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Importance of Surface and Interface Characterization

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

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Importance of Surface and Interface Characterization

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  1. Investigation of Surface – Related Adhesion Failure Importance of Surface and Interface Characterization Dr. Amir Hussain, Christa PflugbeilCOMTECH GmbH - Labor für Kunststoffecomtech-labor.de, info@comtech-labor.de

  2. Materials and Surfaces „Materials are indifferent, but the use we make of them is not a matter of indifference.“ (Epictetus 50 - 100 AD) „GOD made materials but surfaces were the work of the DEVIL“ (Pauli)

  3. Typical Structure of a Substrate Surface • Contaminations ca. 2-4 nm eg. Grease, Wax, Oil, Silicone, Tenside • Adsorbed Layers ca. 0,5-1 nm eg. Hydrocarbon, CO2 , H2O • Reacted Layers ca. 3-7 nm eg. Me-O, Me-O-H • Bulk Material

  4. Scope and Limits of Surface Analytical Techniques

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

  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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