Comprehensive model for the activation mechanism of Al–Zn alloys produced by indium
| Autor: | Silvana Beatriz Saidman, Daniel Omar Flamini, J. B. Bessone |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
ALUMINIUM ALLOY
Físico-Química Ciencia de los Polímeros Electroquímica General Chemical Engineering Alloy Inorganic chemistry ACTIVATION MECHANISM chemistry.chemical_element engineering.material Electrochemistry Chloride Adsorption Aluminium alloy medicine General Materials Science Dissolution Chemistry Metallurgy Ciencias Químicas General Chemistry AMALGAM visual_art visual_art.visual_art_medium engineering Amalgam (chemistry) CIENCIAS NATURALES Y EXACTAS Indium medicine.drug |
| Zdroj: | Corrosion Science. 47:95-105 |
| ISSN: | 0010-938X |
| DOI: | 10.1016/j.corsci.2004.05.002 |
| Popis: | Exploratory work on the electrochemical behaviour of the Al-4%Zn alloy in the presence of In3+ in weakly acid chloride and acetic media is reported. It was found that in chloride solutions, active dissolution takes place at very negative potentials (-1.5 VSCE). This significative enhancement in the electrochemical activity of the alloy is described and discussed. The aim of this paper is to explain the relationship between the operating potential (-1.1 VSCE) given by the commercial alloy (basically an Al-Zn-In alloy), its high efficiency, its quasi-uniform attack observed and the enhanced activity found (-1.5 VSCE). An unified model that explains this findings and the activation process of pure Al: by In3+ is proposed. It was found that two activation mechanism are operative on Al: (i) When sufficient amount of In at the interface in quasi-liquid state is present, an In-Al amalgam is responsible for the activation process (-1.5 VSCE). This process is favoured by Zn reach zones that favours In enrichment at the interface by displacement reaction, (ii) At higher anodic potentials (near -1.2 VSCE), the presence of In at the interface facilitates a chloride adsorption process which depolarised the anodic reaction. Fil: Bessone, Jorge Bartolome. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Ingeiería Química; Argentina Fil: Flamini, Daniel Omar. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina. Universidad Nacional del Sur. Departamento de Ingeiería Química; Argentina Fil: Saidman, Silvana Beatriz. Universidad Nacional del Sur. Departamento de Ingeiería Química; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Bahía Blanca; Argentina |
| Databáze: | OpenAIRE |
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