The countless contradictions of practical or theoretical nature associated with the gaseous nitriding process, for a long time, have forced researchers to study in depth the theoretical aspects of the process. The analysis of the main phases of the mass transfer process occurring within the nitriding process led to the conclusion that the phases responsible for the series of noted contradictions are the ones corresponding to the reactions in the environment and at the environment–product interface. Through theoretical studies and experimental verification, it was discovered that, in the reaction space, under the specific conditions for the gaseous nitriding to occur, the ammonia most probably undergoes, in the areas close to the metallic surfaces, at the same time as the thermal catalytic dissociation, an ionization process that is followed as a consequence by the appearance of a greater number of anions and anionic complexes. In this paper are presented the results of the studies and experimental research related to the adsorption’s ionic mechanism on nitriding in a gaseous medium.