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Synergistic Inhibition of Potassium Chromate and Sodium Nitrite on Mild Steel in Chloride and Sulphide Media

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Author(s): Ayo Samuel AFOLABI

Journal: Leonardo Electronic Journal of Practices and Technologies
ISSN 1583-1078

Volume: 6;
Issue: 11;
Start page: 143;
Date: 2007;
Original page

Keywords: Synergistic | Inhibition | Chloride and Sulphide Media

ABSTRACT
The corrosion inhibition of mild steel in 3.5M sodium chloride and 0.3M sodium sulphide media using varied concentrations of potassium chromate and sodium nitrite was investigated in the study using the conventional weight loss measurement method. The results obtained show that potassium chromate produced a better inhibition performance than sodium nitrite in both media. This is attributed to cathodic and anodic inhibitive effects produced by the chromate ions as compared to only anodic inhibition in nitrite ions. Higher concentrations of these reagents also produced more inhibition in both environments under study. The combination of these inhibitors also produced an enhanced inhibition on the mild steel in the two media. This is attributed to synergistic action of these inhibitors which considerably reduced the cathodic and anodic activities thus promoting a continuous and protective film on the material within these media.
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