Effect of Homogebuzing Annealing Time on Corrosion Property of SiC_p/Al Composite

The effects of different annealing time on interfacial reaction of the composite were investigated at 600℃. SiC_p/Al composite interface was studied by means of metallurgical microscope, SEM, EDS and XRD. Corrosion of SiC_p/Al composite was studied by means of polarization cure. Experimental results show that:By different homogenizing annealing time of SiC_p/Al composite materials, combined with SiC particles and matrix were better without holes, at the same time Si, MgAl₄O₂ and Al₄C₃ were produced, as the extension of heat preservation time growing white appearances, white appearances were Si. The corrosion process of SiC_p/Al composite under different annealing was controlled by actibation. With increasing heat treatment time,corrosion potential was constant,corrosion rate of SiC_p/Al composite was first decreasing and then increasing, At the time of 3 h corrosion rate was minimum,and corrosion current was minimum value5.3E-6 A/cm², resistance value of EIS was first increasing and then decreasing, At the time of 3 h it was maximum value 3.41E4 Ω·cm².