No registration, no passwords; no pop-up ads -- just aloha, fun, & authoritative answers.
As an eBay Partner & Amazon Affiliate we receive compensation for qualifying purchases.
Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site
pub  Where the world gathers for
plating, anodizing, & finishing Q&As since 1989





-----

Tin Fluoborate plating bath info




Regarding tinplate manufacture, I have a couple of questions:

1. With the stannous fluoborate bath, is it acidified to prevent hydrolysis to SN(OH)BF4? Is sulfuric acid used for this purpose?

2. What is the E0 value for the reduction reaction involving BF4- ions?

I am a school student (Year 12) and have not been able to find this information anywhere, so I would be really happy if you could help.

PLEASE HELP ME! I know it's your free time too, but I'm really desperate, my local library is no help, and I have only had one opportunity to go to a university library. I can't get there again, and this is the only place on the internet where I could find this topic besides companies' websites, which are in general useless to students. So please reply as soon as possible - the time zone difference delays not only you reading this message, but also me receiving any replies. THANKS VERY VERY MUCH.

Catherine Forrester
- Australia
1999


Fluoboric acid is the acid used. It is added according to titration and the manufacturers specifications. Tin can be plated from a sulphate solution as well (no fluoborate, is cheaper and is functional. The fluoborate bath offers a few properties that some people prefer over the sulphate bath. I have no idea what the Eo is. I believe it will vary slightly with the pH.

James Watts
- Navarre, Florida
1999



The Eo for the tin in the +2 valence state (at one N) is -0.136; I'm not sure is this answers your inquiry though.

Regards,

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
1999


What is a common range of thicknesses for the tin layer plated? Is 0.00034 mm possible? I may have made a huge error in calculating. Have I?

Catherine Forrester
- Australia
1999



Yes, I think you did, Catherine. This sounds somewhere between 1/10 and 1/100 of the thickness I would have expected.

Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
1999



It should be possible to calculate the E(0) value from the value for Sn2+ -> Sn, and the formation constant for the stannous fluoborate complex. I believe that this value can be found in Meites Handbook of Analytical Chemistry [affil link on Amazon], which any good sized library ought to have.

dave wichern
Dave Wichern
Consultant - The Bronx, New York
1999




(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"