Abstract

DHEER, Neelu et al. Synergistic Inhibition Effect of 3-Carboxypyridine and Potassium Iodide on Mild Steel Corrosion in H₂SO₄: Electrochemical and Surface Analyses. Port. Electrochim. Acta [online]. 2024, vol.42, n.1, pp.59-70.  Epub Feb 29, 2024. ISSN 0872-1904.  https://doi.org/10.4152/pea.2024420104.

The effective inhibition of MS corrosion in H2SO4 by CP and CP + KI was assessed by EIS. SM of MS was studied using SEM and AFM. The rise in Rct and decrease in Cdl, with higher C of CP only and CP + KI, confirmed MS CI. IE (%) increased with higher C of CP only and CP + KI (from 10-3 to 10-1 M). CP’s maximum IE (%) was 93.9%, at 10-1 M. CP + KI, due to I- ions synergistic effect, showed an IE (%) of about 98.8% at 10-1 M. CP only and CP + KI adsorption mechanism followed Langmuir’s isotherm. SM studies suggested that a barrier film of CP only and CP + KI, mitigated MS surface corrosion. CP + KI is an efficient inhibitor in H2SO4.

Keywords : AFM; corrosion; CP; EIS; IE (%); KI; MS; SM; SEM.

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