ADHESIVES, GLUES AND SEALANTS
What is surfaces analysis?
The surface analysis is defined as the set of techniques which allow us to identify the atomic structure and chemistry state and composition of a material, the elements or compounds that are located on the surface of the material, and the interactions that take place in the interfaces of materials.
Using these surface analysis techniques, allows us to :
Evaluate and optimize processes for surface preparation.
Evaluate the system of protection against corrosion.
Investigate and understand the processes of adhesion and rupture of the adhesives on the substrates.
Analysis of failure in adhesive joints
Characterization and determination of the phenomena of ageing and degradation.
Among the surface analysis techniques can include:
XPS - X-ray Photoelectron Spectroscopy
AES - Auger Electron Spectroscopy
Energy Dispersive X-EDX ray
SSIM - Spectroscopy of secondary ion mass
SPM - Scanning Probe Microscopy
The XPS technique bases its operation on the emission of high-speed electrons which hit the surface and bounce with slower speed, an electron detector collects and analyzes the speed at which they bounced. Through this information we can identify and quantify components that form or that are in the surface of a material and its chemical state.
For example by using XPS we can identify and quantify the presence of silicon on a surface, which prevent good adhesion of the adhesive to the substrate.
The use of these techniques is very limited due to the high cost of purchasing the machines and the high degree of specialization needed for its operation and interpretation of data. But the information that gives us the use of these techniques can help to improve the quality and the productivity of adhesive processes.
In the future the idea would be to integrate these techniques during the production process, so that once the substrate surface preparation will assess their state for proceeding with the application of the adhesive, so that one obtains a quality process controlled and fully automated.
Of all the techniques described above, it should be mentioned an entire article to PMS or scanning probe microscopy, by which we can photograph at nanomolecular level the state and composition of a surface, this technique offers high-resolution images of the surface at level of nanoscale, allowing in a depth study and in a better understanding of the phenomenon of adhesion.
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