Method for phosphating metal surface with zinc phosphate

Details Method for phosphating metal surface with zinc phosphate Method for phosphating metal surface with zinc phosphate

1990-12-18

1993-05-18

Silverberg, Sam

Metal treatment

Process of modifying or maintaining internal physical...

Processes of coating utilizing a reactive composition which...

148262, C23C 2236

Patent

active

052117693

ABSTRACT:
To treat an iron-based, zinc-based, and an aluminum-based surfaces etc. with zinc phosphate using the same solution, a treating solution is adjusted in concentrations so as to contain a simple fluoride in a range of 200.about.500 mg/l upon converting into a HF concentration and to contain a fluoride complex in a range shown in the following formula; ##EQU1## and also, it is adjusted in an active fluorine concentration so as to be 15.about.130 .mu.A at a value indicated by a silicon electrode meter. Instead of such adjusting aluminum ions in the treating solution is precipitated in an outside of a treating bath to separate them from the treating solution and then, this treating solution may be returned into the treating bath.

REFERENCES:
patent: 4053328 (1977-10-01), Oka et al.
patent: 4265677 (1981-05-01), Muller
patent: 4838957 (1989-06-01), Miyamoto et al.
patent: 4849031 (1989-07-01), Hauffe
EP-381-190-A Aug. 8, 1990.

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