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Surface Pitting of Titanium - AMS 2488 Anodize

From time to time we have experience surface pitting in titanium parts being anodized per AMS 2488 using reverse current in a solution of caustic soda ⇦liquid caustic soda in bulk on Amazon [affil link] . Tank parameters are always within limits and the pitting is generally random, that is, both high and low current densities, machined and un-machined areas. Any ideas?

Dean Klix
- Ft. Worth, Texas
2006

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