Automotive clearcoats are subjected to physical, chemical and mechanical damage among which scratch and mar damage play a key role. Car wash brushes are the standard environmental source of scratch and mar damage. Most car manufacturers and most of their suppliers have been using functional tests like rubbing the coating with an abrasive and measuring the level of darnage. These tests are only a qualitative way to assess the scratch resistance of clearcoats. Keeping in mind that mechanical properties would be useful in characterising coatings, our method of investigation is based on the use of a stylus to deform the coating surface in a controlled manner. Previously, optical and scanning probe microscope imaging of tests panels brushed by an automated car wash simulator had revealed both plastic scratches and fractures. Then, we have tried to reproduce this kind of scratches by controlling mechanical parameters such as the applied load, the deformation and the strain rate. First, mechanical properties of the clearcoats are measured in indentation tests. Secondly, scratching tests providing greater strain rates allow to extend the indentation results. Finally, indentation tests at controlled ternperature have been carried out. For the first time, the evolution of the hardness versus the strain rate at different temperatures has been measured, putting forward the temperature influence.


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    Titel :

    Mar and search resistance of automotive clearcoats: development of new testing methods to improve coatings


    Weitere Titelangaben:

    Prüfung der Kratzfestigkeit der Fahrzeug-Klarlacküberzüge: Entwicklung von neuen Testverfahren zur Verbesserung der Beschichtungen


    Beteiligte:
    Bertrand-Lambotte, P. (Autor:in) / Loubet, J.L. (Autor:in) / Verpy, C. (Autor:in)


    Erscheinungsdatum :

    2001


    Format / Umfang :

    11 Seiten, 20 Bilder, 4 Tabellen, 16 Quellen



    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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