Process of forming phosphate coatings on metals

Details Process of forming phosphate coatings on metals Process of forming phosphate coatings on metals

1989-02-01

1990-08-21

Woo, Jay H.

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

C23C 2217, C23C 2286

Patent

active

049503391

ABSTRACT:
A process to form phosphate coatings on individual parts of metal which at least on part of their surface consists of iron or steel. The individual parts are contacted at a temperature in the range of from 60 to 100 degrees centigrade for 3 to 30 seconds with an aqueous phosphating solution which contains 10 to 80 g/l zinc, 12 to 80 g/l phosphate (calculated as P.sub.2 O.sub.5), 40 to 150 g/l nitrate and, in addition 0.1 to 10 g/l fluoride, 0.01 to 10 g/l nickel, 0.0001 to 0.1 g/l copper, and may also contain tartaric acid, citric acid and/or manganese and in which the ratio of free acid to total acid has been adjusted to (0.1 to 0.3):1 and which contains at least 80 points of total acid and is virtually free of iron(II) ions. Prior to phosphating treatment, the individual parts may be cleaned and may optionally be treated to remove rust, scale and phosphate layers and/or be activated. After the phosphating treatment they may be passivated with an after-rinse solution. Each of said process steps is carried out for 3 to 30 seconds.

REFERENCES:
patent: 3432270 (1969-03-01), Heller
patent: 3516875 (1970-06-01), Rausch
patent: 3519494 (1970-07-01), Engesser
patent: 3520737 (1970-07-01), Gerassimoff
patent: 3617393 (1971-11-01), Nakazawa
patent: 3647568 (1972-03-01), Larson
patent: 3676224 (1972-07-01), Shee
patent: 3723192 (1973-03-01), Oei
patent: 3758349 (1973-09-01), Engesser
patent: 3767476 (1973-10-01), Wagner
patent: 3810792 (1974-05-01), Ries
patent: 3850700 (1974-11-01), Heller
patent: 3860455 (1975-01-01), Hansen
patent: 3939014 (1976-02-01), Reed
patent: 4113519 (1978-09-01), Oka
patent: 4199381 (1980-04-01), Nuss
patent: 4265677 (1981-05-01), Muller
patent: 4338141 (1982-07-01), Senzaki
patent: 4389260 (1983-06-01), Hauffe
patent: 4416705 (1983-11-01), Siemund
patent: 4419199 (1983-12-01), Hauffe
patent: 4596607 (1986-06-01), Huff
patent: 4713121 (1987-12-01), Zurilla
patent: 4717431 (1988-01-01), Knaster
patent: 4719038 (1988-01-01), Sobata
patent: 4824490 (1989-04-01), Oei

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