Abstract
The effect of changing the time of immersion and temperature on the electrochemical corrosion behavior of C-250 maraging steel grade in 1.0 M H2SO4 pickling solution was reported. The study was carried out using potentiodynamic polarization, and electrochemical impedance spectroscopy (EIS) investigations. It was found that the increase of immersion time from 10 min to 1 h, 2 h, and 24 h increases the corrosion of the C-250 maraging steel in the acid solution through increasing the corrosion current and corrosion rate, while decreasing the corrosion resistance as was indicated by the polarization measurements. This effect was found to further increase with increasing the temperature of the sulfuric acid solution from 20 degrees to 50 degrees C due to the increase of surface reactivity with temperature. The results obtained by EIS measurements confirmed those ones obtained by potentiodynamic polarization that C-250 maraging steel suffers sever uniform corrosion increases with elongating the immersion time and raising the solution temperature.