No passwords, No popups, No cost, No AI:
we earn from 'affiliate link' purchases, making the site possible

Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ

finishing.com -- The Home Page of the Finishing Industry

  The authoritative public forum
  for Metal Finishing 1989-2024

-----

Sn plating

finishing.com is possible thanks to our supporting advertisers, including:
this text gets replaced with bannerText

Q. Excuse me, I have a Sn plating solution with white visual. These days, the color of the solution is turning violet, which is an abnormal color. What happened to the solution? Is there another reaction of potassium stannate with other metals besides copper?

Marsella Putri
- Bandung, West Java, Indonesia
June 15, 2022

A. Hi Marsella. Hopefully a tin plater has seen this before and will comment :-)

The only purple reactions with tin that I have heard of is 'purple of Cassius' which is gold plus tin and sounds very unlikely, and a test for tin ions using Cacotheline, which also sounds unlikely.

But please tell us what kind of tin bath you are operating (acid, alkaline, etc.) because such color reactions are usually pH dependent or Sn⁺² vs Sn⁺⁴ dependent, so knowing which you are using might be a large hint.

Luck & Regards,

Ted Mooney, P.E. RET
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
June 2022

Q. I use base solution (K₂SnO₃)

Marsella Putri [returning]
- Bandung, West Java, Indonesia
June 16, 2022

(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: