Home /
T.O.C.
FAQs
 
Good
Books
Ref.
Libr.
Advertise
Here
Help
Wanted
Current
Q&A's
Search 🔍
the Site

Chime right in! (no registration req'd)

-----

"Atmospheric evaporators/zinc chloride"



 

We are anticipating installing atmospheric evaporators on a zinc chloride plating solution and would like to know what the proper permitting requirements might be. Also, if you know of any problems we may encounter, that would be helpful!

Thanks!

G Zyskowski
metal finishing shop - Paterson, New Jersey
^


 

As the water evaporates, the salt content increases and evaporation rate goes down. When it becomes supersaturated, it settles out on the packing and is a bitch to remove it. Take care of it, and it works, If not--great grief.

James Watts
- Navarre, Florida
^


 <

Two things that you need to watch out for are iron oxidation and precipitation (filter the solution from the evaporator before returning it to the plating tank), and a build-up of zinc in your plating tank.

Lyle Kirman
consultant - Cleveland Heights, Ohio
^


 

Among the previously listed caveats for evaporating chloride zinc solutions I would like to add that unless you heat the solution your evaporation rate will be quite slow and you will rapidly get the mentioned salt formation in the evaporator. If you have not already purchased the evaporator, you should explore these concerns with the various manufacturers.

If it is your intention to return the solution to the process tanks, the other writers are correct in stating that the metal content will increase. The anode efficiency in acid chloride zinc plating is greater than the cathode efficiency - this is why most zinc platers never need to add zinc chloride to the bath. Also, you are concentrating your impurities by concentrating the solution. If you heat the solution you can break down some of the organic additives. I would suggest transferring back to the process tank by way of a carbon filtration unit. Also, these same additives are known to cause high foaming in atmospheric evaporators (packing type). Defoamers are generally not compatible with the brightener chemistries when returning the concentrate to the plating tank.

Say Hi to Micheal for me.

Gene Packman
process supplier - Great Neck, New York
^

none
finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start 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:

 
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g, Train'g
& Software


About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA