-- The Home Page of the Finishing Industry

on this site
current topics
The world's most popular metal finishing site, and the internet's friendliest corner

topic 17315

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   


Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2019, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.