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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Can't get proper black color on hardcoat anodizing
July 27, 2021
Q. I have a customer part which is requesting for Type 3 Class 2 Anodizing, we are able to meet the thickness of the coat which is 40-60 microns, however after black dyeing I can't seem to match the color of a sample piece given to me by the customer.
Details of my process are below.
Part Material : Alu 5083
Dye: Sanodal Deep Black MlW
Dye Concentration: 10g/l
Temp : 55-60
Immersion time 10-20mins
Please advise.
- Singapore
A. Tommy
The pores of Type III anodize are much smaller than those produced with Type II anodize. At a minimum, better rinsing is required.
Consider reviewing the FAQ's on this website (Introduction to Anodizing of Aluminum) for guidance on post anodize treatments, or review post 56305 for some tips.
- Green Mountain Falls, Colorado
August 3, 2021
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