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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I would suggest starting there with some of the engineering requirements then go to the PAA spec.

The surface morphology of PAA, and coating thicknesses produced are much better suited to bonding operations than SAA. Do you know where I can get the info?

You might find the article “An Alternative to Anodization: I am looking for any information on the removal and control of algae that is in our Phosphoric Acid Anodizing zstm. I don’t know if the patents have run out on BAC or not — you’d have to do a patent search. The use of a Ultra Violet system has been mentioned as one possible cure?

My customer requires this process as they need to go for another bonding process. To make more info available with less searching, we’ve combined together onto this page a number of previously separate threads about phosphoric acid anodizing.

You may be looking for Boeing’s BAC process.

Very straight forward and the cheapest good reference. The discoloration could be related to some of the alloying materials dissolved in solution. If you see an affordable copy anywhere these days, grab it: I have just quoted a large phosphoric anodize job. Currently, Nadcap does not have a specific PAA spec, but one will be handed down soon after their quarterly meeting this month.

Others tell me that PAA requires primer application within 3 hours of anodizing and near clean room surroundings to avoid subsequent damage. PAA and Chromic acid anodizing are 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.


This is auto racing, not aerospace, so we have some flexibility, but still cannot tolerate problems. Chromic acid and other anodizing methods, while good for corrosion protection, seldom proved in environmental stress tests, e. The main office, downtown, used to have one of the finest libraries going. A specific precaution is given in 5. Minford from Abe Books or info on Amazon.

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

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. Will it require a different sealer, such satm with sodium chromate? Parts must be transferred to the clean room within two hours of removal from the PAA line and be primed within 72 hours. My understanding is that some of Boeing’s competition f3933 not use this process for adhesive bonding, but rather a variant of chromic acid anodizing.

There is very little information on this specialized process. Can anyone tell me what equipment is needed to phosphoric anodize aluminum? Is there any literature about the advantages and problems associated with switching from phosphoric acid to sulfuric acid anodizing?

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 adtm.

That is a management decision. A specific precaution is given in 5. Also, PAA anodizers say you can laminate carbon skins directly to the converted surface without galvanic problems, but other coatings still require qstm glass barrier.

ASTM D3933 – 98(2017)

The methods may be revised or supplemented, as necessary, to include methods based on proven performance. What are the surface phenomenon characteristics of PAA that make it so desirable for adhesion? Our PAA plater is getting hardware no roughness specified where the surface has a mirror like finish, probably a RMS. I am trying to set up a d393 bench top operation.

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I was hoping someone could suggest a filtration technique for the acid tanks to keep chloride and fluoride levels down to acceptable levels 35 ppm for chloride, 75 ppm for fluoride. Can you help me with a process for Phosphoric acid anodizing. I wouldn’t be too worried about it until the concentration climbs above what is allowed.

Phosphoric acid anodizing per BAC5555 and ASTM D3933-98

I cannot talk about certain Boeing processes on an Internet website for obvious reasons but would be glad to speak with you in person if you wish.

Wegman published by Noyes publications. I am skeptical-any truth to this? 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 Ray Handwerker – Bensalem, Pennsylvania. We appended your question to a thread which should answer many of your questions without having asm wait for replies.

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. Subscription pricing is determined by: I am trying out Phosphoric Acid anodizing for a new customer.

Basically there are some particular surface phenomenon characteristics with PAA which are not acquired elsewhere other than possibly FPL etches, and that could be arguable. Hi, Krag and Jeff.