Synergistic corrosion inhibition behavior of rare-earth cerium ions and serine on carbon steel in 3% NaCl solutions

Abstract

The synergistic inhibition effect of CeCl₃ (Ce) and serine (Ser) on the corrosion of carbon steel in a 3% NaCl solution was investigated by electrochemical methods and surface analysis. The results showed that both CeCl₃ and Ser, when used alone, had limited inhibition effect toward carbon steel corrosion in the 3% NaCl solution. In contrast, the combination of CeCl₃ with Ser produced a strong synergistic effect on the corrosion inhibition behavior of carbon steel, improving the inhibition efficiency significantly. The polarization curves showed that the mixture of CeCl₃ and Ser acts as a cationic-type inhibitor. Scanning electron microscopy and Fourier transform infrared spectroscopy showed that the synergistic inhibition effect was due to complex formation between the cerium ions and amino acid molecules.

Keywords

synergistic inhibition effect / rare earth / complex / amino acid

References

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