Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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How to chromic anodise black
A CUSTOMER HAS ASKED FOR THIS FINISH.
PHIL YEOMANSPlating shop employee - UK
January 14, 2008
Interesting question, Phil, thanks. I've never heard of doing this, so I await some feedback from one of our experienced readers.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
January 14, 2008
First of two simultaneous responses --
Chromic Acid Anodzing can be dyed black, not very pretty, but black enough to color code.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
January 15, 2008
Second of two simultaneous responses --
I have seen this sort of request on several occasions recently. It's almost as if designers have decided that Chromic anodise will absorb dye like sulfuric anodise.
What they are essentially after is Chromic acid anodise with a supplementary black dye. It can be done but the results are highly variable and you will never get a consistent black colour, you will get plenty of shades of grey/red/blue, depending on what the dye base colour is.
Aerospace - Yeovil, Somerset, UK
January 16, 2008
Chromic Acid Anodiizing can be dyed black, not jewelry pretty, but black enough for color coding.
Robert H Probert
Robert H Probert Technical Services
Garner, North Carolina
January 16, 2008
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