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. Standard Guides for Automotive and Aerospace Adhesives from ASTM. Standard guides Back to ASTM Adhesive Standards Home ASTM D().

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Do you know where I can get the info? I don’t know if the patents have run out on BAC or not — you’d have to do a patent search. The method may be revised or supplemented, as necessary, to include methods based on proven performance. My basic question is: Chromic acid etch, sand blast, bi-fluoride etch, sanding. I am trying to set up a small bench astm-d3393 operation. I need info like tank liners, cathode material, voltage and amp astm-3d933, bath temp, etc.

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

They state that at this low roughness the plating has problems adhering. If you have further questions, please feel free to follow up.

People in our composites group are pushing the electroplating facility to install a phosphoric anodizing process to prep aluminum for adhesive bonding. We have tinkered with PAA over the years typically applying adhesive primer after anodizing, but anodizing is a conversion coating.

Our current system needs to be improved upon. Sorry for the non-definitive answer. The preparation of the metallic substrates to obtain surfaces with appropriate characteristics is a critical step.

We would like to know if it is it normal for the solution to turn a yellow color after processing. Chromate can withstand and in some cases mostly material dependent I have seen in cases it pass hours. My main question is what is the recommended adtm-d3933 material for astm-d39933 chemistry?


I know of two methods: The first is used by Boeing for adhesive bonding. I cannot talk about certain Boeing processes on an Internet website for obvious reasons but would be glad to axtm-d3933 with you in person astm-d33933 you wish. If you see an affordable copy anywhere these days, grab it: The use of this guide also provides information necessary for the development of standard specifications for adhesives. Joel, there are some very specific requirements concerning bonding using PAA.

Nonetheless, if the PAA is being called out for a pretreatment for a subsequent pressure bonding operation than the answer is no, sulphuric acid anodizing is not the coating of choice for a variety of reasons. There is very little information on this specialized process. Specifically, little protruding oxide fingers rise right up out of the aluminum – I’m not sure that a smooth surface or a rough surface would have any difference – a clean and properly deoxidized surface will behave identically given the same electrolyte, current density, etc.

I don’t think this is possible, but I thought I should at least try astn-d3933 post the question. Subscription pricing is determined by: It is then sealed using DI water in a series of two dip tanks.

Phosphoric acid anodizing is porous and provides a substrate for mechanical locking, so I suppose that is why you need it for the adhesion test. I am not an expert, but this would be my guess. The aluminum cathodes will be dissolved continually in phosphoric acid, shortening your bath life.

Phosphoric acid anodizing per BAC5555 and ASTM D3933-98

Parts must be transferred to the clean room within two hours of removal from the PAA line and be primed within 72 hours. Start pulling them apart by hand careful of sharp edgesthen put a drop of water on the joint.

Phosphoric anodizing is well known astm-d3933 being superior to sulfuric acid for bonding purposes. It is not clear to me if Phosphoric Acid Anodizing is still patented or not.


ASTM D3933 – 98(2017)

Chromic acid and other anodizing methods, while good for corrosion protection, astm-s3933 proved in asm-d3933 stress tests, e. March 16, A. A specific precaution is given in 5. Thank you in advance for your help.

You MAY be surprised by the result. We could more easily recycle the waste anodizing solution is we could convert the phosphoric acid anodizing bath to sulfuric. There is an engineering document you need to be qualified to for Boeing work.

After priming, parts can be stored before bonding. A specific atsm-d3933 is given in 5. The surface morphology of PAA, and coating thicknesses produced are much better suited to bonding operations than SAA. I am not an aircraft engineer and cannot give you an authoritative answer; but maybe this help you until someone more knowledgable steps forward.

However, many of the basic tests and ideas for quality control, etc.

This is auto racing, not aerospace, so we have some flexibility, but still cannot tolerate problems. It is not intended for the selection of materials. Experience has shown that when adhesively bonded aluminum surfaces which have been prepared in accordance with this guide produce relatively reproducible, durable bonds. Minford from Abe Books or info on Amazon A.

It is used as a astm-d9333 preparation for bonding. The use of a Ultra Violet system has been mentioned as one possible cure?

I have searched the web and cannot find much technical info. As the voice of the U. My understanding is that some of Boeing’s competition does not use this process for adhesive bonding, but rather a variant of chromic acid anodizing.