Process for phosphating steel parts to improve corrosion and wea

Details Process for phosphating steel parts to improve corrosion and wea Process for phosphating steel parts to improve corrosion and wea

1993-02-08

1995-02-14

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148254, 148218, C23C 2278, C23C 856

Patent

active

053891619

ABSTRACT:
After preliminary treatment of their surfaces, the parts are brought into contact within a solution containing, essentially, protons, phosphate anions and cations chosen from Ca.sup.2+, Sn.sup.2+ and Mn.sup.2+. The preliminary treatment results in the formation, on the surface, of a layer that comprises, per 1000 atoms, at least 150 atoms of free iron and from 5 to 150 atoms of sulphur, and has a porosity defined by an actual surface area to macroscopic surface area ratio of at least 20. According to an embodiment, these surface characteristics are obtained by nitriding in a bath of molten salts containing sulphur-containing species. According to a second embodiment, these surface characteristics are obtained by nitriding in a bath of molten salts followed by a conventional sulphiding operation. According to a third embodiment, these surface characteristics are obtained by depositing metal, followed by a conventional sulphiding operation.

REFERENCES:
patent: 3912547 (1975-10-01), Gaucher et al.
patent: 4006043 (1977-02-01), Gaucher et al.
patent: 4448011 (1984-05-01), Grellet
Kawksaki Seitetsu K. K., "Production of dead soft cold rolled steel sheet ving excellent phosphate treatability", Patent Abstracts of Japan, Mar. 20, 1986, vol. 10, No. 71.
Shin Nippon Seitetsu K. K., "Cold rolled steel sheet having excellent phosphate treatability and its production", Patent Abstracts of Japan, May 11, 1985, vol. 9 No. 108.

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