Pretreatment for Anodizing

Exploring the: Pretreatment for Anodizing Zone

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Published: 1/1/2017

Water Quality in the Anodizing Process
Q. I would like to know more about the physical and chemical parameters that are used to evaluate the quality of water used in the anodizing process.

Published: 1/1/2017

Anodizing Clinic: Sealing with Distilled Water
Q. Can distilled water be substituted for deionized water? Our facility can create a distilled water heated bath fairly easily because we already produce distilled water for another process. A DI water bath would be much more expensive. 

Published: 12/28/2016

Anodizing Clinic: Painting Parts After Anodizing; Seal, or No Seal?
Q. In conversations with our anodizer on the best way to seal parts for adhesion prior to painting, he referred to a choice of either a final hot water immersion at around 120°F with no seal or a hot water seal at a much higher temperature. What is ...

Published: 11/3/2016

Anodizing: Corrosion on Hardcoat Anodized 7000 Series Forging
Q. I sent you photos of two parts that are alloy 7050 forgings. On these parts there are spots that appeared as a result of Type III (hardcoat) anodizing that were not present before anodizing. They look like corrosion of some sort, but the corrosio...

Published: 2/1/2016

Anodizing Q&A: Rinsing Blind Holes Prior to Dying
I have problems with leaching from blind holes in black anodized parts.

Published: 10/23/2013

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...

Published: 5/3/2013

“Water-Break-Free” Test
What is a “water-break failure” test?

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?

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...

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?