Abstract
Corrosion rates of AISI 1010 steel samples in coal-water slurries in the presence and absence of chromate, molybdate, and tungstate oxyanion inhibitors were determined by electrochemical and weight loss measurement techniques. The corrosion rates obtained by the electrochemical technique were generally higher than the values obtained by weight loss measurement. The corrosion inhibition efficiencies of chromate, molybdate, and tungstate were almost the same and the shifts infree corrosionpotential suggest that these inhibitors are anodic in nature. Electron microprobe, X-ray photoelectron, and Auger electron data showed the presence of hexavalent molybdenum and tungsten oxides and trivalent chromium oxide species in the films that formed on the surfaces of the samples exposed to solutions containing inhibitor. The amount of inhibitor present in the films decreased in the order chromium > tungsten > molybdenum.
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