Corrosion inhibition properties of 4-methyl-2-(methylthio)-3-phenylthiazol-3-ium iodide on the carbon steel in sulfuric acid medium

• M. Zebida^1,2, O. Benali³, U. Maschke² and M. Trainsel⁴

¹ Département de chimie, Faculté des sciences, Université de Tlemcen, Algérie
² Unité Matériaux et Transformations: Ingénierie des systèmes polymères (UMET:ISP), Université Lille1, France
³ Département de Biologie, Faculté des sciences, Université de Saïda, Algérie
⁴ Unité Matériaux et Transformations, École Nationale Supérieure de Chimie de Lille1, Université Lille1, France

Abstract: Weight loss measurement and electrochemical techniques were used as the methods for studying the inhibition effects of 4-methyl-2-(methylthio)-3-phenylthiazol-3-ium iodide (ST1) on carbon steel corrosion in 0.5 M H₂SO₄. The results reveal that corrosion rate of carbon steel decreases with addition of ST1 in 0.5 M H₂SO₄. The corrosion rate and inhibition efficiency were found to depend on the concentration of the inhibitor. Inhibition efficiencies up to 99% can be obtained. The polarization data indicated that the inhibitor was of mixed type, with predominant effect on the cathodic partial reaction. Changes in impedance parameters (charge transfer resistance, R_t, and double layer capacitance, C_dl) confirm that corrosion inhibition was due to adsorption on the metal surface following the Langmuir adsorption isotherm. The results obtained from the three different techniques were in good agreement. The influence of the immersion time shows that the inhibiting molecules form a stable and efficient film. XPS analyses clearly show that the adsorption mechanism of ST1 on the carbon steel surface in 0.5 M H₂SO₄ solution is mainly physical adsorption.

Keywords: C38 steel, EIS, polarization, acid corrosion, XPS

Int. J. Corros. Scale Inhib., 2019, 8, no. 3, 613-627 PDF (1 078 K)
doi: 10.17675/2305-6894-2019-8-3-11

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