Home /
Search 🔍
the Site
pub Where the world gathers for
plating, anodizing, & finishing Q&As since 1989


Non insulated anodes in cyanide zinc tank

December 4, 2008

Hello, recently I'm running a cyanide zinc plating line in Venezuela, we plate planar steel pieces of 4"x 4" x 0.7 mm average dimensions in a rack of 30 pz each, our baths dimensions are: 1 x 2 x 1 meters, the question is: The anode lead of the rectifier is attached to the steel tank, and the zinc anodes are hanging in a bar welded to the tank... yes they are not insulated! And I don't now why because all the theory say the opposite thing. Please give me some advice about it.

Eduardo González
Plater - Charallave, Venezuela

December 4, 2008

Hi, Eduardo. This was a very common arrangement when I started in this business many years ago, and there is no reason to consider it unworkable, but it is not very common anymore.

Perhaps the biggest downside is that you will generate some quantity of iron cyanide with this arrangement, and removing iron cyanide from your wastewater is not a simple matter because iron cyanide is not amenable to chlorination. If you are suffering from excessive non-amenable cyanide in your wastewater, you may have to go to a plastic lined tank and insulated anodes to resolve it; but if you are not having wastewater problems, there is no reason you can't get satisfactory plating from this arrangement. But when it's time to replace it . . .


Ted Mooney, finishing.com
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey

December 20, 2008

With your system you are using your bath as a part of the anode and you could one day find all your bath on the floor, because you eat specially the weldings off the bath.
Is better to use a plastic bath or you can put specially plastic bags inside the bath

Ricardo Burstein
Bnei Berak, Israel

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

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:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2023 finishing.com, Pine Beach, New Jersey, USA