Abstract
Aiming to simulate the internal corrosion of pipeline and oil tank steels exposed to decanted waters, the electrochemical behavior and corrosion morphology of these steels was studied in 10-2 mol/L Na2SO4 solutions, with additions of naphthenic acids in dependence of the inclusions distribution. A linear correlation between the pitting potential in sulfate solutions and inclusions concentration of -20mV x Inclusions Density (inclusions/mm2) could be determined. The localized attack associated to the sulfide inclusions turns increasingly to a more uniform attack, as the concentration of the naphthenic cyclopentanecarboxylic acid in the dilute sulfate solution is increased.
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