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The aim of the project was to test techniques for applying thin coatings to thin sheet steel during manufacture, if necessary during continuous annealing. These coatings are for temporary protection from 'flying' rust until the next stage of manufacture and should suppress the phospatisability of the steel as little as possible. In the laboratory apparatus constructed, coating was done using CVD reactions with titanium carbide or titanium nitride, and also by nitration producing a surface deposit of epsilon-nitride or gamma-nitride. Thickness, structure and chemical composition of the coating were determined with the help of Auger electron spectroscopy and sputter profiles. The coated iron samples were subjected to a rusting test: four days in moist air with 10 ppm SO(2). Zinc dip phosphatising was used to test their phosphatisability. Further characterisation of the coating and the phosphate layers was obtained using raster electron microscopy, cyclovoltammetry and impedance spectroscopy.

Additional information

Authors: MÜLLER-LORENZ E M, Max-Planck Institut für Eisenforschung GmbH, Düsseldorf (DE);GRABKE H J, Max-Planck Institut für Eisenforschung GmbH, Düsseldorf (DE);MULLER-LORENZ E M, Max-Planck Institut fur Eisenforschung GmbH, Dusseldorf (DE)
Bibliographic Reference: EUR 14437 DE (1993) 38 pp., FS, ECU 7
Availability: (2)
ISBN: ISBN 92-826-5884-8
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