Authoritative Answers, Fun, & Aloha -- no cost, no passwords, no popups
(as an eBay Partner & Amazon Affiliate we earn from qualifying purchases)

Home /
T.O.C.
Fun
FAQs
Good
Books
Ref.
Libr.
Adver-
tise
Help
Wanted
Current
Q&A's
Site 🔍
Search
pub     mobile?
Metal finishing Q&As since 1989

-----

Is Blue Alodine Bad?



TUTORIAL:
(to provide context, hopefully helping readers more quickly understand the Q&A's)

"Alodine" is a Henkel trade name for their chromate conversion coatings for aluminum.
"Iridite" is Macdermid's trade name for theirs.
The slang "chem-film" is often used in the USA.

MIL-DTL-5541 [on DLA] is the most common specification for the process.
probertEthumb Aluminum How-To
"Chromating - Anodizing - Hardcoating"

by Robert Probert

Also available in Spanish

You'll love this book. Finishing.com has sold 891 copies without a single return request :-)


I have been acid etching and treating Stearman Biplane parts with Alodine 1201 [on eBay or Amazon (affil link) ] . Castings and panels have been coming out of the solution a bright to dark blue color. Is the solution bad or is the color due to copper content of the aluminum? (which is world war II vintage and unknown.) Is a blue conversion coating safe to prime?

Luis F. Villar MD
- Stuart, Florida
2002


A. Taken fron Henkel Bulletin ...

"Variations in color result from different alloys, metal hardness,
metal age, method of cleaning, etc."

Alexander Saborio
Painter - San Jose Costa Rica
November 17, 2021




(No "dead threads" here! If this page isn't currently on the Hotline your Q, A, or Comment will restore it)

Q, A, or Comment on THIS thread -or- Start a NEW Thread

Disclaimer: It's not possible to fully 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 might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Finishing
Jobshops
Capital
Equipment
Chemicals &
Consumables
Consult'g,
& Software


About/Contact  -  Privacy Policy  -  ©1995-2024 finishing.com, Pine Beach, New Jersey, USA  -  about "affil links"