-- The Home Page of the Finishing Industry
23+ years of serious education, promoting Aloha,
& the most fun you can have in metal finishing smiley
    no popups, no spam
on this site
current topics
topic 11421

Anodizing Aluminum Convex Shapes (cubes, pyramids, etc.)


Is there a recommended way to anodize die-cast aluminum (alloy 518.2) convex shapes such as cubes, pyramids, etc?

Rack marks must be minimized - should / could a rack be built that would contact the shapes along the corners or edges? Or is there a better way?

The first run will be for 1,250 of each shape. Each shape is 3.2 cm (about 1.25") in diameter.

Jeff Tupper
- Toronto, Canada


You can certainly have racks made for these parts, or you buy "adjustable" titanium racks. Rack marks can be minimized by grabbing the part on a spot along an edge. Depending on end use and customer spec, it is often acceptable to cover a tiny rack mark with a magic marker or other cosmetic approach.

If you contact a skilled bulk anodizer, it is perhaps possible that these parts could be bulk anodized to your satisfaction (which would be much less labor intensive).

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


We usually use titanium racks with pointed clips for most parts that we anodize. You are right- contacts are usually at the edges or corners to minimize marks. This is the best way we know.

Dado Macapagal
Scarboro Ont - Toronto, Ont

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.