TREATMENT LIQUID FOR FORMING PROTECTIVE FILM OF STEEL MEMBER HAVING NITROGEN COMPOUND LAYER, AND COMPOUND LAYER PROTECTIVE FILM

摘要

PROBLEM TO BE SOLVED: To provide a means for preventing oxidation of a compound layer due to high-frequency hardening, the compound layer being formed on the surface of a steel material by nitriding.

SOLUTION: Treatment liquid for forming compound protective film, which is a non-aqueous treatment liquid for forming a protective film for protecting a compound on a nitride layer formed after the nitriding for steel material. The treatment liquid contains at least one kind of molten metal alkoxide, metal acetylacetonate and/or metal carboxylate selected from the metal group consisting of Si, Ti, Zr, Hf, V, Ta, Ca, Ce, Sc, Nb, Cr, W, Al, Sr, Zn, Mg and Mo.

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