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AA7075 alloys susceptibility to exfoliation corrosion is related to distribution and size of precipitate within grain boundary, continuity within grain boundary and electrochemical behaviour. Distribution and size of precipitate in the grain also effects the conductivity of the material. The effect of different temperatures and time periods of RRA temper on exfoliation corrosion of AA7075 alloy is examined in this study. Exfoliation corrosion (EXCO) solution was prepared in accordance with ASTM G34‐97 standard and the samples were kept in the solution for 48 h. After the samples were processed in the solution, the susceptibility of the alloy to exfoliation corrosion, its electrical conductivity and pH values of the solution were determined using microstructure scanning. It was determined that exfoliation corrosion resistance value and electrical conductivity changed in relation to chosen temperature and time of RRA temper.

In this paper, the effects of process parameters on the recycling efficiency of used aluminium beverage cans (UBCs) were investigated. In the experimental studies, separated internal workshop scraps and used aluminium beverage cans are used as charge materials for melting process. Aluminium beverage cans are thin walled parts and produced with high Mg content aluminium alloys. Thus its high oxidation affinity reduces recycling efficiency of the cans. Used can pieces were pressed to obtain briquettes for charging. To increase the recycling efficiency and to optimize the process conditions, preheating, pre-charging, and fluxing were applied. The optimum parameters that provide the maximum recycling efficiency were determined. Chemical analyses and tensile tests were carried out with the resulting as cast samples.