65. Nitriding is the process of surface hardening of steel by treating it in an atmosphere of [1989]
(a) $NH_3$
(b) $O_3$
(c) $N_2$
(d) $H_2 S$
Show Answer
Solution:
(a) When steel is heated in presence of $NH_3$, iron nitride on the surface of steel is formed which imparts a hard coating. This process is called nitriding.
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