Search our quarter-million Q&As

Home of the finishing HOTLINE since 1989

-----

Formula for plating sol'n using Chromic acid, Phosphoric acid and Urea?

I am trying to reproduce a plating solution formula we used a long time ago. The only info I can get is that it is 90 chromic acid/10 orthophosphoric acid, with some urea, at saturated concentration in deionized water. Is this a common formulation? Can anyone provide LB/GAL or g/L for the ingredients? Is deionized water a necessity? Can distilled water be used instead? Is there a suitable online source for such information?

Thanks,

Ernie Puskas
- Barberton, Ohio, USA
2003

---

Although you have called this a plating solution, you haven't identified what it is supposed to do. Is it supposedly a chrome plating solution? For decorative, black, or hard chrome? It sounds a bit like an electropolishing solution, and also sounds a bit like a colorizing solution for stainless steel. So what is it that you are trying to do with this solution?

Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
Need quick confidential answers? $25
Need project assistance? $100/hr.
2003

Probably an electropolishing solution. We supply this to an outside contractor for application. They use our material in their process.

Ernie Puskas
- Barberton, Ohio
2003

Sorry! Finishing.com is temporarily Read-Only.
Ted Mooney is retiring but I have several offers to take it over.
We're working hard to make sure we find it the best new home.

---

---