Breathe easy! No maddening pop-up, sticky, or floating ads on this site :-)

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


Black hard chrome problems


We are a hard chrome plating shop that are trying to get a black chrome line set up.
The deposits seem to come out soft and polish off easily but leave the hard chrome surface underneath tinted a different color. The Bath we are using is made up of 32 oz per gallon of chromic acid, 28oz per gallon of Glacial acetic acid [adv: item on eBay & Amazon] 99%, and 1 oz per gallon Barium acetate. Air agitation is being used and various bath temps have been used between 75 and 100 degrees fahrenheit. Plating was done at 6 to 9 volts for up to 1/2 hour.
Anyone with any ideas or help would be greatly appreciated.

Allan Rothspan

June 13, 2008

I am having hard chrome plating unit with grinding shop.
I want to establish black hard chrome plating plant.
how can I proceed? Will you assist me?reply.

Parag Shah

June 16, 2008

Black chrome is a decorative process that is very thin. Thick coatings are not possible because you are using a "poisoned" bath to plate from. It is more durable than black nickel, but it will not stand up to the abuse that regular hard chrome does.

James Watts
Navarre, Florida

(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

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, Pine Beach, New Jersey, USA