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Importance of Surface and Interface Characterization Dr. Amir Hussain, Christa Pflugbeil COMTECH GmbH - Labor für Kunststoffe comtech-labor.de,

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Presentation on theme: "Importance of Surface and Interface Characterization Dr. Amir Hussain, Christa Pflugbeil COMTECH GmbH - Labor für Kunststoffe comtech-labor.de,"— Presentation transcript:

1 Importance of Surface and Interface Characterization Dr. Amir Hussain, Christa Pflugbeil COMTECH GmbH - Labor für Kunststoffe comtech-labor.de, Investigation of Surface – Related Adhesion Failure

2 Materials and Surfaces „Materials are indifferent, but the use we make of them is not a matter of indifference.“ (Epictetus AD) „GOD made materials but surfaces were the work of the DEVIL“ (Pauli)

3 Typical Structure of a Substrate Surface Contaminationsca. 2-4 nmContaminationsca. 2-4 nm eg. Grease, Wax, Oil, Silicone, Tenside Adsorbed Layersca. 0,5-1 nmAdsorbed Layersca. 0,5-1 nm eg. Hydrocarbon, CO 2, H 2 O Reacted Layersca. 3-7 nmReacted Layersca. 3-7 nm eg. Me-O, Me-O-H Bulk MaterialBulk Material

4 Scope and Limits of Surface Analytical Techniques TechniqueSensitivityDepthQuantification Molecular Structure FTIR > 1000 ppm> 100 ppmIndirect very good ESCA 1000 ppm1-5 nmdirectgood TOFSIMS < 0.1 ppm< 1 nmIndirect very good

5 Lubricants / Contaminations detected on failed coating at the steel-FBE-interface Silocones (PDMS) Stearates / Fat Stearmide

6 Typical Contaminations on a Disbonded Interface (sample A) detected by ToFSIMS

7

8 Surface Contamination Surface Contamination is the most dangerous enemy of surface engeneering A controlled (pretreated) surface is more important than a perfect clean one Surface Analysis is the most effectice weapon against this enemy

9 Main Causes of Adhesive Failure in protective Coatings 65% Surface / Interface 20% Applications 15% Materials


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