Cyclic potentiodynamic polarization scans were conducted to determined the effectiveness of various combinations of anodic inhibitors in the prevention of pitting in carbon steel exposed to dilute radioactive waste. Chromate, molybdate, and phosphate were investigated as replacements for nitrite, whose effective concentrations are incompatible with the waste vitrification process. The polarization scans were performed in non-radioactive waste simulants. Their results showed that acceptable combinations of phosphate with chromate and phosphate with molybdate effectively prevented pitting corrosion. Chromate with molybdate could not replace nitrite.

Subject
Slurry, Nitrites, Glass, Solubility, Liquids, Nitrates, Phosphates, Washing, Sodium, Corrosion inhibitors, Pitting, Carbon steel, Wastes
Keywords:
Carbon steel, pitting, cyclic potentiodynamic polarization, nitrite, molybdate, chromate
Government work published by the Association for Materials Protection and Performance (AMPP) with permission of the author(s). Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1996
GOV
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