The Synergistic Effect of Iodide and Sodium Nitrite on the Corrosion Inhibition of Mild Steel in Bicarbonate–Chloride SolutionReportar como inadecuado


The Synergistic Effect of Iodide and Sodium Nitrite on the Corrosion Inhibition of Mild Steel in Bicarbonate–Chloride Solution


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Department of Chemistry, Physics and Mechanical Engineering, Queensland University of Technology, Brisbane QLD 4000, Australia





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Academic Editor: Richard Thackray

Abstract The effect of potassium iodide KI and sodium nitrite NaNO2 inhibitor on the corrosion inhibition of mild steel in chloride bicarbonate solution has been studied using electrochemical techniques. Potentiodynamic polarisation data suggest that, when used in combination, KI and NaNO2 function together to inhibit reactions at both the anode and the cathode, but predominantly anodic. KI-NO2− concentration ratios varied from 2:1 to 2:5; inhibition efficiency was optimized for a ratio of 1:1. The surface morphology and corrosion products were analysed using scanning electron microscopy SEM and X-ray diffractometry XRD. The latter shows that the addition of I− to NO2 facilitates the formation of a passivating oxide γ-Fe2O3 as compared to NO2− alone, decreasing the rate of metal dissolution observed in electrochemical testing. The synergistic effect of KI-NO2− inhibition was enhanced under the dynamic conditions associated with testing in a rotating disc electrode. View Full-Text

Keywords: mild steel; bicarbonate solution; polarization; EIS; iodide ion; passivation mild steel; bicarbonate solution; polarization; EIS; iodide ion; passivation





Autor: Gaius Debi Eyu * , Geoffrey Will, Willem Dekkers and Jennifer MacLeod

Fuente: http://mdpi.com/



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