Published by on January 17, 2020
Categories: Automotive

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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I am looking for technical information on PAA phosphoric acid anodizing. The preparation of the metallic substrates to obtain surfaces with appropriate characteristics is a critical step. I would suggest starting there with some of the engineering requirements then go to the PAA spec.

I would guess that the copper from the alloy could be somewhat to blame, along with whatever dissolved out of your ashm.

The next best process to PAA would be any method of etching the aluminum surface to roughen the profile. Precision shall be reported in terms of the standard deviation of the data and the standard error of the mean.

Wegman published by Noyes publications. If the document is revised or amended, you will be notified by email. We would like to know if it is it normal for the solution to turn a yellow color after processing. This discussion is limited to single-lap specimens and shear strength only for simplification. Need more than one copy? Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Standard Guides for Automotive and Aerospace Adhesives from ASTM

Thanks you for your input regarding the suitability of sulphuric acid anodizing as a atsm for PAA. Is it possible astj an aluminum surface to have too low of a surface roughness for phosphoric acid anodizing? The main d3933, downtown, used to have one of the finest libraries going. Our PAA plater is getting hardware no roughness specified where the surface has a mirror like finish, probably a RMS.


It is not clear to me if Phosphoric Acid Anodizing is still patented or not. 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. When we wrote it some years ago, it contained just about everything we wanted for aerospace structural adhesive bonding.

Phosphoric acid anodizing per BAC5555 and ASTM D3933-98

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 use. The method may be revised or supplemented, as necessary, to include methods based on proven performance.

Improper surface preparation can produce seemingly acceptable bonds that can degrade rapidly with time. PAA is used to prepare the aluminum surface for acceptance of the primer before bonding. There astk very stringent requirements for application and inspection of phosphoric acid anodized parts [for aerospace application]. At that time, Phosphoric Anodizing was best for most structural adhesive bonding. Already Subscribed to this document.

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

Avoid breathing solution mists or vapors. This guide describes one method xstm how to properly prepare aluminum surfaces can be obtained. The values given in parentheses are mathematical conversions to SI units that are provided for information only and are not considered standard.

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Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. I have searched the web and cannot find much technical info. I need info like tank liners, cathode material, voltage and amp requirements, bath temp, etc. I know of two methods: My company is co-molding forged aluminum inserts into a carbon fibre component for the auto racing industry.


The phosphoric acid anodized d333 are then pressure bonded. Please first verify your email before subscribing to alerts.

This is auto racing, not aerospace, so we have some flexibility, but still cannot tolerate problems. We have no amendments or corrections for this standard. The values given in parentheses are for information only. This test method is also useful for providing information on the durability of other metals and plastics, provided thickness and rigidity are considered. This standard is not included in any packages.

A specific precaution is given in 5.

Will it require a different sealer, such as with sodium chromate? The use of a Ultra Violet system has been mentioned as one possible cure?

It is then sealed using DI water in a series of two dip tanks. I don’t know if the patents have run out on BAC or not — you’d have to do a patent search.

Standard Guides for Automotive and Aerospace Adhesives from ASTM

Subscription pricing is determined by: Many factors, however, apply to shear modulus, tensile strength, and tensile modulus measured by small laboratory specimens in general. Also, PAA anodizers say you can laminate carbon skins directly to the converted surface without galvanic problems, but other coatings still require a glass barrier.

However, it is most desirable to prime parts as soon as possible to minimize the possibility of inadvertent contamination.