ASTM D Standard Recommended Practice for Preparation of Metal. Surfaces for Adhesive Bonding. ASTM D Standard Guide for. D – Designation: D – 98 AMERICAN SOCIETY FOR TESTING PA Reprinted from the Annual Book of ASTM Standards. D, Method r, and ASTM E involves the etching of aluminum dure is described in ASTM D and involves the application of.

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Our PAA plater is getting hardware no roughness specified where the surface has a mirror like finish, probably a RMS. I was hoping someone could suggest a xstm technique for the acid tanks to keep chloride and fluoride levels down d33933 acceptable levels 35 ppm for chloride, 75 ppm for fluoride.

Phosphoric acid anodizing PAA is used to give aluminum a good tooth for adhesive bonding. I am trying out Phosphoric Acid anodizing for a new customer.

It is not intended for the selection of materials. Hi, Krag and Jeff. There are better, but cost a lot more. I would suggest starting there with some of the engineering requirements then go to the PAA spec. Thanks you for your input regarding the suitability of sulphuric acid anodizing as a substitute for PAA. Please first log in with a verified email before subscribing to alerts. With aluminum playing a larger role in vehicle production, surface preparation of that naturally aging substrate is critical to achieving bonding success.

Can anyone tell me what equipment is needed to phosphoric anodize aluminum? PAA is used to prepare the aluminum surface for acceptance of the primer before bonding. It is not clear to me if Phosphoric Acid Anodizing is still patented or not. You may be looking for Boeing’s BAC process. Add to Alert PDF. Will it require a different sealer, such as with sodium chromate? If you want a quick and dirty demonstration, make standard peel test specimens from candidate surface preps.


We have no amendments or corrections for this standard. Causes of such differences may be? First of all, you probably want to use stainless steel cathodes instead of aluminum for PAA. To that end, ASTM D Standard Guide for Preparation of Aluminum Surfaces for Structural Adhesives Bondingreleased in and updated inis critical for structural adhesives bonding since aluminum surfaces degrade over time.

What is the temp of those tanks? A specific precaution is given in 5.

Also, are wstm any alternative platings that can produce the same results? Of course, that was only the beginning: Can you help me with a process for Phosphoric acid anodizing.

We have been told that the sulfuric acid process is more temperature adtm, and we might have to install a chiller and a heat exchanger to control the temperature. The Working Properties Subcommittee D The values given in parentheses are for information only.

Standard Guides for Automotive and Aerospace Adhesives from ASTM

We have no amendments or corrections for aatm standard. Already Subscribed to this document. My colleague, being the inventive sort, had developed a multipurpose product with potential use in transportation OEM applications. These control specimens should exceed the minimum strength and durability requirements. Many factors, however, apply to shear modulus, tensile strength, and tensile modulus measured by small laboratory specimens in general.

The phosphoric acid anodized sheets are then pressure bonded. The discoloration could be related to some of the alloying materials dissolved in solution. The method may be revised or zstm, as necessary, to include methods based on proven performance.

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. The colors most frequently seen are purple, yellow, blue, and green hues.


This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

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

This seemingly daunting task did not faze him, however, as he had ample time to devote to it. There are very stringent requirements for application and inspection of phosphoric acid anodized parts [for aerospace application]. I am not an expert, but this would be my guess. Precision and Bias 9. Aastm is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Standard Guides for Automotive and Aerospace Adhesives from ASTM

See D [link by ed. Standard guides for automotive and aerospace adhesives provide the proper guides for the classification, specification, preparation, and use of x3933 adhesives on aluminum and metal surfaces. The aluminum cathodes will be dissolved continually in phosphoric acid, shortening your bath life. If you want a quick and dirty demonstration, s3933 standard peel test specimens from candidate surface preps. Minford d39333 Abe Books or info on Amazon A. Sorry for the non-definitive answer.

James’ recommendation was fromand even then the “Light Metals Finishing Process Manual” was quite hard to find. I have been warned that most CAA processes use a fluorine wash which destroys bondability of 2xxx series aluminums, and that surface must cure for 24 hours before primer is applied.