-- 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 10768

Determining what finishing process was used on an aluminum part


Dear Sir or Madam,

I have a deep drawn aluminum urn that has a bright shiny outside surface. I would like to know if there is any way to find out how this surface finish was achieved. e.g. if it was anodized is there some way to verify that?

VOM meter

Leo Driessen
- Melbourne, Australia


Hello Leo!

An anodized aluminum surface is non-conductive. Perhaps you can check it with a voltmeter.

Good luck!

lee gearhart
Lee Gearhart

probert book
Aluminum How-To

by Robert Probert
$89 New
The Chromating - Anodizing - Hardcoating Handbook

Surface Treatment & Finishing of Aluminium and Its Alloys
Wernick, Pinner & Sheasby
from Abe Books



If it is not oxidizing into white spots it's either because it is anodized or because it has a clear lacquer on it. The lacquer would be relatively soft while anodizing is very hard. I guess I might try to scratch a non visible area and immediately test it with an ohmmeter. If it doesn't conduct after the attempted scratching, it's probably anodized. If it does, it was probably lacquer coated. A lab could give you a definitive answer instead of a "probably".

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

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.