Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
-----
Fall of Sn2+ in tin plating bath
I have been running a 550 gallons tin electro refining prototype without filtration system since 22 feb. The Sn2+ content was 20g/l at the beginning. The solution turned from clear, brown, green then milky. The Sn2+ content is 7g/l. Does it has anything to do with the oxidation of Sn2+ to Sn4+ by air? Are tin impure soluble anodes supposed to supply Sn2+ in order to maintain the current?
Brigitte Peck Ki LaouResearch - Canada
2007
Your Sn2+ is being oxidised to Sn4+ by air. Whilst may Sn2+ salts are soluble, there are not so many Sn4+ ones and they often form insoluble SnO2 or Sn(OH)4, which is a dirty milky white colour
Trevor Crichton
R&D practical scientist
Chesham, Bucks, UK
2007
The Sn2+ usually can be oxidized to sn4+, is there any good method or anti-oxidizer to prevent the oxidation of Sn2+ by the air?
Alan Loo Sai Len- Malaysia
September 29, 2008
(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
Q, A, or Comment on THIS thread -or- Start a NEW Thread