| Summary: | Different steel alloys of tool steel and alloy steel were heat treated with different heat treatment processes such as hardening, gas carburizing, and gas nitriding. The electrochemical behavior, especially corrosion characteristics, of the different steel grades were evaluated using different electrochemical techniques in 0.1 M sodium chloride solutions at different values of solution pH. Potentiodynamic scans indicated similar corrosion behavior between the different heat treatment processes. However, the nitriding process added extra corrosion resistance to certain steel alloys which included strong nitride forming elements. Also, the electrochemical impedance spectroscopy and salt spray tests confirmed the same and indicated an increase in corrosion resistance after the nitriding process. Keywords: Heat treatment, Corrosion, Nitriding, Carburizing, EIS
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