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Abstract
The effectiveness and materials compatibility of malonic acid as a decontamination and chemical cleaning reagent has been explored. Comparison with its homologous oxalic acid demonstrates that malonic acid is a milder reagent, that dissolves the oxide scales more slowly but at acceptable rates, and provides better conditions for base metal protection. The mechanism of attack of malonic acid onto magnetite involves an autocatalytic process, mediated by ferrous ions. The rate is extremely sensitive to the concentration of this ion, and therefore the solution redox potential indirectly determines the rate of attack.
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