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Abstract
The aluminum samples were experimented by using potentiostatic polarization method for all the investigated media, ammo-acids, vitamins, sulfuric acid and hydrochloric acid with and without different concentrations of thiourea. The samples were experimented by using quasi-stationary polarization method for only amino-acids solutions. The effects of different concentrations of the investigated amino-acids solutions, glycine, alanine and asparagine and also some vitamins, folic and ascorbic acids on the pitting corrosion potential (Ep were studied.
The corrosion rate of aluminum increases with increasing the temperature of the tested media. The aggrressivity, order of the tested amino-acids toward the pitting of samples is glycine asparagine > alanine and the aggressivity of folic acid is more than ascorbic acid at all tested concentrations for pure aluminum at room temperature.
The inhibition effect of thiourea in 10-5 M hydrochloric-acid was discussed. The pit density formed in 0.001M gi\one depends on the temperature. The pits generated in the investigated amino-acids, vitamins
and in 10-5 M. hydrochloric acid with and without -iiiurent concentrations of thiourea were photographed by light microscope