Clear Anodize 1

[RayBlaze]

Does anyone know the loss tangent and dielectric constant of Clear Anodize?

Thanks!

 

[kenvlach]

Don't know about loss tangent, but I'm pretty sure I have seen data for dielectric constant & breakdown voltage/thickness in The Surface Treatment and Finishing of Aluminum and Its Alloys, 6th Edition

http://www.asminternational.org/Tem...=Ecommerce/ProductDisplay.cfm&ProductID=11958

First, the anodic oxide properties depend upon the anodizing electrolyte & voltage & the Al alloy. A very thin barrier coating is used for electrolytic capacitors. The most common electrolyte in the US is sulfuric acid solution, which can be used at low temperature & higher voltages to give clear hard anodize (Type III) or at 68-70^oF and constant voltage to give clear Type II anodize (per MIL-C-8625F). The Al alloy also affects the oxides electrical properties, as does the sealing process.

Please give more info (Al alloy, process spec. & Type, anodize thickness, whether sealed, etc.). What is the application?

Ken