibition behavior of polyether modified heptamethyltrisiloxane(TEO-13、TEO-23 and TEO-29)for mild carbon steel in 1.0mol·L-1HCl medium was investigated.Via weight loss measurement,the most effective corrosion inhibitor was choosed.And the inhibition behavior of the best one was investigated by means of polarization curve plotting and scanning electron microscopic(SEM).Also the inhibition mechanism of the inhibitor was discussed.The rsults showed that polyether modified heptamethyltrisiloxanes had good corrosion inhibition for mild steel,and TEO-13 had excellent inhibition performance of them at a concentration of 0.9g·L-1,recording an inhibition efficiency of 94.1% and a corrosion rate of 5.9g·(m2·h)-1.SEM observation indicated that a compact adsorption film was formed on the surface of the mild steel,which accounted for the effective corrosion inhibition.Moreover,it was seen from the polarization curve that polyether modified heptamethyltrisiloxane could be classified as a cathodic inhibition.