|
Letter 1113
---
Best way to remove chlorides from a high
speed chrome bath.urgent!
Looking for the best way to remove chloride contamination from my
chrome tanks. I'v been in touch with our chemical supply company and
also talked to a competitor about a good solution to this problem,
what I heard from both of these sources was in complete contradiction
to each others methods. Please advise.
Thank you, Jeff Hanaway
Jeff Hanaway
---
The best method that I have found is to do a draw off the bath.
Some people add silver oxide, but this should be done in a
separate tank to ensure that the precipitated silver chloride is
completely filtered out during the transfer back to the plating tank.
I have heard of people dummy plating the chloride out of the tank,
but in an aqueous environment the chloride reacts with the water to
for hypochlorous acid. I have not tried dummy plating to remove
chloride, though.
One could probrably remove the chloride with ion exchange resins,
but that would probrably remove the catalyst also.
John L. Zable
---
Dummy is a good solution to chloride contamination. I do not
remember the excact conditions, but I think it is done with a small
cathode and high current density. I know it works. For more accurate
conditions, try the chatroom, leave a massage for Jim, or send him an
e-mail, he knows the answer for sure.
There is another possibility,to add barium carbonate. The chloride
acts as a catalyst just like sulfate ( actually a stronger one then
sulfate) so by reducing the sulfate, you acctualy reduce the effect
of the chloride. The chloride will decrease with time and then you
will have to increase the sulfate again. It works!
|
|
Sara
Michaeli
chemical process supplier
Israel
|
---
To remove chloride from a chromium plating solution, you can add
silver oxide or silver carbonate. Both methods are expensive due to
the cost of silver salts. Use stoichiometric amounts
Electrolytic dummying of the solution is very effective,
especially if the contamination is high. There are a variety of
recommended electrolytic procedures and one that I am familiar with
(and it works) is to Electrolyze the solution using an anode to
cathode ratio of 10:1 while maintaining an anode current density of
25 ASF.
Trust this helps.
.
Dear sir,
We need the power supply system of electric tank for aluminum
alloy urgently. It must could handle champagne color, and must be
steady. Hope to hear from you soon. Best regards, Yours truly, Tracy
Tracy Fu
- Shenzhen, Guangdong, China
-
-
 | 
Save
This Page (why?) - Home - ©1995-2009 finishing.com
