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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Phosphoric acid anodizing is done with stainless steel cathodes.
Phosphoric acid anodizing per BAC5555 and ASTM D3933-98
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The spec can be obtained from Boeing commercial division or from some specification clearing houses like aerospheres. Very straight forward and the cheapest good reference. The use of a Ultra Violet system has been mentioned as one possible cure?
This is auto racing, not aerospace, so we have some flexibility, but still cannot tolerate problems. Others tell me that PAA requires primer application within 3 hours of anodizing and near clean room surroundings to avoid subsequent damage.
Phosphoric Acid Anodizing (PAA Process, primarily for adhesive bonding of aluminum)
Ashm method may be revised or supplemented, as necessary, to include methods based on proven performance. Our PAA plater is getting hardware no roughness specified where the surface has a mirror like finish, probably a RMS. This seemingly daunting task did not faze him, however, as he had ample time to devote to it. It is reference book time. We previously d not experienced this yellow color change until we recently improved the electrical contacts and the mechanical contacts holding the parts to the racks.
The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard. His work was proceeding smoothly — that is — until he was faced with proving that the adhesives he planned to use would be compatible with multiple materials and substrates. Sorry for the non-definitive answer.
After all, he had unlimited time, but not unlimited money. This standard is not included in any packages. This guide describes one method on how to properly prepare aluminum surfaces can be obtained. Phosphoric acid anodizing PAA is used to give aluminum a good tooth for adhesive bonding. I am ast to set up a small bench top operation.
Improper surface preparation can produce seemingly acceptable bonds that can degrade rapidly with time. Your Alert Profile lists the documents that will be monitored. In these cases, the presence of color on tool tabs or on the opposite surface, or on undisturbed surfaces, may be evidence that the surface is acceptably anodized.
The method may be revised or supplemented, as necessary, to include methods based on proven v3933.
Prior to engineering your line you may wish to also think about production flow logistics as Ray mentioned which are critical for best results, as well as meeting most aerospace specs. First of all, you probably want to use stainless steel cathodes instead of aluminum for PAA. 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.
It d39333 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. Phosphoric acid anodizing is porous and provides a substrate axtm mechanical locking, so I suppose that is why you aatm it for the adhesion test.
Standard Guides for Automotive and Aerospace Adhesives from ASTM
Please first verify your email before subscribing to alerts. However, it is most desirable to prime parts as soon as possible to minimize the possibility of inadvertent contamination. D9333 standard is not included in any packages.
Periodically check, clean, or replace? Techniques for Adhesives by R. The Working Properties Subcommittee D Of course, c3933 was only the beginning: He had to define many material characteristics and ultimately prove that the product would be functional, durable and corrosion-resistant in the aggressive transportation environment, which was no easy feat.
People in our composites group are pushing the electroplating facility to install a phosphoric anodizing process to prep aluminum for adhesive bonding. I am not an aircraft engineer and cannot give you an authoritative answer; but maybe x3933 help you until someone more knowledgable steps forward. I know of two methods: Further, how could he verify supplier data found on a typical technical data sheet TDS in a manner that would be universally accepted as adhering no pun intended to good scientific and documentation principles without necessarily running every adhesives d9333 known to the automotive world?
Does the spent solution turn yellow ast continued use? Phosphoric anodizing is well known as being superior to sulfuric acid for bonding purposes. At that time, Phosphoric Anodizing was best for most structural adhesive bonding. The discoloration could be related to some of the alloying materials dissolved in solution.
You may be looking for Boeing’s BAC process. It’s zstm possible to diagnose a finishing problem or the hazards of an operation via these pages.