Adhesive bonding surfaces

The interfacial adhesive bond surfaces generated as a result of corrosion induced failure (for adhesives C and E) have been examined using x-ray photoelectron spectroscopy. The results of these studies are shown in Table III and Figures 1 and 2. Changes in... 

Because of their high thermal stability and excellent resistance to solvent, fluorocarbons cannot be joined by solvent cementing, and they are very difficult to join by thermal welding methods. Because of their inertness and low surface energy, they also tend to be difficult materials to join by adhesive bonding. Surface treatment is necessary for any practical bond strength to the fluorocarbon parts. 

D 3762 Test Method for Adhesive Bonded Surface Durability of Aluminum... 

EIS can also detect defects arising from lack of adhesion at adhesively bonded surfaces (111). The presence of such defects produces pronounced changes in the character of the data presented either in complex plane plots or in Bode plots. Figure 38 illustrates the measurement configuration and provides examples of EIS data for defective and defect-free samples. Studies have shown that the presence of defects is readily revealed and that the geometry of the defects and their spatial extent can be inferred from a detailed analysis of EIS spectra. 

For many industrial applications of polyolefin materials that depend on adhesive bonding, surface treatment by cold plasma became preferred in industrial process. The plasma treatment is a surface modification process by which the bulk properties of the material are retained [51]. Plasma surface treatment is a very effective way to... 

ASTM D3762-79 (83). Adhesive-bonded Surface Durability of Aluminium (Wedge Test), Annual Book of Standards, 15.06, American Society for Testing and Materials, 1986. 

Marceau, J.A. et al. A wedge test for evaluating adhesive-bonded surface durability. Adhesives Age, October 1977, pp. 28-34. 

ASTM D3762-03 Standard test method for adhesive bonded surface durability of aluminum (wedge test). 

When a moulded joint has failed due to adhesive failure and none of the members is damaged, the joint may be reassembled using adhesive bonding. Surfaces shall be treated according to 5.3.1.5 prior to bonding. 

As with adhesive bonding, surface treatment emd cleanliness is of primary importance when decorating plastic parts. Prior to decoration, the svirface of the plastic part must be cleaned of mold release, internal plastics lubricants, and plasticizers. Plastic parts can also become electrostatically charged and attract dust. This could disrupt the even flow of a coating or interfere with adhesion. Solvent or destaticizers may be used to clean and eliminate static from plastic parts prior to decorating. Cleaning of the plastic part requires an understanding of the plastic material to be cleaned and the effect of the solvents and processes on that plastic. 

Adhesive Bonded Surface Durability of Aluminum (Wedge Test) (D 3762) Working Life of Liquid or Paste Adhesive by Consistency and Bond Strength, Test for (D 1338)... 

Keywords adhesion, adhesive bonding, surface treatment, corona treatment, flame treatment, chemical etching, surface tension, plasma treatment, pressure-sensitive adhesive, adhesive bond strength, adhesive bond durability. 

The history of airplane corrosion testing includes many successful tests that are now performed routinely, e.g., ASTM G 85 Annex A2 and ASTM G 44. Some other successful tests, such as the wedge test (ASTM D 3762, Test Method for Adhesive-Bonded Surface Durability of Aluminum), discovered as a result of bond line corrosion problems on airplanes, are not described here because they are not strictly corrosion tests. Many of the tests described here are ASTM standards. With others, standardization is being pursued, e.g., electrochemical impedance, or ANCIT (Aluminum-Nitrate Chloride Immersion Test), to replace EXCO [4], Corrosion may never be totally eliminated from an airplane however, further refinements in corrosion testing, made... 

ASTM D 3762. (1981). Standard test method for adhesive-bonded surface durability of aluminum (wedge test), Part 22 wood adhesives. American Society for Testing and Materials, West Conshohoken, PA. 

Polymers exhibit excellent physical and chemical properties, relatively inexpensive, and easy to process. However, very often they do not possess the surface properties needed for better adhesive bonding. They are hydrophobic in nature and in general exhibit insufficient adhesive bond strength due to relatively low surface energy (Chan et al. 1996). Therefore, in terms of successful application of polymers to form structural parts using adhesive bonding, surface properties like hydrophiKcity and roughness are essentia] (Noeske et al. 2004). Due to these reasons, modification of polymeric surface is the most important factor. The main purpose of surface preparation is to improve the adhesion properties to such an extent that the interfacial failure from polymer to adhesive does not take place. 

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