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Is it Anodized or Not?
What would be the best way to indicate whether or not an aluminum part has been electro-polished and anodized?
Ask an Expert Published: 2/1/2012
Chromic Acid Anodize Failing Salt Spray Testing
We are performing salt spray testing on 2024 and 7075 alloy test panels that have been Type I (Chromic Acid) anodized. The test panels have been sealed in DI water at 96°C (205°F) for 25 min. The panels fail the salt spray test within 24 hr.
Ask an Expert Published: 5/1/2011
When Black Dye is Not Black
We are sending aluminum extrusions to our outside anodizer for Type II anodize and black dye, and we are encountering several problems, notably that the newly black anodized parts exhibit a greenish tint.
Ask an Expert Published: 5/1/2011
Salts Build-up Around The Top of The Cathodes
The aluminum cathode bars in our Type II anodizing tank have become completely encrusted with white “salts” at the solution/air interface.
Ask an Expert Published: 2/18/2011
“Cracking” of the Anodic Coating Under High Temperatures
After anodizing, the parts are annealed at 100°C. Most of the time they will withstand this process without damage, but sometimes the anodic coating cracks. I would like to ensure that they never crack at 100°C.
Ask an Expert Published: 2/18/2011
Anodized and Dyed Black Extrusions Turning Green and Purple
We notice that the black extrusions have a greenish cast to them when we receive them from the anodizer. When the parts are exposed to plant lighting and to indirect sunlight, they turn a purplish color after six months or less.
Ask an Expert Published: 2/18/2011
Producing a Thick Anodic Coating on 6061-T6
Our customer has requested .004-inch (100µ, 4 mil) coating thickness on 6061-T6. We normally anodize this part to .002-inch thickness. Our process is 28 V, bath temperature 32°F, for 1 hr. We are not sure of exactly what the best procedure is to har...
Ask an Expert Published: 1/11/2011
"Snowflake" Corrosion on Anodized Aluminum Parts
One of our customers sends their extrusions to an outside anodizer near their plant. They sent us some samples of their anodized parts that were exhibiting a condition that looked like small snowflakes all over the part.
Ask an Expert Published: 1/11/2011
Black Power on Die Casting After Anodizing
After anodizing there is a loose, black powder that can be removed just by touch. Can you tell me why this happens and recommend a method to prevent it?
Ask an Expert Published: 8/1/2010
What is the Correct Anodizing Specification?
My company fabricates aluminum and steel pedestrian bridge railing among other bridge parts. We recently got an aluminum railing job that called for “Type I” anodizing per MIL-A-8625. There was no anodic coating thickness called out. We are not anod...
Ask an Expert Published: 5/1/2010

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