• Venetz, T. J.
• Page, J. S.
• Wyrwas, Richard
• Cooke, G. A.

Abstract

This report summarizes the electrochemical testing results for the aggressive layers testingrecommended by the single-shell tank integrity expert panel. From single-shell chemistry data, 39 layerswere identified as possible aggressive waste layers and were grouped by aggressive ion and inhibitor ions.From those groups 18 segments were identified as representative segments and tested. The testing reportedhere showed pitting corrosion for six aggressive layers, and one layer showed a propensity for crevicecorrosion. In these cases there was a lack of inhibitors, an abundance of aggressive ions, or both. A goodprediction for pitting corrosion could be made by considering the pH value of the layer. When the pH wasless than 12, there was a high probability for pitting to occur. However, the pH of the solution was notalways an indicator, and the inhibitor ion and aggressive ion concentrations then needed to be considered.

Topics

• pitting corrosion
• pH value