Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Improving throwing power of tin bath


I need to increase the throwing power in an acidic tin process. I use the traditional formulation but my problem is to plate inside a tube with 2 inches in diameter without auxiliary anodes that means I need better throwing power. I am not sure if an alkali formulation should be a good aim.

Thanks in advance.

Jose Cesta
Servico Nacional de Aprendizado Industrial - Sao Bernardo do Campo, Sao Paulo, Brasil


What type of acid tin are you using? We have fluoborate, MSA and sulfate tin processes in our shop, and I find that the sulfate tin has the best throw of all. In fact, with only one anode in the bath, it will throw behind a flat part, coating both sides. Hull cell panels of these baths are coated front and back.

Michael Brewington
plating shop - Salisbury, Maryland, USA


Usually alkaline processes have better throwing power than the corresponding acid process. Alkaline tin has comparable throwing power to cyanide copper.

George Shahin
George Shahin
Atotech - Rock Hill, South Carolina


The problem is as follows: I need to plate tin inside a tube 5 inches long and 2 inches in diameter. I can not aplly auxiliary anodes because I intend to use a automatic line. The only way is to use a tin bath with the best throwing power. My sulfate tin process with nominal strenght do not work well regarding my needs because I have only a few tin in microns in the inside of the tube. Maybe somebody know a good literature about new developments in tin bath?

Thanks in advance,

Jose Francisco Cesta
SENAI - Sao Paulo


You could use non-conductive shielding on the racks to improve throw inside the tubes. If the tubes' ends are facing the anodes, fixture a plastic panel near the end of the tube. The panel could have a hole cut in it that's smaller than the ID of the tube.

Michael Brewington
plating shop - Salisbury, Maryland, USA

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

(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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA