Synergistic inhibition effect of sodium silicate and acrylamide on the corrosion of carbon steel in a high-concentration KCl solution

Abstract

The corrosion inhibition performances of sodium silicate(Na₂SiO₃) and acrylamide(AM) for Q235 carbon steel in a high-concentration KCl solution(25%, mass fraction) were investigated via static mass loss method, elec-trochemical measurements, scanning electron microscopy(SEM), X-ray photoelectron spectroscopy(XPS) and Auger electron spectroscopy(AES). AM shows poor inhibition performance, while Na₂SiO₃ exhibits a better inhibition per-formance. Moreover, the steel gains mass instead of losing mass in the presence of 0.5% Na₂SiO₃ and 0.5% AM, in-dicating that the corrosion is completely inhibited. SEM analysis indicates that a compact protective film is formed on the steel surface by the combined use of inhibitors. Our results demonstrate that Na₂SiO₃ and AM could have a synergistic effect on steel corrosion in high concentrations of KCl. The synergistic inhibition mechanism is further conjectured by the XPS and AES analysis.

Keywords

KCl solution / Sodium silicate / Acrylamide / synergistic inhibition effect / Corrosion inhibitor

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