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Substituted phenols as corrosion inhibitors for copper in nitric acid
Author(s) -
Fouda A. S.,
Mohamed A. K.
Publication year - 1988
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19880390105
Subject(s) - catechol , resorcinol , chemistry , copper , nitric acid , corrosion , adsorption , phenols , inorganic chemistry , polarization (electrochemistry) , cathodic protection , langmuir adsorption model , organic chemistry , electrode , electrochemistry
The dissolution of copper in nitric acid solution in the presence of resorcinol, o, p‐aminophenols, catechol, o‐cresol and salicylaldehyde as corrosion inhibitors has been studied by galvanostatic polarization and weight loss methods. For these compounds the two methods gave consistent results. Polarization data suggest that in the case of these inhibitors the cathode is preferentially polarized under the influence of an external current. The inhibitors appear to function through general adsorption following the Langmuir adsorption isotherm. The inhibiting effect of tested compounds is due to the destruction of the HNO 2 formed and its interference with the cathodic reaction.