| 摘要 |
PROBLEM TO BE SOLVED: To provide a soft-nitriding method for steel by which a compound layer having high quality can be rapidly formed. SOLUTION: In the soft-nitriding method for steel, the steel is cleaned with a preliminary cleaning solution containing a composition comprising 5 to 40 parts by mass of an organic alkali or its salt, 10 to 50 parts by mass of a glycol ether and 0.1 to 5.0 parts by mass of a chelating agent, which is diluted with water and then the cleaned steel is immersed into a salt bath for soft- nitriding. And then the steel taken out of the salt bath for soft-nitriding is cleaned with a finishing cleaning solution containing a composition comprising 5 to 40 parts by mass of an organic alkali or its salt, 10 to 50 parts by mass of a glycol ether and 0.1 to 5.0 parts by mass of a chelating agent, which is diluted with water. After cleaning with the finishing solution, the steel can be dried under a reduced pressure of≤100 Torr. COPYRIGHT: (C)2003,JPO
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