Regensburg 2019 – wissenschaftliches Programm

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 14: Postersession KFM

KFM 14.26: Poster

Mittwoch, 3. April 2019, 16:00–18:30, Poster C

Investigation of an inline detection system for conversion coatings on aluminum alloys by means of specular reflectance — •Yannic Toschke1, Jörg Rischmüller1, Mirco Imlau1, Simon Podendorf1, Mareike Schlag2, Kai Brune2, and Hauke Brüning21School of Physics, Osnabrueck University, Barbarastraße 7, 49076 Osnabrueck, Germany — 2Fraunhofer IFAM, Wiener Strasse 12, 28359 Bremen, Germany

In accordance with Europe*s REACH agreements 2017 (Regulation on Registration, Evaluation, Authorisation and Restriction of Chemicals) restrictions of conversion coatings for metallic surfaces containing Cr+6 have further led to investigations of suitable alternatives. Reasoning behind those restrictions were the confirmed carcinogenic properties of hexavalent Chromium. One possible approach comparable in its corrosion inhibition and function as adhesion agent consists of Cr+3 and Zr+4. Precise control of the process parameters is crucial for the performance of any kind of coating. Therefore, an additional method for inline quality control is desired. In this study a reliable and non-destructive method based on specular reflectance will be discussed matching those requirements. Five different qualities of the given conversion coat (20-70 nm) were applied on two different aluminum alloys (AA3003 and AA6060) and investigated with REM, LIBS and corrosion tests. Differentiation between each coating and the uncoated substrate are shown. Correlation between the gathered measurements suggests that an affordable method for inline quality control was found. Prime influence seems to arise from the morphology of the coating.

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