Electrochemical Impedance Spectroscopy Analysis of 2-Mercaptobenzimidazole (2MBI) as Corrosion Inhibitor in HCl 1M
Electrochemical Impedance Spectroscopy Analysis of 2-Mercaptobenzimidazole (2MBI) as Corrosion Inhibitor in HCl 1M
复制标题
1M HCl 中缓蚀剂 2-巯基苯并咪唑 (2MBI) 的电化学阻抗谱分析
DOI：
10.1149/1.3268421
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
H. Herrera
中科院分区：
文献类型：
--
作者：
A. Espinoza;G. Negrón;M. Palomar;M. Romero;I. R. Torres;H. Herrera
本文研究了一种具有缓蚀性能的有机杂环化合物，即2-巯基苯并咪唑，2MBI在含有暴露于盐酸1M的API5L X52钢样的体系中的不同浓度的影响。阻抗谱表明，随着电解液中缓蚀剂浓度的增加，|Z|不断增大。当浓度为200ppm~2MBI时，缓蚀率最高可达99%，且缓蚀剂浓度较小。这就是认为它在盐酸中是一种很好的缓蚀剂的充分理由，就像它对硫酸有效一样。此外，进行的抑制动力学研究表明，在1M盐酸中加入相当大的浓度200ppm的2MBI，其有效浸泡时间可达32天。此外，还观察到随着体系中2MBI有机分子浓度的增加，腐蚀电位Ecorr变得更负，这表明该缓蚀剂可能作用于阴极和阳极位，因此被认为是混合型缓蚀剂，符合腐蚀混合电位理论。
This work presents the results concerning the effect of different concentrations of an organic heterocyclic compound that displays corrosion inhibiting properties, known as 2-mercaptobenzimidazole, 2MBI, in a system comprising samples of the steel type API 5L X52 exposed to HCl 1M. The impedance spectra revealed that there was a continuous increase of |Z| as a function of increasing inhibitor concentrations in the electrolyte. A 200 ppm 2MBI was tested also, however, the greatest corrosion inhibiting efficiency was attained 99%, IE, with much smaller concentrations of the compound. This is sufficient reason to consider it a good corrosion inhibitor in HCl, just as it was effective for H2SO4. Furthermore, the inhibition kinetics study undertaken indicated that the 2MBI added in a fairly large concentration of 200 ppm in 1M HCl maintains its effectivity up to 32 immersion days. Also, it was observed that the corrosion potential, Ecorr, became more negative as the 2MBI organic molecules concentration increased in the system, which suggests that this inhibitor may be acting on the cathodic and anodic sites, thus being considered a mixed type inhibitor, in agreement with the corrosion mixed potential theory.