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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...
Ask an Expert Published: 11/3/2016
Parts Cleaning Clinic: Cleaning of Inconel
Q. What cleaning methods are recommended for finishing Inconel 718? Can this material be passivated or utilize the Summa process as 300 and 400 series stainless steel, or is there another way to remove the contaminants in regards to machining parts ...
Ask an Expert Published: 11/1/2016
Parts Cleaning Clinic: Phosphate Coating Problems
Q. We electrocoat sheet metal, iron castings (machined and non-machined) and aluminum castings (machined and non-machined surfaces) and are having problems with poor phosphating on aluminum substrates. We maintain the free acid at 0.7-1.1 points and...
Ask an Expert Published: 11/1/2016
Parts Cleaning Clinic: Pretreatment Equipment Suppliers
Q. I am researching manufacturers of aqueous part washers and phosphate pretreatment systems for powder coating, looking for companies that build conveyor systems, washers and treatment systems; not parts washers. The parts to be cleaned are various...
Ask an Expert Published: 11/1/2016
Anodizing Q&A: Rinsing Blind Holes Prior to Dying
I have problems with leaching from blind holes in black anodized parts.
Ask an Expert Published: 2/1/2016
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
“Water-Break-Free” Test
What is a “water-break failure” test?
Ask an Expert Published: 5/3/2013
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
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

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