Abstract
The inhibition effect of normal aliphatic acids with 6–10 carbon atoms in the molecule has been investigated in aerated solutions of 0·05m sodium sulphate at 6–12 pH. It was found that the depolarization of oxygen is not the only factor responsible for the passivation of iron in aerated solution containing a critical concentration of the inhibitor. The inhibiting ability of aliphatic acids in Na2 SO4 solutions is brought about by a synergistic action of dissolved oxygen and of molecules (or anions) of the aliphatic acid.
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