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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
The Problem of Sealing Smut
Is there an anodizing cleanliness standard that is reasonable for our suppliers to meet? Is there an ISO, ASTM, IPC, Nadac or any other standard?
Ask an Expert Published: 2/1/2010
More on Anodizing Die-Cast Aluminum Alloys
The anodized parts are a dark gray color. In addition, we perform a salt spray test and the parts show corrosion pitting over more than 10% of the test panel after only 72 hr. Do you know if this is normal?
Ask an Expert Published: 2/1/2009

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