Interfacial morphology and tribo-corrosion behaviour of Fe-15.3 wt % Cr-3.1 wt % B-6.2 wt % Mo alloy in molten aluminium

Add time:07/29/2019    Source:sciencedirect.com

In the aluminium processing industry, the tribo-corrosion of a metal by molten aluminium or its alloys is an urgent problem, as the removal of the corrosion products leads to material losses and even failure. Therefore, a novel Fe-15.3 wt % Cr-3.1 wt % B-6.2 wt % Mo alloy was designed, and its interfacial morphologies and tribo-corrosion behaviour in molten aluminium at 750 °C under different experimental rotation speeds and loads were systematically investigated to understand the effect of molten aluminium via the ring-on-block test (the counter-body, which was 50% of the sliding couple, was produced by Si3N4). The results show that the designed alloy exhibits better tribo-corrosion resistance than H13 steel does (for example, at a load of 10 N and a rotation speed of 300 mm s−1, the volume loss rate of the novel Fe-15.3 wt % Cr-3.1 wt % B-6.2 wt % Mo alloy is 87.5% lower than that of H13 steel) due to the protective capability of the M2B-type (M = Fe, Cr, Mo) boride. The scanning electron microscopy (SEM), X-ray diffractometer (XRD), electron probe microanalyses (EPMA) and transmission electron microscope (TEM) analyses of the tribo-corrosion interface indicated that the tribo-corrosion of the designed alloy in molten aluminium involved physical, chemical and mechanical processes. The wear-induced mechanical effect exacerbated the tribo-corrosion interface via the initiation and propagation of micro-cracks. Meanwhile, the wear-intensified mechanical effect resulted in the failure of the M2B-type boride, which in turn facilitated matrix corrosion and accelerated tribo-corrosion.

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