Inhibition of acid corrosion of nickel by acetylenic alcohols

Abstract

The inhibition of nickel corrosion by means of 3-methyl-1-butyne-3-ol (H), its haloderivatives, and 1-octyn-3-ol (OCT) has been studied by solution analysis, polarisation curve recording, and electrochemical impedance spectroscopy in deaerated 1N HCl or H₂SO₄ solutions at 70°C. It has been found that the inhibiting effects of the additives tested are similar to those determined in the case of iron acid corrosion. It is assumed that on both metals the inhibitors form polymeric films by the same mechanism. These compounds are more efficient in the HCl than in the H₂SO₄ solution. Inhibitor OCT is more efficient than H, but the efficacy of the latter can be improved by replacing the acetylenic hydrogen atom with halogen atoms, chiefly iodine, which provide higher inhibition of the anodic reaction.

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