The kinetics of the corrosion of aluminium in the orthophosphoric acid aqueous solution was investigated spectrophotometrically and gravimetrically. Sodium molybdate was applied as the inhibitor of the corrosion process. The analysis of the results obtained indicated that there are at least two species that might be useful for the inhibition of the corrosion. These are the products from the reduction of molybdophosphoric acid with aluminium. The mechanism of the inhibition of the corrosion depends on the initial concentration of sodium molybdate.
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