Electrochemical Study of the Effect of Adding Molybdate and Nitrate on the Corrosion of Carbon Steel in Diluted Artificial Seawater

Abstract

The effect of adding Na₂MoO₄ and NaNO₃ was investigated in diluted artificial seawater as countermeasures for suppressing corrosion of internal structures after the accident at the Fukushima Daiichi Nuclear Power Station. Addition of Na₂MoO₄ suppressed the anodic reaction, suggesting that the addition decreased the corrosion current density for carbon steel. Addition of NaNO₃ suppressed the anodic reaction while accelerated the cathodic reaction, suggesting that the addition might accelerated the corrosion. Mixed addition suppressed the anodic and cathodic reaction, suggesting that the mixed addition decreased the corrosion current density.