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The corrosion behavior of 18% Ni M250 grade maraging steel under weld aged condition has been investigated in hydrochloric acid medium. The studies were carried out in hydrochloric acid solutions of different concentrations (0.1 M – 2 M) at different temperatures (30 0C – 60 0C) by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) techniques. The results showed that the corrosion rate increased with the increase in temperature and with the increase in the concentration of hydrochloric acid in the corrosion medium. Activation parameters were evaluated using Arrhenius equation and transition state equation. The results from the two techniques are in good agreement. The surface morphology of the corroded specimen was compared with that of the un-corroded one by using scanning electron microscopy (SEM).

Corrosion Behavior of 18% Ni M250 Grade Maraging Steel under Weld Aged Condition in Hydrochloric Acid Medium