标题：Thermodynamic, Electrochemical and Quantum Chemical Investigation of Thiomorpholin-4-ylmethyl-phosphonic Acid as Corrosion Inhibitor of Iron in Sulphuric Acid Solution
期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2016
卷号：7
期号：4
页码：1252-1266
出版社：University of Mohammed Premier Oujda
摘要：The inhibiting action of thiomorpholin - 4 - ylmethyl - phosphonic acid (TMPA) was investigated as the corrosion inhibitor of iron in 0.5M sulphuric acid (H 2 SO 4 ) solution with the aid of potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS) and weight loss measurements. The results revealed that thiomorpholin - 4 - ylmethyl - phosphonic acid (TMPA) is a good, mixed type inhibitor. The inhibitio n efficiency of TMPA on iron corrosion increases with increase in concentration of (H 2 SO 4 ) and decreases with increase in temperature. The adsorption isotherm model of TMPA on the iron surface was in conformity with Langmuir isotherm model. Thermodynamic p arameters were calculated and discussed. The local reactivity, analyzed by using Parr functions, shows that both sulphur and nitrogen atoms of TMPA are the main adsorption sites.
