Anodizing

Exploring the: Anodizing Zone

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Published: 2/1/2009

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?

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...

Published: 11/1/2008

Problems with Black-Dyed Parts
Recently, we’ve had rejected parts because the black dye is coming off when the parts are wiped down with DI water.

Published: 11/1/2008

Glue Adherence to Black Anodize
Question We’re having a problem with glue not adhering to anodized parts made from extruded 6063-T6 aluminum and finished with heavy etch and black anodize per MIL-A-8625, Type II, Class 1. The problem parts come in batches, something lik...

Published: 11/1/2008

Hardness of Hardcoat Anodize
Question: What would be the hardness of the Alcoa Alumilite 226 hardcoat finish? The substrate is 6061 alloy aluminum tubing. G.S.

Published: 11/1/2008

More on Type I vs. Type II Anodizing
In a question I addressed back in May, C.S. asked about rinsing Type I (chromic acid anodizing) coatings vs.

Published: 11/1/2008

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.

Published: 8/1/2008

CALCULATING ANODIZING RATE FOR TYPE II AND TYPE III COATINGS
Question: We’re new at anodizing and we would like you to explain how to calculate the time it takes to get a given coating thickness when you have more or less “standard” anodizing conditions.

Published: 8/1/2008

BLACK SUBSTANCE ON RAG
We are yellow chromating aluminum alloy 360 die castings. After processing, a grey/black material appears on rags used to wipe the parts. What is this material, and can it be prevented?

Published: 8/1/2008

TYPE I VERSUS TYPE II ANODIZING
Question: I operate a small sulfuric acid anodizing line and have a question about chromic acid (Type I) anodizing.