柠檬酸介质中咪唑啉复配缓蚀剂对碳钢的缓蚀作用

摘要

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 g carbon steel in citric acid solution and the mixture with the mass ratio undecyl-N-carboxymethyl-hydroxyethy imidzoline (UHCI) :KI of 8:1 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.%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。