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Exploring the: Anodizing Troubleshooting & Quality Control Zone
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- “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
- ASTM Test Comparison
- What is the difference between ASTM B136-84 and B-136-77 for the Modified Dye Stain Test?
Ask an Expert Published: 8/1/2010
- 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
- Dying Anodized Parts With Small Holes
- We send our 6061 aluminum bars to an outside anodizer for Type II anodize and black dye. These parts have several very small diameter, blind holes, both threaded and non-threaded. When we get these parts back from the anodizer, the tapped holes will...
Ask an Expert Published: 8/1/2010
- Teflon Impregnation and Wear
- Does Teflon-impregnated aluminum offer a higher resistance to wear or corrosion?
Ask an Expert Published: 2/1/2010
- 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
- Dichromate Sealing and Fatigue Life
- We are looking for some references that show that dichromate sealing restores the loss in fatigue life caused by hard anodizing aluminum alloys.
Ask an Expert Published: 2/1/2010