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Clear Anodize as a Paint Base
Our parts are generally Type III (hardcoat) anodized, sometimes duplex-sealed and sometimes unsealed. Our end-products are subject to sea water, and we try to adhere paint and polyurethane potting compounds to some of the parts. Would paint adhesion...
Ask an Expert Published: 10/23/2013
Hardcoat Anodize Thickness Problem
During the anodizing cycle, how can we check to see if the coating thickness is reaching the thickness requirement stated on the drawing?
Ask an Expert Published: 2/1/2012
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
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
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
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
Stripping Hard Anodic Coatings
Our company has an anodizing vendor that recently had some problems with our hardcoat anodized (Type III) parts. The problem was leakage around the masking, resulting in poor quality parts. The anodizer claims they can chemically strip the hardcoat...
Ask an Expert Published: 2/1/2009
PROBLEMS WITH BLACK DYED PARTS
Our company manufactures enclosures for the medical and telecommunications industries. Recently, we’ve had rejected parts because the black dye is coming off when the parts are wiped down with DI water.
Ask an Expert Published: 11/1/2008
Oxalic Acid Anodizing—the Basics
What are the general processing conditions for oxalic acid anodizing? Are they essentially the same as for sulfuric acid? Can titanium racks be used successfully in this process?
Ask an Expert Published: 2/1/2008
Hardcoat Coating thickness Consistency and Uniformity
My question is, is it possible for the parts to be anodized to more precision than 0.0004–0.0008 inches? What is the Martin process, and who does it?
Ask an Expert Published: 11/1/2007

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