Abstract
Abstract To study the pitting characteristics of two nickel-based alloys in aggressive acidic environments, potentiodynamic anodic polarization of Alloy 600 (UNS N06600) and Alloy 601 (UNS N06601) was carried out in the presence of various concentrations of sodium chloride (NaCl) in 0.1 M sulfuric acid (H2SO4) at 30°C, 60°C, and 90°C. It was found that the addition of NaCl increased the corrosion rate and critical current density for passivation of both alloys significantly. Potentialrelated parameters like open-circuit potential (OCP) and pitting potential (Epit) were also shifted in the active direction with the increase of NaCl concentration. The pitting potential for Alloy 601 was almost 200 mV more positive than that for Alloy 600 in the presence of a particular concentration of NaCl. With the increase of temperature from 30°C to 90°C, the pitting attack on both alloys became more pronounced.
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