The inhibition of nickel corrosion by means of 3-methyl-1-butyne-3-ol (H), its halo-derivatives and 1-octyn-3-ol (OCT) has been studied by solution analysis, polarization 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 tested additives are similar to those determined in the case of iron acid corrosion. It is assumed that on both metals they form polymeric films with the same mechanism. These compounds are more efficient in the hydrochloric acid solution than in the sulphuric one. OCT is more efficient than H; however the efficacy of the latter molecule can be improved by the substitution of the acetylenic hydrogen atom with halogen atoms, chiefly iodine, that affords an high inhibiting action on the anodic reaction.
Inhibition of acid corrosion of nickel by acetylenic alcohols
FRIGNANI, Alessandro;MONTICELLI, Cecilia;TRABANELLI, Giordano
1998
Abstract
The inhibition of nickel corrosion by means of 3-methyl-1-butyne-3-ol (H), its halo-derivatives and 1-octyn-3-ol (OCT) has been studied by solution analysis, polarization 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 tested additives are similar to those determined in the case of iron acid corrosion. It is assumed that on both metals they form polymeric films with the same mechanism. These compounds are more efficient in the hydrochloric acid solution than in the sulphuric one. OCT is more efficient than H; however the efficacy of the latter molecule can be improved by the substitution of the acetylenic hydrogen atom with halogen atoms, chiefly iodine, that affords an high inhibiting action on the anodic reaction.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
