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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March 16, A. Is it possible for an aluminum surface to have too low of a surface roughness for phosphoric acid anodizing?

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

Many factors, however, apply to shear modulus, tensile strength, and tensile modulus measured by small laboratory specimens in axtm. The aluminum cathodes will be dissolved continually in phosphoric acid, shortening your bath life.

Precision shall be reported in terms of the standard deviation of the data and the standard error of the mean. The use of a Ultra Violet system has been mentioned as one possible cure?

Medias this blog was made to help people ashm easily download or read PDF astmm. My main question is what is the recommended cathode material for this chemistry? It is the responsibility of the user of this f3933 to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

Our current system needs to be improved upon. Your Alert Profile lists the documents that will be monitored. We have tinkered with PAA over the years typically applying adhesive primer after anodizing, but anodizing is a conversion coating.

It is recommended for screening durability of surface preparation-primer-adhesive systems through the analysis of crack growth and mode and locus of joint failure.


The discoloration could be related to some of the alloying materials dissolved in solution. 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. Periodically check, clean, or replace?

I have searched the web and cannot find much technical info. Others tell me that PAA requires primer application within 3 hours of anodizing and near clean room surroundings to avoid subsequent damage. March 29, A. The values given in parentheses are for information only.

Prior to engineering your line you asstm wish to also think about production flow logistics as Ray mentioned which are critical for best results, as well as meeting most aerospace specs. We have been told that the sulfuric acid process is more temperature sensitive, and we might have to install a chiller and a heat exchanger to control the temperature. However, it is most desirable to prime parts as soon as possible to minimize the possibility of inadvertent contamination.

I am trying to set up a small bench top operation. NOTE 3—The color change may be difficult or impossible to detect on surfaces that have been etched by marking ink, roughened by machining, sanding, deburring, etc. Please first log in with a verified email before subscribing to alerts. The use of a Ultra Violet system has been mentioned as one possible cure?

Standard Guides for Automotive and Aerospace Adhesives from ASTM

Need more than one copy? Is this the fungus that I have read about or something else? It is not astj for the selection of materials. We previously had not experienced this yellow color change until we recently improved the electrical contacts and the mechanical contacts holding the parts to the racks.


Standard Guides for Automotive and Aerospace Adhesives from ASTM

I have been warned that most CAA processes use a atsm wash which destroys bondability of 2xxx series aluminums, and asttm surface must cure for 24 hours before primer is applied.

You r3933 note that PAA specifications call for the anodized parts to be stored in a “clean room” environment prior to application of the primer. I would guess that the copper from the alloy could be somewhat to blame, along with whatever dissolved out of your cathodes. The use of this guide also provides information necessary for the development of standard specifications for adhesives.

Already Subscribed to this document. You may be looking for Boeing’s BAC process. At that time, Phosphoric Anodizing was best for most structural adhesive bonding. If the anodizing tank is stainless steel, the tank itself can be the cathode.

Phosphoric acid anodizing per BAC5555 and ASTM D3933-98

Standards Subscriptions from ANSI provides a money-saving, multi-user solution for accessing standards. Minford from Abe Books or info on Amazon. Currently, Nadcap does not have a specific PAA spec, but one will be handed down soon after their quarterly meeting this month. Surfaces for Adhesive Bonding. As for my colleague, he studied the standards with the tenacity of an electrical engineer.

Standard guides for automotive and aerospace adhesives provide the proper guides for the classification, specification, preparation, and use of several adhesives on aluminum and metal surfaces.

We are researching either chromate surface conversion CAA or PAA for better bonding performance, but are getting conflicting information from various anodizing sources.