Effect of electro-spark deposition process parameter on WC coating thickness of H13 steel surface

A simple and effective surface coating technique, electro spark deposition (ESD), has been used to produce WC coatings onto H13 steel surface. Influence of process parameter (output voltage, output capacitance, discharge frequency, specific deposition time at el) on the coating thickness was studied. It can be seen, choose output voltage 80V, output capacitance180 mu F, discharge frequency 2000 Hz, specific deposition time 8min/cm(2) obtained to optimal overall quality of coating. The morphology and microstructure of coatings were analyzed using scanning electron microscopy (SEM). The WC coating had an average thickness of about 60 gm and formed metallurgical bonding with the substrate.