期刊
JOURNAL OF DISPERSION SCIENCE AND TECHNOLOGY
卷 44, 期 2, 页码 329-341出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/01932691.2021.1947852
关键词
Corrosion inhibitor; adsorption; acid corrosion; interfaces; quantum chemical calculations
Pyrazinecarboxamide has been found to effectively inhibit the corrosion of mild steel in 0.5M HCl solution. It adsorbs onto the steel surface following Langmuir adsorption isotherm, with a high proportion of pyrazinecarboxamide being present. The inhibition efficiency of 93.5% was observed in an acid solution containing 1.0mM pyrazinecarboxamide.
Pyrazinecarboxamide was examined against mild steel corrosion in 0.5M HCl solution. The electrochemical techniques like electrochemical impedance spectroscopy, linear polarization resistance and potentiodynamic polarization measurements were carried out in the presence of various concentrations of pyrazinecarboxamide ranging from 0.25mM to 1.0mM. The inhibition effect of pyrazinecarboxamide on the mild steel surface was studied by atomic force microscopy and scanning electron microscopy. The adsorption of this inhibitor was determined to fit Langmuir adsorption isotherm. The adsorption/desorption equilibrium constant was calculated as 2.985x10(4)M(-1), indicating that high proportion of pyrazinecarboxamide takes place on mild steel surface. The inhibition efficiency was found as 93.5% from electrochemical impedance spectroscopy measurement in an acid solution containing 1.0mM pyrazinecarboxamide. Quantum chemical parameters that were in good agreement with experimental results were determined by density functional theory. [GRAPHICS] .
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