Posted by SUPERIOR ANODIZING CO. LTD. (74.14.109.74) on April 28, 2008 at 10:31:08:
In Reply to: Black particles flaking off small part posted by David Bohn on March 05, 2008 at 12:04:27:
: Hi-
: I have a production problem with black particles flaking off of a black anodized aluminum part.
: The part is stamped aluminum, 15 mil thickness, about 6mmx6mmx1mm in size.
: This part is used in an optical application, so the flaked off particles cause problems with the optics. The particles range in size from 5um to 20um.
: We have EDX the particles, and of course they are aluminum oxide.
: What is causing these particles? What process improvements should we be looking at?
: Thanks-
: David Bohn
: Principal Hardware Engineer
: Microsoft Corporation
: davebohn@microsoft.com
: 970-225-9676
It sounds like you have carbon deposits in the aluminum