Ecofriendly Corrosion
Inhibitor for Controlling Corrosion of CS Immersed in Hydrochloric Acid Solution
Sulochana S., John Amalraj A., Syed Abuthahir S.S., Shek Dhavud S. and Sundararajan
G.
Res. J. Chem. Environ.; Vol. 29(2); 1-11;
doi: https://doi.org/10.25303/292rjce01011; (2025)
Abstract
The corrosion inhibitor's effect on carbon steel (CS) corrosion in 1N hydrochloric
acid was investigated in this work. The inhibitor was derived from a water-based
Trichosanthes cucumerina Linn plant extract (TCPL). The primary goal was to ascertain
the efficacy and environmental safety of this technique. Our evaluation was based
on the mass loss method. An inhibitory efficacy of 86.63% was achieved using this
strategy. The mechanisms of corrosion inhibition have been investigated using electrochemical
methods including PDP and EIS. Inhibition efficacy and corrosion rate are both affected
by inhibitor concentration. There is equal regulation of the anodic and cathodic
processes in the mixed-inhibitor inhibitor system. The findings of the PDP study
corroborate this. The corrosion current and the resistance to linear polarisation
may both be efficiently reduced by inhibitors.
When inhibitor systems are present on metal surfaces, electrochemical impedance
investigations have shown that a protective covering, called the blanket effect,
arises. A decrease in double layer capacitance and an increase in charge transfer
resistance have been noted. The process of the protective layer's creation on the
CS surface was explained by an FTIR investigation. Molecular bonds are formed between
the metal and the active component, causing this process to occur. We used SEM and
AFM to look at the protective layer's surface morphology. Comparing CS's surface
element composition to those of blank, polished and inhibitor systems was done using
EDAX technology. The results of the research could be useful for the acid-pickling
industry.
