Nitriding is a process of heating steel in atmosphere of : — Metallurgy and Isolation of Elements Chemistry Question

💡 Solution & Explanation

Step 1: Nitriding is a thermochemical surface-hardening process used to introduce nitrogen into the surface of steel. Step 2: This is accomplished by heating the steel to a high temperature (typically 500-550°C) in contact with a nitrogen-donating gas. Step 3: Ammonia (NH3) gas is widely used as the nitrogen source because it dissociates on the hot steel surface to release atomic nitrogen, which diffuses into the metal to form hard metal nitrides. This corresponds to option (a).