netneut
finishing.com -- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing


Finishing.com has been free for 22 years,
but without net neutrality we could soon
cease to exist. Do us a solid, click on
the banner, and contact congress today!
HomeFAQsBooksHelpWantedAdvertiseForum
topic 7821

Removal of Trivalent Chrome


(2001)

Is there possibly a way to remove the trivalent chrome while at the same time plating with the hex chrome? I've heard if you could alter the sizes of the anode and cathode, and use a specific amp. or voltage, one can accomplish this. As of now with 750 gal we use 8,000 amps.

Any help on this inquiry would be greatly appreciated!

Kind regards!

Melissa Schemenauer
- Chippewa Falls, Wisconsin, USA


(2001)

Hi Melissa.

You can remove trivalent chrome by porous pot or a dialysator, when you did plating. Anode-Cathode is 2:1 in a chrome solution.

Regards

anders sundman
Anders Sundman
3rd Generation in Plating
Consultant - Arvika, Sweden



(2001)

To convert the trivalent Cr back to hexavalent Cr you need a small cathode area and large anode area. But as you plate the cathode will form dendrites therefore increasing in area. You will need to scrape off the chrome on the cathode to try to maintain as small of area as possible.

George Shahin
George Shahin
Atotech - Rock Hill, South Carolina


(2001)

From my experience I would recommend a porous pot on a separate rectifier, in a unused part of the tank or when the tank is not in use. Pourous pot because at the same time you would be removing other contaminates (cooper, iron). It is not very easy to adjust cathode to anode ratios and still plate the same quality in a lot of cases.

Chris Snyder
plater - Charlotte, North Carolina


(2002)

Pourous pots are not the answer in my opinion. You might as well dump a portion of the bath and recharge, if this is the method you choose. Eco-Tec a company out of Canada makes a very good system for removing trivalent, but also other metal contaminants.I have been using this system for about ten years on three different plating baths.We have a total of about 40,000 gallons of chrome. My trivalent never exceeds.02.Even though we plate a large variety of different sizes changing our anode to cathode ratio. My total metals never exceed a half ounce to the gallon.

Shane Lobdell
- Lexington, Nebraska, USA



This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Q or A to THIS thread START a NEW THREADView This Week's HOT TOPICS

Disclaimer: It's not possible to 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 may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices


©1995-2017 finishing.com     -    Privacy Policy
How Google uses data when you visit this site.