Process of producing phosphate coatings

Details Process of producing phosphate coatings Process of producing phosphate coatings

1987-10-07

1989-09-19

Niebling, John F.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

106 1414, C25D 1300

Patent

active

048678538

ABSTRACT:
Disclosed is a process of producing a phosphate coating on a composite part consisting of steel and galvanized steel, which comprises alkaline cleaning, rinsing with an aqueous rinsing bath, and phosphatizing with an aqueous zinc phosphate solution. The formation of a non-uniform coating and of spots is avoided in the process of the invention by the use of a rinsing bath which contains at least 0.2 g/l alkali borate, at least 0.1 g/l alkali silicate and at least 0.05 g/l alkali nitrite, and which preferably contains said components in a total up to 5 g/l.
If the composite part is to be activated with an activating bath which contains titanium phosphate before being contacted with the zinc phosphate solution, the activating bath must contain at least 1 g/l and preferably up to 4 g/l of tetraalkalipyrophosphate.
The process of the invention can be used to prepare composite parts of steel and galvanized steel for subsequent painting, particularly by electrophoretic dip painting.

REFERENCES:
patent: 2815328 (1957-12-01), Green
patent: 3007817 (1961-11-01), Cavanagh et al.
patent: 3960676 (1976-06-01), Miyosawa
patent: 4311535 (1982-01-01), Yasuhara
patent: 4539051 (1985-09-01), Hacias
Chemical Abstracts, vol. 100, "Cleaning, Degreasing and Activation of Metal Surfaces", Morlock, R. (1984).

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