Enhancement of pitting corrosion resistance for AA1050 processed by continuous closed die forging
| Autor: | S H Luis Hernández, H A Jorge Díaz, José-María Cabrera, Jessica Calvo, L R Sandra Rodríguez, Alexander P. Zhilyaev, Francisco G. Pérez-Gutiérrez |
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| Přispěvatelé: | Universitat Politècnica de Catalunya. Departament de Ciència i Enginyeria de Materials, Universitat Politècnica de Catalunya. PROCOMAME - Processos de Conformació de Materials Metàl·lics |
| Rok vydání: | 2020 |
| Předmět: |
lcsh:TN1-997
Materials science Plasticity 02 engineering and technology Enginyeria dels materials [Àrees temàtiques de la UPC] 01 natural sciences AA1050 Forging Corrosion Biomaterials Plasticitat 0103 physical sciences Ultimate tensile strength Pitting corrosion Mechanical behavior Composite material lcsh:Mining engineering. Metallurgy 010302 applied physics Metals and Alloys 021001 nanoscience & nanotechnology Microstructure Surfaces Coatings and Films Severe plastic deformation Vickers hardness test Ceramics and Composites 0210 nano-technology Electron backscatter diffraction |
| Zdroj: | UPCommons. Portal del coneixement obert de la UPC Universitat Politècnica de Catalunya (UPC) Journal of Materials Research and Technology, Vol 9, Iss 6, Pp 13185-13195 (2020) |
| ISSN: | 2238-7854 |
| DOI: | 10.1016/j.jmrt.2020.09.065 |
| Popis: | The pitting corrosion of an aluminum alloy AA1050 after being processed by continuous closed die forging (CCDF) was evaluated by cyclic potentiodynamic polarization (CPP). Microstructure evolution, mechanical and corrosion behaviors were studied as a function of the total strain imposed. The CCDF process was carried out at 0, 16 and 24 passes with loading times of 10 and 15¿s. The electron backscatter diffraction (EBSD) analysis revealed a grain refinement of 0.78¿µm after 24 passes, which promoted an increment in the yield strength (YS), ultimate tensile strength (UTS) and vickers hardness (HV) by a factor of 9, 3 and 2 respectively; but the uniform strain and strain to rupture decreased by 93% and 72% respectively. Resistance to corrosion after 16 and 24 passes was compared with the reference material (0 passes), using CPP in a Na2S04 0.1¿mol/l +100¿mg/l of NaCl electrolyte. Results showed that the specimens with 24 passes decreased its corrosion rate one order of magnitude. In addition, specimens with very fine grain sizes have shown nobler pitting potential and lower pitting volume fraction than coarse grain specimens. |
| Databáze: | OpenAIRE |
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