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.
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.
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
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