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"Wormwood" pitting problem in hardcoat anodizing
September 10, 2015
We are having trouble with pitting on the face of some extruded 6061-T6 parts. The pitting shows up only after the hard coat anodizing and is on about 10% of parts from one batch of material and a few parts made from totally different material. Pitting is sometimes on both sides and is clustered. The worst of it appears in sort of a "wormwood" pattern.
Is this galvanic corrosion or something else? I've read through others' posts and they are helpful. Can anyone suggest the most likely culprit here?
Chris Duppenthaler- Bellingham, Washington, USA
Chris, what were the pre-treatment and post-treatment processes on the items? How many items are in a typical batch that goes through your process?
Blake Kneedler
Feather Hollow Eng. - Stockton, California
October 28, 2015
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