What Fluoride Concentration is used in Zinc Phosphate solutions for steel?
Do zinc phosphate solutions for finishing steel parts typically contain fluoride? If so what is the approximate concentrations?Tom Mort
- Grand Rapids, Michigan
Fluoride is not normally required for steel phosphates, but may well be present to allow processing of non-ferrous metals and make the process "more aggressive" on some steels. If fluoride is present it would be typically in the range 0.5-1.5 g/l. It could be present as F only or as SiF6, BF4 or a combination of these.
Hope this helps,Roger Bridger
- Croydon, UK
To my knowledge, no, the phosphating bath as such does not include fluorides. But some phosphating systems use a [potassium-Titanium Fluoride] in the previous rinse tank, which works as a metal activator for the phosphate crystal build up.Vijay Subramanian
- Ann Arbor, Michigan
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