Process for the treatment of ferrous metal parts to improve thei

Details Process for the treatment of ferrous metal parts to improve thei Process for the treatment of ferrous metal parts to improve thei

1992-06-11

1994-09-13

Wyszomierski, George

Metal treatment

Process of modifying or maintaining internal physical...

Carburizing or nitriding using externally supplied carbon or...

148220, 148234, 148251, C23C 840

Patent

active

053465601

ABSTRACT:
Precision ferrous metal parts subject to severe friction and corrosion in e are nitrided, preferably in a bath of molten salts based on CNO.sup.- cyanate ions, oxidized, preferably in baths of molten oxidizing alkaline salts, and then impregnated with a hydrophobic wax. A layer after the nitriding and oxidation steps is formed of a close-packed deep sub-layer and a porous superficial sub-layer ranging in thickness between 5 and 25 .mu.m, and exhibiting through pores ranging between 0.2 and 3 .mu.m in diameter. The impregnation wax is an organic compound with a high molecular weight between 500 and 10,000, with a surface tension in the liquid state ranging between 10 and 73 mN/m, the contact angle between the solid phase of the superficial layer and the wax in the liquid state ranging between 0 and 75.degree. C.

REFERENCES:
patent: 4496401 (1985-01-01), Dawes et al.
patent: 4500564 (1985-02-01), Enomoto
patent: 4704168 (1987-11-01), Salik et al.

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