Evaluation of Corrosion Resistance of Aluminium-Silicon Carbide Composites for Thermal Application

Abstract

Aluminium- silicon carbide (Al- SiC) has garnered attention recently due to its advantageous features. Effects of uniform corrosion and pitting corrosion susceptibility of Al-SiC composites in HCl solution were investigated using cyclic potentiodynamic polarization for thermal application. Surface morphology of Al- SiC composites was examined by scanning electron microscope (SEM) and energy Dispersive spec- troscopy (EDS). This study was complemented by examining elemental compositions of various compos- ites through surface analysis methods. Results revealed that composites sintered for 2 hours at 550 °C exhibited a decrease in the rate of uniform corrosion and a diminished susceptibility to pitting corrosion when the solution temperature was elevated. Extending the sintering time for composite to 3 hours led to an enhancement in uniform corrosion, while concurrently mitigating the incidence of pitting corrosion. Uniform corrosion of sintered composites showed a significant dependence on sintering time with increas- ing temperature. Sintering time can potentially affect grain size, resulting in a corrosion behavior.