finishing.com -- The Home Page of the Finishing Industry

HomeFAQsSuggested
Books
Help
Wanteds
Advertise
on this site
FORUM
current topics
Live! From beautiful Pine Beach New Jersey: Welcome to the world's most popular metal finishing website

topic 18523

Trivalent chrome


2002

Is there any method for removing trivalent chrome from a regular chrome bath?

Michelle Amann
- Erie, Pennsylvania, USA


First of three simultaneous responses -- 2002

Michelle,

In a normal conventional chrome bath,trivalent chrome may be reduced naturally by electrolysis. Its volume is determined by the ratio between Anode area to Cathode area.Basically, Anode area equal to Cathode area (Cr+3 is consistent) Anode area greater than Cathode area (Cr+3 decreases ) Anode area less than Cathode area (Cr+3 increases ) Roughly,when ratio of cathode area and anode area is 2:1,and 3volt electrolysis is performed for 5 to 10 hours,0.5 to 1.0 g/l of Cr+3 will be produced.Vice versa,when the ratio of cathode area and anode area is 1:2.

Good Luck.

Cheah Sin Kooi
- Hong Kong


Second of three simultaneous responses -- 2002

A porous pot will do that very nicely as well as remove much of the tramp metal ions from the solution. Hard Chrome Consultants in Cleveland OH probably has the least expensive effective one.

James Watts
- Navarre, Florida


Third of three simultaneous responses -- 2002

Michelle:

Are you seriously doing chrome plating? Where did you leave your books or manuals or course notes? This question is among the first things one learns about chrome plating in any book or course. Anyway, the traditional means is to electrolyze the solution with an abnormally high anode to cathode ratio. Instead of 1:1 use 20 or 30:1 (large lead, small piece of steel). This will oxidize the ions back to hexavalent state. And before going further, go to an experienced person for more important advise like environmental concerns, waste treatment, personal exposure, etc.

Guillermo Marrufo
Monterrey, NL, Mexico



If you have a question in mind which seems off topic, please Search the Site

ADD a Q, A, or Comment on THIS topic START an UNRELATED topicView CURRENT 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


©1995-2019 finishing.com, Inc., Pine Beach, NJ   -   About finishing.com   -  Privacy Policy
How Google uses data when you visit this site.