-- The Home Page of the Finishing Industry
Serious Education & the most FUN
you can have in metal finishing smiley

No popups, spam, registration or passwords
on this site
current topics
topic 9342

Green Anodize has "Dull Finish"


We are a Job Shop in Central Virginia. Some of the parts we manufacture from 6061 aluminum require Green Anodize which we sub-contract. We are having trouble determining what surface treatment/preparation we need to do in our shop to insure these parts come back looking "Bright" with a "consistent" color. Most of the parts have some welding and we use a compatible filler rod. The weld itself looks good but is the heat causing problems elsewhere? Some parts have spots, some are dull (probably from Scotch-brighting), some are light, some are dark. These are tubular parts made from pipe or tubing 4" to 8" I.D. X 6" to 28" long.

Bill Leech
precision tooling - Lynchburg, Virginia



Bright is a function of smoothness or RMS surface profile. The smoother the surface, the brighter the parts and the lower the RMS. Normal range for "bright" could be anywhere from 8 to 18 RMS. Your spotting problems seem to be coming from somewhere else. Either it is a pre-treatment cleaning or chemical problem.

tony kenton
AF Kenton
Hatboro, Pennsylvania

If you have a question in mind which seems off topic, please 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.