采用失重法、极化曲线法研究了咪唑啉与KI的复配缓蚀剂在4%(质量浓度, 下同)柠檬酸溶液中对碳钢的缓蚀协同作用。结果表明, 复配缓蚀剂可有效抑制45#碳钢在柠檬酸溶液中的腐蚀, 当缓蚀剂总浓度为0.4%时, 咪唑啉和KI浓度比为3∶1时缓蚀效果最好。极化曲线表明该复配缓蚀剂为混合型缓蚀剂。

The mixture of imidazoline and potassium iodide as a corrosion inhibitor for carbon steel in 4% (wt) citric acid solution was investigated by weight loss test and polarization curve methods. Results show that the combined inhibitor strongly inhibits the corrosion of 45# carbon steel in citric acid solution and the mixture with the mass ratio undecyl-N-carboxymethyl-hydroxyethy imidzoline (UHCI) :KI of 3:1 has the best corrosion inhibition at a total concentration of 0.4%. The polarization curves indicate that the combined inhibitor behaves as a mixed type inhibitor.