Publikacje

Abstract:

The corrosion resistance of C45 carbon steel coated with WC-Cu (at different composition) electrospark deposition (ESD), and the influence of the laser treatment on the properties of the coatings were examined in acid chloride environment. The potentiodynamic polarization technique was mainly used. The surface topography was assessed using a scanning electron microscope (SEM). The following layer structures were observed: homogeneous in the case of Cu and heterogeneous in the case of WC-Cu. The structure of the coatings depends on the composition of the electrodes. Steel coated with a nanopowders mixture containing 25% WC and 75% Cu proved to be the most resistant to corrosion. The laser treatment causes the homogenization of the chemical composition, the structure refinement and the healing of microcracks and pores of the ESD coatings. The corrosion rate in case laser treatment of WC25-Cu75 coating is about three times slower comparing to coating without laser irradiation.

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Influence of Laser Treatment on the Corrosive Resistance of WC-Cu Coating Produced by Electrospark Deposition