ANALYSIS OF TRIBOLOGICAL WEAR OF METALLICMEMBRANES AFTER THE HYDROGENATION PROCESS

Abstract

The paper presents the results of tribological tests of copper material subjected to the cyclic hydrogenationprocess. Tribological tests during friction in reciprocating motion, in contact with a ceramic ball. Themeasurement was performed for different numbers of hydrogenation cycles, different surface roughnessand different times after the machining process. The test material consisted of metallic membranes made ofdendritic copper particles using the additive method of low-pressure cold gas spraying (LPCS). The hydrogencharging process was carried out using a BioLogis SP50ze potentiostat/galvanostat. The current waveformswere carried out in an electrolyte with a concentration of 0.5 M H2SO4. Voltammetry (CV measurement)was performed in a three-electrode system, where the metallic membrane was the working electrode. Thehydrogen charging process included two ranges: 25 cycles (1 hour) and 50 cycles (2 hours). The system wascyclically loaded with current between a potential of -0.200 V and -1.4 V, with a scanning rate of 20 mV/s.The tests carried out allowed for obtaining the values of the friction coefficient and the wear depth. Formaterials with a developed surface (high roughness), a decrease in the value of the friction coefficient and thedepth of the wear trace was observed with an increase in the number of hydrogenation cycles. This indicatesan increase in the amount of hydrogen in the rubbing surface by expanding the surface. In the case of polishedsamples, the best results were obtained with 25 hydrogenation cycles.