eng Oriental Scientific Publishing Company Material Science Research India 0973-3469 2018-04-20 15 1 91 99 7022 article Influence of Potential Scan Rate on Corrosion Behaviour of Heat Treated AA 7075 Alloy in Sulphuric Acid Solution Neeraj Kumar 1 Manoranjan Kumar Manoj 2 M. Kalyan Phani 1 Department of Metallurgical and Materials Engineering, OP Jindal University, Raigarh, India. Department of Metallurgical Engineering, National Institute of Technology, Raipur, India.

In this paper, the effect of scan rate on the corrosion parameters and electrochemical behaviour of Retrogression and Re-aging (RRA) heat treatment of 7075 aluminium alloy has been investigated by Potentiodynamic polarization (PD) and electrochemical impedance spectroscopy (EIS) methods. The Potentiodynamic polarization (PD) curves were obtained at various scan rates for aged aluminium alloys in 0.5 M H2SO4 solution. The results show that at high scan rates shows unpredicted fluctuation of charging current, whereas at lower scan rates fewer disturbances are observed. The aged samples were chemically and mechanically characterized. It was observed that the RRA at 0.7 h shown improved corrosion property as well as mechanical properties compared to T6 temper. The corrosion properties were confirmed by EIS and polarization experiments.

 https://www.materialsciencejournal.org/vol15no1/influence-of-potential-scan-rate-on-corrosion-behaviour-of-heat-treated-aa-7075-alloy-in-sulphuric-acid-solution/ Alumiunm alloy Corrosion Heat treatment Potentiodynamic polarization Potential scan rate