Copper corrosion inhibition in acetic acid by some heteroatom organic: case of 1-phenyl-5-mercapto-tetrazole.
2019
Bouchtart, Abdessamad | Rguiti, Mohamed | EL Mouaden, Khadija | Abourine, A. | Salghi, Rachid | Bazzi, Lahcen
Inhibition performance of the heteroatoms organic compounds (HOC), namely Glutamic acid (GA), L-methionine (Meth), Cysteine (Cys) and phenyl mercapto tetrazol (PMT), as copper corrosion inhibitors for copper in 1M Acetic acid was investigated using Potentiodynamic polarization (PP) and electrochemical impedance spectroscopy (EIS) in the current study. The first comparative study distinguished GA and PMT as the best inhibitors from the HOC tested series. The detail study of PMT on the inhibition of the pure copper corrosion in 1M of Acetic Acid (AcA) solution showed that this compound exhibits a higher inhibition efficiency IE% at 5.10-4 M (89 %); moreover, IE% reaches 44 % at low concentration (10-5 M). The PP and EIS measurements indicate that the PMT molecules interacts with the copper surface forming a protective film in order to inhibit the corrosion by a physical chemical adsorption with respect to Langmuir adsorption isotherm model.
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