Method for activating surface of metal member

A method for activating the surface of a metal member, that is, activating a passivated coating film present in the surface of a high alloy steel member, which makes it difficult to effect a diffusionpenetration treatment such as a gas nitriding method or a gas carburizing method for forming a nitri...

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Bibliographische Detailangaben
Hauptverfasser: EIRAKU HIROSHI, MIYASHITA MAKOTO, KAWAMURA TAKASHI, KUROSAWA TAKUMI, TOTSUKA TOSHIKO, HOSHINO KAORU, YASHIRO KUNIJI
Format: Patent
Sprache:chi ; eng
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Zusammenfassung:A method for activating the surface of a metal member, that is, activating a passivated coating film present in the surface of a high alloy steel member, which makes it difficult to effect a diffusionpenetration treatment such as a gas nitriding method or a gas carburizing method for forming a nitrided layer, a carburized layer or a carburized and nitrided layer on the surface of a metal member,which method comprises using a gas generally used in a gas heat treatment, forming an HCN gas in a furnace through the utilization of a catalytic action of the surface of a metal to be treated and/ora material of the furnace, to thereby activate the passivated surface of the high alloy steel member. The above method is free from disadvantages such as the formation of deposits in a furnace, the wear of the wall surface in a furnace, and the necessity of the treatment for converting an exhaust gas to a harmless material, which have been problems in the case of a conventional activation treatment using a halogen compound.