Abstract
Corrosion rates of AISI 1010 steel both in the presence and absence of sodium tungstate as inhibitor were determined in chloride–sulphate solutions of concentrations typical of water used in coal plants. Corrosion rate data of AISI 1010 steel as a function of pH and sodium tungstate concentration showed that 100 ppm tungstate at pH 8·5 gave 87% inhibition. When associated with other chemical species in a binary or multicomponent system the inhibitor efficiency rose to 99%. Results obtained with sodium tungstate alone or in association with hydroxyethylidene diphosphonic acid (HEDP) and zinc sulphate are presented and discussed. The application of tungstate inhibitor in coal–water slurries has been explored.
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