Aloha, fun & authoritative answers -- no cost, no registration, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Where the
world gathers for metal finishing
Q&As since 1989

-----

Stannate ion in tin plating bath

I know there are a lot of factor with accelerate the stannate ion (Sn4+) forming, can anyone please let me know that the temperature bath temperature (50 °C) is one of the main factors for this problem? Thanks.

Alan Loosai
semiconductors - California
May 11, 2010

Alan,
As you probably already know, gradual oxidation of stannous ions to stannic ions is normal in acid tin plating. Atmospheric oxygen and subsequent hydrolysis forms insoluble metastannic acid [on eBay or Amazon]. I have seen filter systems that were taking in air play havoc with tin baths. Why is your bath temp so high (50 degrees C)? Anyway, there is an antioxidant available for the bath through your supplier that will curb the formation of Sn(4). I can tell you that high temperature does play a role in your problem, but not sure if it is the #1 culprit.

Mark Baker
process engineer - Malone, New York
May 19, 2010

Dear Alan,
Would you please tell me whether you are using Alkaline stannate bath? as I am not clear on your question.

SHANKARANARAYANAN NARAYANASWAMY
- Bangalore, Karnataka, India
June 3, 2010

(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: