The effects of aging temperature on the corrosion and electrical conductivity in the AA7075 alloy produced by powder metallurgy method

Abstract

In this study, the effect of aging temperature of corrosion and electrical conductivity of AA7075 produced by powder metallurgy method was investigated. Produced AA7075 Al alloy samples, obtained by powder metallurgy method, were quenched after solution treatment at 485◦C for 2 h. Then they were aged at three different temperatures (110◦C, 120◦C, and 130◦C) for 24 h. Aged samples hardness and density measurements were carried out and they were characterized by scanning electron microscopy, energy dispersive spectroscopy, and X-ray diffraction. Corrosion tests were carried out using potentiodynamic polarization technique, a cyclic polarization measurement at a scan interval of ±750 mV and scan rate of 1 mV/s in 0.1 M H2SO4 solution. Electrical conductivity values were calculated (IACS%) according to ASTM B193-02 standards. As a result of the study, the highest hardness values were measured with aged samples at 120◦C. In addition, the lowest electrical conductivity and the lowest corrosion resistances values were obtained with aged samples at 120◦C.