COMPARISON OF THE RUST LAYERS FORMED ON CARBON STEEL BY ACCELERATED CORROSION TESTING IN NaHSO3 AND Na2SO4 SOLUTIONS
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Abstract
Accelerated corrosion tests of immersion-dry-wet combined cycles in 1.0mmol/L NaHSO3 solution and 1.0mmol/L Na2SO4 solution respectively were performed.Corrosion products were analyzed by IR and SEM.The rusts were composed of γ-FeOOH,α-FeOOH,Fe3O4 and δ-FeOOH or FeSO4·7H2O.However the rust layer formed NaHSO3 was loose and corrosion rate was fast,while the rust layer formed in Na2SO4 was dense and corrosion rate was slow.Ferrihydrite had an accelerated action in forming γ-FeOOH and α-FeOOH.
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