Corrosion Inhibition of Mild Steel in Aqueous Solution Containing H2S by some Thiosemicarbozone Compounds

• Published in: Materialwissenschaft und Werkstofftechnik Vol. 31; no. 2; pp. 175 - 183
• Main Authors: Barakat, Y. F., Hassan, A. M., Baraka, A. M.
• Format: Journal Article
• Language: English
• Published: Weinheim WILEY-VCH Verlag GmbH 01-02-2000; WILEY‐VCH Verlag GmbH; Wiley-VCH
• Subjects: Applied sciences; Corrosion; Corrosion prevention; Exact sciences and technology; Metals. Metallurgy; Polarization diagram; Hydrogen Sulfides; Thiosemicarbazone; Concentration effect; Carbon steel; Aqueous solution; Corrosion protection; Sodium chloride; Corrosion inhibitor; Organic compounds
• ISSN: 0933-5137; 1521-4052
• DOI: 10.1002/(SICI)1521-4052(200002)31:2<175::AID-MAWE175>3.0.CO;2-3

The Electrochemical behavior of mild steel in 3% NaCl is still the objective of many studies which include the investigations of natural and synthetic compounds as inhibitors. In this paper, some derivatives of thiosemicarbazone compound were investigated as inhibitors in medium of 3% NaCl for the mild steel samples. The galvanostatic technique was used in this study to characterize both cathodic and anodic behaviour of mild steel. the percent of inhibition P.I. was calculated for each of thiosemicarbazone compounds in order to determine the effectiveness of these undertesting compounds. As estimated the P.I. was increased with the concentration of each of undertesting compound. In addition the mild steel was tested in 3% NaCl in presence of H2S. So the synergistic effect of each inhibitor manifests itself for the tested compounds. It was found that the change of the methoxy group position has an active role in the inhibition effect of the tested compound. From others side the introduction of chloro group has also a beneficial inhibition effect.