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Is Titanium Anodizing in Neutral Electrolyte same as AMS 2488 Type II?

We've been doing AMS 2488, Type II, titanium anodize in a highly caustic bath but recently became aware of a nearly neutral electrolyte at pH 6.9. What are the expected differences between titanium anodize done in non-caustic electrolytes? Is there a difference or not?

Milt Stevenson
Plating & Anodizing Junkie - Syracuse, New York, USA
April 26, 2011

Milt: The main difference in the two baths are rectifier type and thickness of the coating you can attain. AMS 2488 coating thickness is much like type 1 anodize of alum, whereas the neutral bath with proper rectifier will give you soft anodize coating thicknesses of .0002-.0004 in.

Kent Backus
Fort Worth, Texas, USA
July 27, 2011

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