Influence of sodium sulphite on corrosion inhibition by the sodium gluconate –Zn²⁺ system

Abstract

The inhibition efficiency of sodium gluconate (SG) in controlling corrosion of carbon steel immersed in the environment containing 60 ppm Cl^– has been evaluated in the presence and absence of Zn²⁺ by weight loss method. SG and Zn²⁺ show a synergistic effect. The protective film has been analysed by FTIR and fluorescence spectra. The protective film consists of Fe²⁺‐gluconate complex and Zn(OH)₂. The film is found to be UV‐fluorescent. The IE of the SG‐Zn²⁺ system increases in the presence of Na₂SO₄; but decreases in the presence of Na₂SO₃ and also in the presence of N‐cetyl‐N,N,N‐trimethyl ammonium bromide. This study reveals that the transporting phenomenon plays a larger role than the scavenging of dissolved oxygen.

Citation

Amalraj, A.J., Sundaravadivelu, M., Pascal Regis, A.P. and Rajendran, S. (2001), "Influence of sodium sulphite on corrosion inhibition by the sodium gluconate –Zn²⁺ system", Anti-Corrosion Methods and Materials, Vol. 48 No. 6, pp. 371-375. https://doi.org/10.1108/EUM0000000006257