|
Letter 36093
Stripping Tin over Steel
[Mexico]
+++++
Hi: I'm working with a flat steel piece about half inch wide and
8.5 inches long and 1/16 thick. I'm plating this with a bright acid
tin solution. I'm experiencing some reject because of excess of the
tin thickness. My main problem is that I have not found any
formulation for stripping tin over steel.
Do you have any formulation for this?
Thanks in advance.
Reynaldo Martinez
Plating Shop - Monterrey, Mexico
First of two simultaneous responses -- +++++
Sodium m-nitro benzene sulfonate (aka "Strip-aid") 8 oz/gal plus
NaOH 4 oz/gal, immersion at room temp.
|
|
Jeffrey Holmes,
CEF
- Spartanburg, SC, USA
|
Second of two simultaneous responses -- +++++
Proprietary hot oxidizing alkaline strippers are available from
many suppliers such as
MacDermid, Enthone
Geoff Whitelaw
- Port Melbourne, Vic., Australia
+++++
The simplest way to strip tin from steel is to use 80 g/l sodium
hydroxide at about 85 C. This is the way tin is commercially stripped
from tinplate. Tin is an amphoteric metal and will dissolve in acid
and alkali, but steel doesn't react with alkali, so you will have no
problems here. If you want to strip it back to the steel and it has
been heat treated, there will be an intermetallic layer. This is very
difficult to disrupt but can be done with applying an electric
current.
|
|
Trevor Crichton
R&D practical scientist - UK
|
Dear Reader: please choose what you want to do--
- I want to answer or follow-up on this subject
publicly (in non-commercial
fashion).
-
- My company is a supporting advertiser at
finishing.com and we want the contact information to reach
the inquirer privately.
-
- I want to post a new
question or inquiry of my own on
a different subject.
-
 |