Electrochemical investigation of corrosion and repassivation of structural aluminum alloys under permanent load in bending
| Autor: | Monica Trueba, Antonietta Lo Conte, Michele Ferri, Stefano P. Trasatti, Marina Cabrini |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Materials science
elettrochimica Settore ING-IND/22 - Scienza e Tecnologia dei Materiali 020209 energy General Chemical Engineering Alloy chemistry.chemical_element 02 engineering and technology engineering.material ripassivazione Chloride Corrosion Al alloys leghe alluminio prove di flessione Aluminium 0202 electrical engineering electronic engineering information engineering medicine General Materials Science Chemical Engineering (all) Polarization (electrochemistry) Dissolution Open-circuit voltage Metallurgy Chemistry (all) General Chemistry 021001 nanoscience & nanotechnology Microstructure bending load electrochemistry repassivation Materials Science (all) chemistry engineering 0210 nano-technology medicine.drug |
| Popis: | This work reports an electrochemical investigation of corrosion and repassivation in NaCl solutions of structural Al 7075-T6 and Al 2024-T3 as a function of permanent load in bending by means of single-cycle anodic polarization. Experimental variables other than the load level were the extent of corrosion, chloride ion concentration and initial pH of the test solution, in addition to the pre-exposure in the aggressive environment and of the viscosity of the test solution for Al 7075-T6. The susceptibility to local stress during corrosion and repassivation depends on the alloy microstructure and corrosion mechanisms. In the case of Al 2024-T3, the mechanical activation is driven by cathodically controlled dissolution of this alloy at open circuit in concentrated NaCl, being indicative of a chemomechanical effect. Conversely, for Al 7075-T6, the effect of applied load is better discerned from the repassivation response. Film rupture/formation sequence and related interfacial (electro)chemical processes determine the stress-enhanced metastable repassivation of this alloy. |
| Databáze: | OpenAIRE |
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