Evaluation of some phenothiazine derivatives as corrosion inhibitors for bronze in weakly acidic solution

► Phenothiazine derivatives are efficient inhibitors for bronze corrosion. ► Potentiodynamic polarization and EIS were used to elucidate inhibition mechanism. ► Adsorption of phenothiazine derivatives on bronze surface obeys Langmuir isotherm. ► A correlation between energy gaps and inhibition effic...

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Bibliographic Details
Published in:Corrosion science 2012-10, Vol.63, p.275-286
Main Authors: Bostan, Roxana, Varvara, Simona, Găină, Luiza, Mureşan, Liana Maria
Format: Article
Language:English
Subjects:
A. Bronze
ACIDS
Applied sciences
B. EIS
B. Modelling studies
Bronzes
C. Corrosion
Computational efficiency
Computing time
CORROSION
Corrosion environments
CORROSION INHIBITORS
Corrosion prevention
Derivatives
Exact sciences and technology
Inhibition
Metals. Metallurgy
Phenothiazines
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Summary:► Phenothiazine derivatives are efficient inhibitors for bronze corrosion. ► Potentiodynamic polarization and EIS were used to elucidate inhibition mechanism. ► Adsorption of phenothiazine derivatives on bronze surface obeys Langmuir isotherm. ► A correlation between energy gaps and inhibition efficiencies values was obtained. Four phenothiazine derivatives have been tested as inhibitors for bronze corrosion in a solution containing Na2SO4 and NaHCO3 (pH 5). Electrochemical investigations (potentiodynamic polarisation and impedance measurements) revealed that all phenothiazine derivatives exert a protective effect against bronze corrosion and, in some cases their inhibition efficiency exceeds 90% at concentration level as low as 75μM. An adherent layer of organic molecules chemisorbed on bronze surface is responsible for the protective effect of the investigated compounds. Adsorption of phenothiazine derivatives on bronze obeys Langmuir isotherm. Correlation between quantum chemical calculations and inhibition efficiency of the investigated compounds was discussed using DFT method.
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2012.06.010