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Electro-Chemical Impedance Spectral (EIS) Study of Patinated Bronze Corrosion in Sulfate Media: Experimental Design Approach

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Journal of Materials Science and Chemical Engineering 2017年第10期5卷 44-54页

作者： Aymen Chaabani safa aouadi Nébil Souissi X. Ramón Nóvoa Preparatory Institute For Engineering Studies El Manar University of Tunis El Manar Farhat Hached University Campus of El Manar Tunisia Faculty of Sciences of Bizerte University of Carthage Jarzouna Tunisia ENCOMAT Group E.E.I. University of Vigo Vigo Spain

The aim of the present investigation was to model the experimental conditions of tin bronze patination using full factorial experimental design. In this sense, a full factorial design approach was developed to model the corrosion behavior of patinated tin bronze alloy in sulfate electrolyte. Three experimental factors (the immersion time in the chloride electrolyte, the potential limit for the anodic sweep Elim, and the potential scan rate) were chosen to identify the significant factor on the patina growth process at the bronze substrate. The experimental responses were the kinetic parameters extracted from the electro-chemical spectra (EIS) for eight different experiments. An equivalent electrical circuit containing an electrolyte resistance (Re), a double layer capacitance (CPEdl), a charge transfer resistance (Rt) and Gerischer element (G), was developed to model the patinated bronze corrosion process. The electro-chemical spectra (EIS) show that the corrosion process of the patinated bronze alloy occurred from a chemical reaction is followed by an electrochemical one. Analysis of the experimental responses showed that while the scan rate is the most influent factor for the corrosion potential (Ecorr), the electrolyte resistance (Re), and the double layer capacitance CPEdl variation, the potential limit is the significant factor for charge transfer resistance Rt, reciprocal of the admittance parameter Y0 and the effective transfer rate of the chemical reaction k variation.

关键词： Bronze Corrosion Experimental Design Electrochemical Impedance Spectroscopy Gerischer Impedance

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