期刊名称：Journal of Materials and Environmental Science
印刷版ISSN：2028-2508
出版年度：2013
卷号：4
期号：5
页码：583-592
出版社：University of Mohammed Premier Oujda
摘要：Electrochemical impedance spectroscopy (EIS), potentiodynamic polarization and gravimetric, techniques were carried out to investigate the corrosion protection properties of ammonium iron (II) sulphate (AIS) on carbon steel in 1 M HCl solution. The EIS study indicated that the addition of AIS in corrosive medium increases the charge-transfer resistance (Rct), decreases the double-layer capacitance (Cdl) of the corrosion process, and hence increases the inhibition performance. Potentiodynamic polarization measurements showed that the presence of AIS in 1 M HCl solutions decreased corrosion currents to a great extent. The above results showed that AIS acted as a mixed-type corrosion inhibitor. Moreover, the thermodynamic activation parameters for the corrosion reaction were calculated and discussed in relation to the stability of the protective inhibitor layer. Adsorption of inhibitor was found to obey Langmuir isotherm. The thermodynamic parameter value of free energy of adsorption (οad sG.) reveals that inhibitor was adsorbed on the carbon steel surface via both physisorption and chemisorption mechanism
