Title:
SALT BATH NITRIDING METHOD FOR METALLIC MEMBER HAVING STRENGTHENED CORROSION RESISTANCE
Document Type and Number:
Japanese Patent JP3748425
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To perfectly dissolve away molten salt on the object to be treated by hot water rinsing in a cleaning stage even as for a part with a complicated shape by performing displacement washing in a salt bath having a specified composition after salt bath nitriding treatment, and to further improve the level of its corrosion resistance by the displacement washing with the salt bath having a specified composition.
SOLUTION: A metallic member is dipped into a salt bath comprising Li+, Na+ and K+ as cation components and CNO- and CO3-- as anion components to form a nitride layer on the surface thereof. In the method where alkali hydroxide, combined water, free water, moist air or the like are added to or impregnated into a salt bath to strengthen the oxidizing power of the salt bath, so that a nitride layer is formed on the surface of a metallic member, and simultaneously, an oxide layer is formed on the outermost surface thereof, the metallic member is dipped into a salt bath comprising alkali nitrate in the stage subsequently to the nitriding salt bath treatment.
Inventors:
Hiroshi Eiraku
Yu Sawano
Yamamura Tetsuya
Kuniharu Yatsushiro
Fumihide Nakamura
Tenmaya Motohiro
Yu Sawano
Yamamura Tetsuya
Kuniharu Yatsushiro
Fumihide Nakamura
Tenmaya Motohiro
Application Number:
JP2002258619A
Publication Date:
February 22, 2006
Filing Date:
September 04, 2002
Export Citation:
Assignee:
Parker Heat Treatment Industry Co., Ltd.
Nihon Parkerizing Co.,Ltd.
Nihon Parkerizing Co.,Ltd.
International Classes:
B05D1/18; C23C8/52; B05D5/00; B05D7/14; C23C8/48; C23C8/80; (IPC1-7): C23C8/52; B05D1/18; B05D5/00; B05D7/14; C23C8/80
Domestic Patent References:
| JP8020877A | ||||
| JP5263214A | ||||
| JP57152461A | ||||
| JP56033473A | ||||
| JP51050241A | ||||
| JP51123734A | ||||
| JP2002226963A | ||||
| JP2002001241A | ||||
| JP2001214126A | ||||
| JP2000510512A |
Attorney, Agent or Firm:
Katsuhiro Yoshida
Toshieko Kondo
Hiroshi Yoshida
Toshieko Kondo
Hiroshi Yoshida