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Same mechanical methods as that employed in stainless steel and chemical etching by nitric-phosphoric acid solution may be used for carbon steel preparation. Same mechanical methods as that employed in stainless steel and chemical etching by nitric-phosphoric acid solution may be used for carbon steel preparation.

After removing from any rinse the water-break test is commonly used. Solutions should be sampled periodically and analyzed for materials pertinent to the particular treatment method, such as, titration for hexavalent chromium CrO3iron, chlorides, aluminum, etc.

The application of these paste systems allows for their use in fairly controlled areas. If a water-break-free condition is not observed on the treated surface, it should not be used for bonding. A break in the water? The major problem is to apply sufficient thickness of coating to prevent corrosion, but not so thick that the bond fails within the coating. Dry grit or sand blasting tends to warp thin sheet materials; these methods are suited only for thick-section parts.

This test depends on the observation that a clean surface one that is chemically active or polar will hold a continuous?

It is informational only and not an official part of the standard; the full text of the standard itself must be referred to for its use and application. Prepared surfaces can change their characteristics on standing and adhesives vary widely in their tolerance of adherend surface conditions. Surface preparation for magnesium alloys which is closely associated with corrosion prevention shall involve vapor, alkaline-detergent solution, chromic acid, and sodium hydroxide acid degreasing; anodic treatment; and the use of conversion coatings and wash primers.


Exercise care to ensure that all abrasive materials grit, sand, cloth, sand paper, or brushes are free from contamination that may be spread or rubbed onto the steel.

The values given in parentheses are for information only. The surface should be recleaned until the test is passed. DuPont, Wilmington, DE Exercise extreme care to ensure removal of all traces of the etchant. Several commercial products are available. Investigation should be made to determine the time limitation of the adhesive and the rate of change on the surface of the adherend.

Rinsing should be sufficiently long and vigorous to assure removal of soluble residue chemicals, or particles.

NOTE 1—No entirely foolproof method exists to determine bondability of a metal surface after preparation. The use of a Series stainless steel for such equipment is suggested. Preliminary tests should be conducted to determine suitability of these processes before acceptance.

Last previous edition D astmm 90 The methods may be revised or supplemented, as necessary, asym include methods based on proven performance. Apply the adhesive immediately after the treatment. Previously bonded parts, such as honeycomb core materials, are usually not degreased due to difficulty in removing residue. NOTE 9—If treating solution is to be used for a continuous operation or reused, it should be discarded after 4 to 6 h at the temperatures in It does not address the preparation of cast metals.

ASTM D – 01() – Standard Guide for Preparation of Metal Surfaces for Adhesive Bonding

Procedures for aluminum alloys are well standardized, possibly because more bonding has been done with these alloys. It 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. Surface treatment methods involving both mechanical and chemical techniques are included for aluminum alloys, stainless steel, carbon steel, titanium alloys, magnesium alloys, and copper and copper alloys.

Other metals may be used if they are resistant to the solution used. This standard has been approved for use by agencies of the Department of Defense. Nitric acid-ferric chloride solution degreasing; sulfuric acid-dichromate-ferric sulfate solution etching; and chemical treatment by nitric-acid-sodium chlorite solutions may be used for copper and copper alloy preparation.


Vapor blasting by water or steam and an x2651 is the most effective method and does not warp parts, if done carefully. The high reactivity of magnesium requires that aastm coatings be applied for most service applications.

It produces a smut-free surface that can be treated by other chemical processes. Take the smart route to manage medical device compliance. The useful life of solutions depends upon the number and size of the parts being prepared. This is known as a water-break-free condition. Thin sheet steel may x2651 warped due to peening of the blasting abrasives. Do not seal the anodized parts with boiling water before bonding.

This step is repeated if necessary until all visible contamination is removed.

This can be accomplished by wiping aastm a e2651 wetted with a variety of commercial solvents, such as acetone, methyl ethyl ketone, lacquer thinner and naphtha. Contaminants, such as metal particles, oils, etc. Bond strengths obtained using either of these surface preparations are somewhat lower than those from the immersion processes.

Commercially available proprietary solutions may be used. Link to Active This link will always route to the current Active version of the standard. Magnesium Alloys Copper and Copper Alloys.

ASTM D2651 – 01(2016)

Usually, the time should not exceed 8 h and parts should be covered or wrapped in Kraft paper. The adhesive or adhesive primer must be applied immediately after drying. Some commercial compounds under the classi?

Sand blast, grit blast, asstm vapor hone may be used. Generally in production, a series of tanks containing the necessary solutions is arranged with overhead cranes to transport parts to be prepared.