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topic 2666

Black anodize on 380 die castings


We are anodizing Type II Class 2 some gun parts that are 380 die castings. We know all of the problems associated with getting a good black color on a 380 die cast.

We are doing all we can, we give the pieces a rollbrite finish prior to anodize & we are using the Clariant black CRO dye which is supposed to work best on die castings.

Any one have any advice?

Should it be run at high voltage? Currently we are running at 15V.

Are we using the best Black dye for die castings?

We know we can use special pickles like nitric- hydrofluoric acid mix but we don't want to get involved with that on a production job.

Should it be run at a higher temp - currently running at 70 deg F for about 45 min or 75 deg F for 40 min.

Any advice greatly appreciated.

David A. Kraft
- Long Island City, New York

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