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Effect of artificial aging on intergranular corrosion of extruded AlMgSi alloy with small Cu content |
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| Authors: | Gaute Svenningsen Magnus Hurlen Larsen Jan Halvor Nordlien |
| Affiliation: | a Department of Materials Technology, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway b SINTEF Materials and Chemistry, NO-7465 Trondheim, Norway c Hydro Aluminium, R&D Materials Technology, NO-4265 Håvik, Norway d Department of Physics, Norwegian University of Science and Technology, NO-7491 Trondheim, Norway |
| Abstract: | The effect of artificial aging parameters on the corrosion performance of air cooled AlMgSi(Cu) model alloy extrusions was investigated. Accelerated corrosion test revealed that the extrusions were highly susceptible to intergranular corrosion (IGC) in the naturally aged condition. However, IGC susceptibility was reduced, and finally eliminated, by artificial aging. Overaging introduced slight pitting susceptibility. EDS X-ray mapping in FE-TEM revealed Mg2Si and Q-phase (Al4Cu2Mg8Si7) grain boundary precipitates and a continuous Cu-enriched grain boundary film. IGC susceptibility was related to the Cu-enriched grain boundary film. Increased IGC resistance was caused by coarsening of the grain boundary film by aging. Pitting susceptibility by over aging evolved due to coarsening of the Q-phase particles in the grain bodies. |
| Keywords: | A Aluminium A Intermetallics B FE-TEM B STEM C Intergranular corrosion |
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