Abstract
Abstract This is an electrochemical evaluation of a chemical inhibitor on the corrosion behavior of mild steel (ASTM A-414) in solutions containing 54 percent lithium bromide and 0.2 percent lithium hydroxide at 25 C (77 F). Inhibiting effects of lithium chromate at concentrations up to 3000 ppm were studied Results are analyzed in terms of corrosion current determined from polarization resistance measurements and cathodic and anodic polarization slopes. These are compared with weight loss measurements. The system inhibited with lithium chromate behaved as expected. Corrosion current, determined from polarization resistance, decreased steadily with increasing inhibitor concentration to a limiting value above 1000 ppm. Relative corrosion rates (ratio of corrosion rate of steel in the inhibited solution to that in the uninhibited solution) agree reasonably well with weight loss measurements. Extrapolations of Tafel slopes from cathodic and anodic polarization curves to the corrosion potential suggest that in the lithium chromate inhibited system, the anodic reaction controls; whereas in the uninhibited solution, cathodic and anodic processes are equally important and lead to mixed control. Severe pitting of the steel and gel formation have been observed in a number of experiments involving lithium chromate. Hence, proper chemistry involving inhibitor concentration and alkalinity control is very critical.
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