Effects of sulfide ions on the integrity of the protective film of benzotriazole on alpha brass in salt water

The addition of sulfide ions to a solution of 0.58 M NaCl containing benzotriazole (BTAH) results in a decrease of the inhibiting efficiency of BTAH and a momentary increase of the dissolution rate of alpha brass at potentials above the corrosion potential. The effect depends on the sulfide ion conc...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2000-05, Vol.147 (5), p.1767-1769
Main Authors: ASHOUR, E. A, HEGAZY, H. S, ATEYA, B. G
Format: Article
Language:English
Subjects:
Applied sciences
BRASS-ALPHA
CATALYTIC EFFECTS
Corrosion
CORROSION INHIBITORS
Corrosion prevention
CORROSION PROTECTION
ELECTROCHEMICAL CORROSION
Exact sciences and technology
MATERIALS SCIENCE
Metals. Metallurgy
PROTECTIVE COATINGS
SULFIDES
TRIAZOLES
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Summary:The addition of sulfide ions to a solution of 0.58 M NaCl containing benzotriazole (BTAH) results in a decrease of the inhibiting efficiency of BTAH and a momentary increase of the dissolution rate of alpha brass at potentials above the corrosion potential. The effect depends on the sulfide ion concentration and the potential selected for the tests. The results are explained by decomposition of the protective Cu(I)BTA film, caused by the extraction of Cu(I) ions from the film and formation of Cu sub 2 S: nS exp 2- + 2[Cu(I)BTA] sub n - > nCu sub 2 S + 2nBTA exp - . The breakdown of the film allows metal dissolution from the bare surface and further promotes the effects of sulfide ions.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.1393432