ASTM D2651 PDF
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The surface should be recleaned until the test is passed. A number in parentheses indicates the year of last reapproval. Vapor blasting by water or steam and an abrasive is the most effective method and does not warp parts, if done carefully. Current edition approved Oct.
This abstract is a brief summary of the referenced standard. The values given in parentheses are for information only. 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.
Thorough rinsing follows, usually d265 warm to hot running water. The methods may be revised or supplemented, as necessary, to include methods based on proven performance.
Do not seal asym anodized parts with boiling water before bonding. Thorough rinsing should follow.
The surface will exhibit a grey or lighter color. Good bond strengths have resulted by bonding titanium alloys that have been anodized by proprietary processes.
Parts must be bonded immediately. It is the aastm of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Hand sanding, rubbing with metal wool, and wire brushing are the least effective methods. Generally in production, a series of tanks containing the necessary solutions is arranged with overhead cranes to transport parts to be prepared. Click to learn more.
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. Worldwide Standards We can source any standard from anywhere in the world. Dry grit or sand blasting tends to warp thin sheet materials; these methods are suited only for thick-section parts. 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.
If continuous failures occur, the treating process itself should be analyzed to determine the cause of the problem. Somewhat lower bond strength results from this method compared to other methods described.
Some commercial compounds under the classi? Same mechanical methods as that employed in stainless steel and chemical etching by nitric-phosphoric acid solution may be used for carbon steel preparation.
Full-scale property tests should be run with the metal surfaces so prepared with the adhesive in question before accepting the process. 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.
ASTM D2651 – 01(2016)
A thorough rinsing with distilled water may be necessary to ensure complete removal. Initial treatment is at about 5 to 10 V. This test depends on the observation that a clean surface one that is chemically active or polar will hold a continuous? Wash, vaporize degrease, and brush or air blasted dry oil-free air surfaces to remove all traces of the abrasives. Preliminary tests should be conducted with the speci?
This method should be used only in cases where other methods cannot be used. 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. Oxidation can occur in a very short time, even before the d2561 are dry.
The useful life of solutions depends upon the number and size of the parts being prepared. Prepared surfaces can change their characteristics on standing and adhesives vary widely in their tolerance of adherend surface conditions.
Distilled water should be used in the test, and a drainage time of about 30 s should be allowed. NOTE 4—Caution should be exercised during vapor degreasing of magnesium alloys. Search all products by. Rinsing may be done by spray or by dipping in a tank in which the water is circulated and constantly being renewed by an over?
Historical Version s – view previous versions of standard. Procedures for aluminum alloys are well d265, possibly because more bonding has been done with these alloys. Peening action of any blast process d2561 work-harden the surface of some base metals.
The major problem d26511 to apply sufficient thickness of coating to prevent corrosion, but not so thick that the bond fails within the coating. Any trace of residual cleaning solution should be removed or a false conclusion may be made. 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.
The wide variety of individual alloys and heat treatments under each group, the fact that certain adhesives exhibit speci? 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.
This step is repeated if necessary until all visible contamination is removed.
ASTM D – 01() – Standard Guide for Preparation of Metal Surfaces for Adhesive Bonding
A pH reading or acid content of trichloroethane vapor degreasing solution, or both, should be obtained. Refer to the appropriate literature for details on cleaning techniques and procedures. The adhesive or adhesive primer must be applied immediately after drying. The asstm is anodically etched again using a wrapped electrode and a deep-etching solution.
This guide covers procedures for preparing various wrought metal surfaces for adhesive bonding.