Research Article
Open Access
Carbon steel corrosion inhibition by combined effect of L- Methionine and ZnSO4 in aqueous solution: Electrochemical, FTIR, and Statistical study
V. Prathipa1*, A. Sahaya Raja2
1Department of chemistry, PSNA College Engineering and Technology, Dindigul, Tamilnadu, India
2PG& Research Department of Chemistry, G.T.N. Arts College, Dindigul, Tamilnadu, India
A.Sahaya Raja et al /Int.J. Chemical Concepts. 2021,7(1),pp 11-18.
Abstract
The corrosion and inhibition behaviors of carbon steel in the presence of L-Methionine and
ZnSO4 have been studied using gravimetric method and electrochemical techniques. Results obtained
by various techniques are close to each other and maximum Inhibition efficiency is 93%. Synergistic
parameters and Statistical study of “F” test suggest that a synergistic effect exists between L
Methionine and Zn2+. The protective film on the metal surface has been analyzed by FT – IR spectra. A
suitable mechanism of corrosion inhibition is proposed based on the results obtained from weight loss
study, electrochemical study and surface analysis technique. The inhibitor L-Methionine -Zn2+ system
may find application in cooling water system.
Keywords
Carbon steel, L-Methionine, ZnSO4, synergistic effect, F-Test, FT-IR spectra