-- 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 4799

Modified Dye Stain Test


I am seeking the process for the modified dye stain test used for testing seal integrity on anodized aluminum. I believe one should use 50% nitric acid, and Blue 2LW dye, but I'm not positive. I also need the times the solutions should be left on the test piece.

Thank you,

Marc Green
Marc Green
anodizer - Idaho



I am familiar with the modified dye stain. where I work we use 30% nitric for 5min then the blue dye for 5min. there should be no blue. we have to wait 24hrs before perfoming this test. without a hot seal it will not pass this test. the aluminum needs to hydrate the pores so cutting fluids and so forth will not penetrate the seal.

We also do a test called ADT. acid dissolution test using potassium dichromate PHOSPHORIC ACID at 100 degrees for 15mins. we weight the part before and after and use the weight loss and parameter of that pc.a loss of a loss of 10 grams usually is considered a failure. Well, hope this helps ya out. if you need anymore info I would like to help out.

Well, have a good one.

Brian Vandivier
- Franklin'In

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.