Letter 4799

Modified Dye Stain Test 

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I am seeking the process for the modified dye stain test used for testing seal integrity on anodized aluminum. I believe one should use 50% nitric acid, and Blue 2LW dye, but I'm not positive. I also need the times the solutions should be left on the test piece.

Thank you,

Marc Green anodizer - Boise, Idaho

Hello.

I am familar with the modified dye stain. where i work we use 30% nitric for 5min then the blue dye for 5min. there should be no blue. we have to wait 24hrs before prefoming this test. without a hot seal it will not pass this test. the aluminum needs to hydrate the pores so cutting fluids and soforth will not penetrate the seal.

we also do a test called ADT. acid dissolution test using potassium dichromate PHOSPHORIC ACID at 100 degrees for 15mins. we weight the part before and after and use the weight loss and parameter of that pc.a loss of a loss of 10grms usually is concidered a failure. well hope this helps ya out. if you need anymore info i would like to help out.

have a good one brian

Brian Vandivier
- Franklin'In

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