Phosphoric acid anodizing per BAC and ASTM D Q. I am looking for technical information on PAA (phosphoric acid anodizing). 29 Dec D – Designation: D – 98 AMERICAN SOCIETY FOR TESTING PA Reprinted from the Annual Book of ASTM Standards. 1 Jun ASTM D Standard Recommended Practice for Preparation of Metal. Surfaces for Adhesive Bonding. ASTM D Standard Guide for.

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If you want a quick and dirty demonstration, make standard peel aetm specimens from candidate surface preps. We appended your question to a thread which should answer many of your questions without having to asfm for replies. I would guess that the copper from the alloy could be somewhat to blame, along with whatever dissolved out of your cathodes. Now maybe there are some issues that are addressed inside of NASA that I am not aware of obviously, but I don’t see the reasoning behind phosphate coating over chromate.

Phosphoric d933 anodizing is done with stainless steel cathodes. Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Minford from Abe Books or info on Amazon. The values given in parentheses are for information only. One option was to eliminate the entire process and propose Ion Beam Assisted Deposition treatment to the components. James’ recommendation was fromand even then the “Light Metals Finishing Process Manual” was quite hard to find.

If you are curious about Nadcap, the meeting results should be available on their website at the end of the month. Broussard plating and metal finishing shop – Albuqerque, New Mexico A. My company has a small phosphoric acid anodize set-up for prepping Al and Aastm.

Chromic acid etch, sand blast, bi-fluoride etch, sanding. Sorry for d393 non-definitive answer. I am not an expert, but this would be my guess. Also, are there any alternative platings that can produce the same results? You MAY be surprised by the result. Need a source for PAA etch to D [link by ed. PAA and Chromic acid anodizing d3393 thin coatings which I wouldn’t expect to have nearly the bad effect on fatigue strength that much thicker coatings like sulfuric anodizing have, yet they are somewhat porous and adhere to the substrate well, while being corrosion resistant.


If you are interested, one I might suggest is Surface Prep. Does the spent solution turn yellow with continued use? It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Hello, I am working on a Epoxy joint on Aluminium. I don’t know if the patents have run out on BAC or not — you’d have to do a patent search.

Stiltner, the answers to your questions are partially in the two volume set by Wernick, Pinner and Sheasby, The Surface Treatment of Aluminum and its Alloysand a number of books on pretreatments of aluminum for bonding purposes. I am working at a US Air Force base. See D [link by ed. Ted is right that some adhesive bonding is performed using CAA as an alternative to PAA, but my understanding is the lap shear test comparisons do not show the same results over time.

ASTM D3933 – 98(2017)

To make more info available with less searching, we’ve combined together satm this page a number of previously separate threads about phosphoric acid anodizing. I need info like tank liners, cathode material, voltage and amp requirements, bath temp, etc.

My main question is what is the recommended cathode material for this chemistry? So I am now looking for the BAC to get more information. There is very little information on this specialized process. The methods may be revised or supplemented, as necessary, to include methods based on proven performance. Parts must be transferred to the clean room within two hours of removal from the PAA line and be primed within 72 hours.

The Mil spec was written to get people to use stressed, environmental testing for adhesive bonding quality control instead of relying only on plain lap shear tests and to use good overall practices. Phosphoric acid anodizing PAA is used to give aluminum a good tooth for adhesive bonding.


Please send contact information, I’ll forward drawings for an RFQ. It is then sealed using DI water in a series of two dip tanks. In addition, clad aluminum bonded parts corroded in the clad layer, thus releasing the bond. What is the temp of those tanks? When we wrote it some years ago, it contained just about everything we wanted for aerospace structural adhesive bonding.

What are the surface phenomenon characteristics of PAA d9333 make it so desirable for adhesion? The phosphoric acid anodized sheets are then pressure bonded. There are better, but cost a lot more. We would like to know if it is it normal for the solution to turn a yellow color after processing.

The main office, downtown, used to asgm one of the finest libraries going. Do you know where I can get the info? As the voice of the U. We have tinkered with PAA over the years typically applying adhesive primer after anodizing, but anodizing is a conversion coating.

Phosphoric Acid Anodizing (PAA Process, primarily for adhesive bonding of aluminum)

The wstm for the adhesion test should have the parameters you need for applying the anodic coating. You may find something on the web under PAA or BAC, or you can do a literature search which will give you some data, or consider contacting Boeing’s commercial development office about licensing BAC Our asstm system needs to be improved upon.

Others tell me that PAA requires primer application within 3 hours of anodizing and near clean room surroundings to avoid subsequent damage. My company is co-molding forged aluminum inserts into a carbon fibre component for the auto racing industry.

First of all, you probably want to use stainless steel cathodes instead of aluminum for PAA.