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Alodine 1200S vs. 1201; Alodine vs. Alochrom

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

Alodine is a Henkel trade name mostly used for their line of chromate conversion coating chemistry for aluminum.
The most common spec for this process is MIL-DTL-5541 [affil link or DLA].
It is sometimes called 'chem film', especially in the USA.
Iridite is an Enthone/Macdermid trade name for their chemistry for this process.

Q. Customer called out Alodine 1201 [on eBay or Amazon affil link] as a replacement for Alodine 1200S. What is the difference between these products?

Best Regards, Menno Velthuijs.

Menno Velthuijs
- Nieuw Vennep, Holland, Europe

A. Alodine 1201 [on eBay or Amazon affil link] is a ready-to-use chromate conversion chemical; that is, for its original purpose there are no make-up or control parameters to be concerned about. In terms of U.S. military specifications, which many aircraft companies use as a guide, it is qualified under the Qualified Products List MIL-DTL-81706 [affil link or DLA] as a brush-on only. It was created primarily for touch-up and repair of scratched surfaces which had been previously anodized or chromated. If not tied into a specification such as the above, it can be diluted 1 part: 2 parts water to make an immersion bath for chromating new parts. As a bath it can be controlled like Alodine 1200S.

Alodine 1200S is a powder, chromate conversion chemical which must be dissolved in water to make a bath, which is then used to chromate aluminum. Under the QPL it is qualified for immersion, spray, or brush-on coatings. In terms of processing aircraft parts, AL 1200S has been the benchmark of the industry for over 40 years. Alodine 1201 [on eBay or Amazon affil link] is similar to a 20 gram per liter solution of Alodine 1200S. The AL 1200S can be used anywhere AL 1201 is used, but for large amounts of touch-up work or if handling of a liquid is preferred, AL 1201 is more convenient.

We are not aware of immersion baths of Alodine 1201 being used on a long-term basis, and if the reason for using it is strictly to handle liquids, we have another liquid product on the above QPL, Alodine 1600, which was designed for long- term use in immersion or spray baths.

phil johnson
Phil Johnson
- Madison Heights, Michigan

Multiple threads were merged: please forgive repetition, chronology errors, or disrespect towards other postings [they weren't on the same page] :-)

Q. My question is about Alodine 1200S and Alodine 1201 [on eBay or Amazon affil link]. Is Alodine 1200S considered an oxidizer? And is Alodine 1201 a corrosive? or vise-versa. A fellow co-worker had asked me this. I would like to know myself whether this is correct.


Al Rueda
American Eagle Airlines - DFW Airport, Texas, U.S.A.

A. Alodine is a brand name (Henkel), not a generic type of process. Contact the chemical manufacturer with these specific questions.

tim neveau
Tim Neveau
Rochester Hills, Michigan

Q. Is Alodine 1200s the same as Alochrome 1200. I believe that the European trade name is Alochrome but the 2 products are one of the same thing. Am I right in thinking this?

Lee Franckeiss
- England

A. Yes you are perfectly correct.

Ciaron Murphy
- Great Britain

A. The following statement is taken from a document produced jointly by Trimite (our supplier for Alocrom 1200) and Henkel Technologies UK.

"Alodine 1200 is chemically identical to Alocrom 1200"

Richard Mosley
metalsmiths - UK

Q. I am UK based and have an enquiry from an American customer for a part with an Alodine 1000 (clear) finish, my metal finisher has offered Alochrome 1000 as an alternative and I need to know if this is a suitable alternative, The part is going in a vacuum environment and must not out-gas or give off any vapours which might affect the process.
Thanks Graham.

Graham Coleman-Hill
product designer - Shebbear, Devon, UK

A. Hi, Graham. I appreciate Mr. Mosley taking the time to quote the Henkel documents, but manufacturers can reformulate trade name products at any time, so I'd inquire of Henkel directly at the time of use. Good luck.


Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

[editor appended this entry to this thread which already addresses it in lieu of spawning a duplicative thread]
Q. Hi.
Can anybody tell me the difference between Alodine 1200 and Alochrom


Mike Baker
Sales - Southwold, Suffolk, UK
June 2, 2011

Q. Will this Alodine 1200 or Alodine 1201 [on eBay or Amazon affil link] color pot metal, such as a carburetor?

Burke Young
- Farmersville, Texas
May 13, 2010

A. Hi, Burke. Chromate conversion chemicals do color both zinc and aluminum, although corrosion resistance rather than tinting is their main purpose. The particular proprietaries that were mentioned are designed for treating aluminum surfaces, not zinc diecastings, but they probably will turn zinc somewhat yellow, even if not actually designed for the purpose. It's a bit like asking if you can use yellow house paint on your car because you prefer yellow to its present color, though; you'd be better off picking a chromate conversion chemistry that is designed for zinc diecastings.

But please note that these solutions are based on chromic acid (toxic and carcinogenic "hexavalent chromium"). To use toxic materials for purposes for which they are not intended probably isn't a good idea.


Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

Q. Does this agent change the colour or finish of aluminium too? I would like to use it as a pre-coat on alloy rims before putting a clear finish on them.

Hilton George
- Louisville, Kentucky, USA
April 19, 2011

A. Hello, Hilton. Yes, but again, its purpose is corrosion resistance/pretreatment rather than coloration and you may not be happy with its somewhat uneven, somewhat yellowish appearance.


Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

Q. Thanks for the response, I apologize for asking a question that was already answered above if only I'd read carefully through your description.

My main concern is paint adhesion. I've decided to go ahead and just paint them vs just a clear finish and I've heard that it's hard to get paint to adhere to Aluminum surfaces. Any suggestions would be helpful.

Hilton Bastick
- Louisville, Kentucky, USA

A. Hi again.

If you plan to use paint rather than having the aluminum look show through a clear coat, then the Alodine 1201 [on eBay or Amazon affil link] conversion coating idea is a very good pretreatment to help with adhesion to aluminum surfaces as well as corrosion resistance. Good luck.


Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

[editor appended this entry to this thread which already addresses it in lieu of spawning a duplicative thread]
Q. Hi,
Can anyone tell me which company produces Alodine 1201. Need to contact their agent here in Malaysia.
Best regards,

Johan sahib
- shah alam, selangor, malaysia
April 28, 2012

A. Hi Johan.
The manufacturer of Alodine is Henkel. You can find them on the web. Good luck!

Ted Mooney,
Ted Mooney, P.E.
Striving to live Aloha - Pine Beach, New Jersey

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