Asparagine as an Eco-Friendly Corrosion Inhibitor for Copper in Nitric Acid: A Gravimetric and Electrochemical Investigation
DOI:
https://doi.org/10.70411/MJHAS.3.1.2026353Keywords:
Corrosion inhibitor, Copper, Amino acids, Asparagine, HNO3Abstract
The corrosion inhibition performance of asparagine (ASP) for copper in 1 M HNO₃ solution was investigated using a combined experimental and theoretical approach. The inhibitory effect of ASP was evaluated through gravimetric measurements, potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS). The results obtained from weight-loss measurements revealed that the corrosion rate of copper decreased significantly in the presence of the inhibitor, reaching a maximum inhibition efficiency of 94% at 10⁻⁴ M. Electrochemical studies confirmed these findings, showing a considerable decrease in corrosion current density and a marked increase in charge transfer resistance with the addition of ASP. Polarization results indicated that asparagine behaves as a mixed-type inhibitor, affecting both anodic and cathodic reactions. EIS measurements revealed the formation of a protective film on the copper surface, as evidenced by the increase in charge transfer resistance and the decrease in double-layer capacitance. The adsorption of ASP molecules on the copper surface was found to be responsible for the inhibition effect.
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