FeCoCrNiMnAl_x high-entropy alloy (HEA) cladding layers were successfully fabricated on H13 steel by laser cladding. The microstructure and properties of the FeCoCrNiMnAl_x HEA cladding layers were systematically studied. The influence of Al content on high-temperature wear resistance of HEAs was investigated by depth-of-field microscopy, XRD, SEM and EDS. Addition of Al element affected the mechanism of oxidation and strengthening of the cladding layers, and effectively promoted its anti-oxidant and abrasion resistance. Compared with the FeCoCrNiMn cladding layer, the FeCoCrNiMnAl_0.75 cladding layer enhanced the anti-plastic deformation capacity by 7.1% and reduced oxidation weight gain and total wear weight loss at high temperature by 36.79% and 79.0%, respectively. The wear mechanisms of the cladding layer at high temperature were mainly oxidation wear and abrasive wear, while adhesive wear took a backseat.

The native and chemically modified corncobs were utilized as low-cost and efficient adsorbent to remove bromate from aqueous solution in this study. The parameters of the adsorbent i.e. adsorption capacity, selectivity, regenerability were investigated. All the experiments were conducted at the same adsorbent dose (0.2 g/200 ml) and the same temperature of 30°C to investigate the effects of initial concentration of bromate, contact time, ionic strength and solution pH, then the optimal experimental conditions were ascertained. The results showed that the optimum conditions for the removal of bromate were at the aqueous solution with low ion concentration, pH of about 9.0 and equilibrium time of 80 min, respectively. Freundlich model fi tted the adsorption data quite reasonably (R2 > 0.92) and the maximum adsorption capacity was 101.01 mg/g. The experimental data followed the pseudo-second-order kinetic model very well. In addition, the removal percentages (%) of bromate by corncob modifi ed by 80% isoprop...