酰胺醚类酸洗缓蚀剂在1M盐酸中的缓蚀行为研究

以烟酰胺基甲基醚(NAME)为一种新型酰胺醚类缓蚀剂,采用失重实验、电化学阻抗、极化曲线和量子化学计算等技术,研究了在1M盐酸溶液中对Q235碳钢的缓蚀作用和机理。实验结果表明,随着NAME浓度的增加,缓蚀效率变大最高可达94.8%,吸附行为符合Langmuir吸附等温式;极化曲线结果表明,NAME是一种阴极抑制为主的混合型缓蚀剂;单容抗弧表明腐蚀过程为电荷转移步骤控制;量子化学计算结果表明,吸附活性中心是杂环、N、O原子上。

Inhibition Performance of Amide Ether Inhibitor for Q235 Steel in acid

Inhibition performance and mechanism of nicotinamide methyl ether (NAME) against Q235 mild steel were investigated as corrosion inhibitor in 1M HCl solution by using gravimetric method, electrochemical impedance spectroscopy (EIS), and polarization curve and quantum chemical calculation. Results show that inhibition efficiency (IE) increases with the increase of NAME concentration, and the highest inhibition efficiency is 94.8%. The adsorption of NAME follows Langmuir adsorption isotherm. Polarization curve reveals that NAME is mix-type inhibitor. Single capacitive loop in the Nyquist plots reveals that corrosion is a charge transfer controlled process. Quantum chemical study shows that heterocycle, nitrogen and oxygen atoms are adsorption centers.