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Satisfactory surface preparations have been accomplished by using paste-type etchants. D26551 production bonding of complicated or large parts, the time interval may exceed 8 h.
ASTM International – Standard References for ASTM D – 01()
A number in parentheses indicates the year of last reapproval. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility. These paste systems can be made by adding fumed silica to the sulfuric-dichromic acid solutions. The surface will exhibit a grey or lighter color.
Commercial vapor degreasing equipment is usually used. If continuous failures occur, the treating process itself should be analyzed to determine the cause of the problem.
Thorough rinsing follows, usually in warm to hot running water. The surface is anodically etched again using a wrapped electrode and a deep-etching solution. Apply the adhesive immediately after the treatment. S2651 does not address the preparation of cast metals. NOTE 1—No entirely foolproof method exists to determine bondability of a metal surface after preparation.
Generally in production, a series of tanks containing the necessary solutions is arranged with overhead s2651 to transport parts to be prepared.
Especially detrimental are paint or other spraying operations, processes using powdered materials, oil vapors from pumps and other machinery and spraying of mold release agents. The etching time is generally 10 to 20 min. 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.
Link to Active This link will always route to the current Active version of the standard. 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.
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.
Oxidation can occur d265 a very short time, even before the parts are dry. Sand blast, grit blast, or vapor hone may be used.
This method should be used only in cases where other methods cannot be used. Same mechanical methods as that employed in stainless steel and chemical etching by nitric-phosphoric acid solution may be used for carbon steel preparation. Please download Chrome or Firefox or view our browser tips. Adhesive bonds surface preparationCarbon steel, Copper, Copper alloy, Magnesium alloys, Metallic adhesives, Metal-to-metal contact, Stainless steel, Titanium alloys, Aluminum alloys-surface preparation for adhesive, bonding, Bond strength-adhesives metal-to-metalSurface preparation-adhesive bonding.
It does not address the preparation of cast metals. The methods may be revised or supplemented, as necessary, to include methods based on proven performance.
Previously bonded parts, such as honeycomb core materials, are usually not degreased due to difficulty in removing residue. Procedures for aluminum alloys are well standardized, possibly because more bonding has been done with these alloys.
It produces a smut-free surface that can be treated by other chemical processes. Prepared surfaces can change their characteristics on standing and adhesives vary widely in their tolerance of adherend surface conditions.
ASTM D2651 – 01(2016)
Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. The surface should be recleaned until the test is passed.
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