This paper presents the results of investigation considering the morphology of surface layers produced by electro-spark deposition (ESD). It is a pulsed micro-welding process used for small scale and precision repair of high value worn or misfabricated components. The consumable electrode material is deposited onto the work piece by means of electric sparks in a manner reverse to spark erosion. In the electro-spark deposition process, the electrode is the anode and the work piece is the cathode. It has been found that the surface layer produced by ESD has good criteria resistance by changing the process parameters and promising protective properties. In the experiment, the coatings were electro-spark deposited with using an Alloy 400 electrode (the anode) - onto samples made of CuZN30 Bras (the cathode). The morphology of the layers is shown in the OM and SEM photomicrographs. As a result of the electric discharge, diffusion of individual elements was observed. For diffusion observations, ESD analyzes were performed on the cross-section of the produced layer. Microhardness measurements were also carried out.Keywords: Electro-spark deposition, ESD, alloy 400, protective coatings, microstructure
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