phosphoric acid anodizing

[midsidenode]

I'm not at all familiar with phosphoric acid anodizing, but apparently, I'm going to need it as a final process for surface preparations involving adhesive bonding. The problem is that I neither need it nor want it in other areas that do not involve bonding - it obviously involves dipping the entire part. I would prefer to have MIL-DTL-5541 Alodine on the surfaces that do not involve any bonding. The stupid question is: can I apply the spot Alodine after the anodizing or do I need to have the anodizing removed to apply the spot alodine?

 

[3DDave]

Anodize produces an aluminum oxide layer. Alodine/chromate conversion coating doesn't work on aluminum oxide.

I suppose masking can be used to block where the anodization occurs.

 

[midsidenode]

Thanks Dave
another question for you:
would you say that a phosphoric acid anodized coating is "conductive"?

 

[3DDave]

Aluminum oxide is not electrically conductive. It is thermally conductive.