Larry Chesterfield
Change in Aqueous Cleaning Process
Question: Our use of a non-etch, alkaline soap cleaner has been an old and reliable standby for in-house cleaning of parts that we then send to an outside vendor for additional cleaning and chromating (chem film). Our vendor has decided to change from an alkaline cleaner to an acidic cleaner and this has raised some questions.
Read MoreChem Film Over A Black Anodized Coating
Question: We are working on some parts with the following customer specification: Black hardcoat anodize (Type III, class 2) to match #37038 (FED-STD-595), followed by a Class 3 chromate conversion coating over which we are to apply a primer and black paint to #37038.
Read MoreMasking Techniques
Question: We are looking for a better way of masking off areas on a number of machined parts.
Read MoreWhite Spots on Anodized Parts Dyed Black
Question: We are having a problem with very small “white” spots that appear on our parts that we anodize and then dye black.
Read MoreHardcoat Anodizing Controls
Question: We operate a hardcoat anodize tank and we are having trouble getting thicker coatings of 2.0 mils, or slightly greater, without running the loads for more than an hour.
Read MoreLaser Engraving Anodized Aluminum
Question: We have an issue with a 30-watt CO2 laser engraver that we are using to mark our aluminum parts.
Read MoreDichromate Sealing Problems
Question: We have carried out salt spray testing on 2024-T4 bare chromic acid anodized parts.
Read MoreWhat are the Properties of Black Anodized Finishes?
Quesiton: My company uses black anodized aluminum substrates in devices for biological cell maintenance systems.
Read MoreDark Gray Spots in Clear Anodizing
Question: I am having a problem with surface imperfections in the anodizing on a new product of ours which we machine from 7075. The imperfections look like small dark gray spots in the clear anodizing. Under a microscope they look like corroded areas which have actually eaten away the machine marks in spots. Any advice would be greatly appreciated.
Read MoreChecking Quality of Seal
Question: We manufacture parts that have a Type II anodic coating that is 0.4–0.6 mil in thickness.
Read MoreTeflon Impregnated Anodizing
Question: From what I have read, Teflon® impregnated anodizing does not really have Teflon impregnated in the coating, but it is actually only adhered on the aluminum oxide surface.
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