Method of phosphating metal surface with zinc phosphate

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

C - Chemistry, Metallurgy

23

C

148/17

C23C 22/36 (2006.01) C23C 22/12 (2006.01) C23C 22/77 (2006.01) C23C 22/86 (2006.01)

Patent

CA 2032541

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 ~ 500 mg/l upon converting into a HF concentration and to contain a fluoride complex in a range shown in the following formula; Image and also, it is adjusted in an active fluorine concentration so as to be 15 ~ 130 µ 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.

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