ANALYSIS OF PHYSICAL AND MECHANICAL PROPERTIES OF GALVANIC-PLASMA WEAR-RESISTANT COATINGS.

This article shows the possibility of creating high wear-resistant and corrosion-resistant coating by Galvanic-Plasma Modification (GPM) on the AlSi12Cu aluminum alloy. The combination of influencing parameters during processing allows to influence the set of quality indicators of coating, such as the thickness of the coating layer, microhardness, porosity, phase and elemental composition. The influence of technological modes and electrolyte composition on the structure and composition of the resulting coating has been established. The structural features of the modified layers were investigated, the effect of the capacitor capacitance on the installation and the duration of treatment on the structure and microhardness of the resulting coating was established. The tribological properties of the different GPM surfaces had been evaluated by usage of the 'pin-on-disk' method. Different current densities were chosen to represent the arrangement component of the GPM layer. Wear test results were used to evaluate the wear resistance ability of the various GPM layers and for establishing a wear model. The surface morphology, porosity distribution on cross-section, and worn surface of the GPM layers were characterized using a scanning electron microscope (SEM). Different material counterparts and contact conditions were applied to simulate a variety of practical states. The results show that the hardness of the GPM layer formed on sample M5 was the highest among the five kinds of samples. The GPM layer formed on sample M5 has the best wear resistance. This can be ascribed to the different size and appropriation of the pores and the diverse proportion of α to the γ stage in the GPM layers, when exposed to various limitations during the GPM cycle. [ABSTRACT FROM AUTHOR]