Abstract
AbstractElectrochemical technologies, chemical immersion tests and surface detection technologies were adopted to study the inhibition performance of Na3PW12O40 inhibitor on carbon steel in 55 % LiBr + 0.07 mol/L LiOH solution, and the inhibition mechanism was discussed. Results indicated that Na3PW12O40 inhibitor caused the decrease of both anodic and cathodic polarization current density and a widening of the passive potential region. It behaved as a mixed inhibitor. When the concentration of Na3PW12O40 in 55 % LiBr + 0.07 mol/L LiOH solution was 300 mg/L, excellent inhibition performance on carbon steel was obtained. When the solution temperature were 145°C, 160°C, 180°C and 200°C, respectively, the corrosion rates of carbon steel were 13.07 μm/y, 17.74 μm/y, 24.55 μm/y and 73.52 μm/y accordingly. Na3PW12O40 inhibitor exhibited an excellent inhibition performance at high temperature. Na3PW12O40 is a strong oxidant. Fe was oxidized to Fe2O3 and itself was deoxidized to heteropoly blue. By this mechanism, an integrate compact passive film mainly comprising Fe2O3 may be formed on the carbon steel surface, and the corrosion of carbon steel in 55 % LiBr solution may be retarded by this passive film.
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