Effect of benzotriazole on surface processes during copper electrodissolution in sulfuric acid

Journal Article · Tue Jan 01 04:00:00 EST 1991 · Journal of the Electrochemical Society; (United States)

DOI:https://doi.org/10.1149/1.2085552· OSTI ID:6359199

Clerc, C; Alkire, R ^[1]

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1. Dept. of Chemical Engineering and Materials Research Lab., Univ. of Illinois, Urbana, IL (US)

This paper reports on the impedance spectra obtained during anodic dissolution of copper in 0.5M H{sub 2}SO{sub 4} and 40 mM benzotriazole (BTA) at 25{degrees} C. The spectra were evaluated according to the hypothesis that the electrode is covered with a barrier film having a stoichiometric composition through which the current is transported by ionic conduction. This barrier film is itself covered with an outer porous film of corrosion products. The experimental impedance spectra were fit to the model with a nonlinear least squares program. A detailed analysis of the physical parameters obtained with this procedure suggested that the metallic ions transfer through the barrier film, which is likely to be hydrated copper sulfate or contains a non-negligible amount of BTA, under high-field conduction. Experiments carried out at the mass-transfer limiting current in the absence of BTA suggested that the electrode was also covered with a similar dual salt film, the inner layers of which, however, has a different chemical composition than in the presence of BTA.

• OSTI ID: 6359199
• Journal Information: Journal of the Electrochemical Society; (United States), Journal Name: Journal of the Electrochemical Society; (United States) Vol. 138:1; ISSN JESOA; ISSN 0013-4651
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
AZOLES
CHEMICAL REACTIONS
CHEMISTRY
COPPER
CORROSION
CORROSION PRODUCTS
DISSOLUTION
ELECTROCHEMICAL CORROSION
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
HETEROCYCLIC COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
SULFURIC ACID
TRANSITION ELEMENTS