-- The Home Page of the Finishing Industry
A website for Serious Education, promoting Aloha,
& the most FUN smiley you can have in metal finishing.
    no popups, no spam
on this site
current topics
topic 0363

Hard Anodising of high silicon content aluminum alloys

A discussion started in 1996.
Add your Q. or A. to restore it to the "Current Topics" discussions.


I need to put a thick oxide layer ( more than 30 microns ) when hard anodising high silicon content ( over 10%) aluminum alloys .
These alloys are used by the foundries . Typically in the US it would be a 390 alloy .

Has anybody an idea of how to do that ?

All the tests we have done so far have resulted in an oxide layer thickness under 10 microns .

Thanks for your input .

- France

The devil is in the details, Eric, but in general the way you get thick hard coatings, is to keep the temperature way down (25-32 degrees F. / -4 to 0 degrees F.), and apply high voltages (50 or more volts is not uncommon). But that is a great deal of silicon and certainly sounds like a problem :-(

Ted Mooney, Teds signature
Ted Mooney, P.E.
Pine Beach, New Jersey


You need a specialty chemistry hardcoat system for high copper alloys

David A. Kraft
- Long Island City, New York

This public forum has 60,000 threads. If you have a question in mind which seems off topic to this thread, you might prefer to Search the Site

ADD a Comment to THIS thread START a NEW threadView CURRENT TOPICS

Disclaimer: It's not possible to diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations may be deliberately harmful.

  If you need a product/service, please check these Directories:

JobshopsCapital Equip. & Install'nChemicals & Consumables Consult'g, Train'g, SoftwareEnvironmental ComplianceTesting Svcs. & Devices

©1995-2018, Inc., Pine Beach, NJ   -   About   -  Privacy Policy
How Google uses data when you visit this site.