Corrosion behavior assessment of finely dispersed and highly uniform Al/B4C/SiC hybrid composite fabricated via accumulative roll bonding process

• Monolithic Al and Al/B4C/SiC hybrid composites with different B4C-SiC content were produced by ARB.
• SEM micrographs showed that distribution of B4C and SiC in Al matrix after 9 cycles is uniform.
• EIS results revealed that implementing ARB process led to higher polarization resistance.
• Polarization curves showed that icorr decreases with increasing number of ARB cycles.

For the first time, the corrosion behavior of Al/B4C/SiC hybrid composites fabricated by accumulative roll bonding (ARB) processes was investigated. The produced hybrid composites which were consisted of 1 and 2.5 wt.% of B4C and SiC reinforcement particles by nine ARB cycles showed a homogeneous distribution and strong bonding between particles and matrix without any porosity. In order to characterize the corrosion behavior of the produced hybrid composites, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization in 3.5 wt.% NaCl solution were carried out. Moreover, for the better understanding of corrosion resistance of the produced hybrid composites, the EIS and potentiodynamic polarization tests were carried out on ARBed 1050 Al alloy (which was used as matrix) after 3 and 9 cycles. The results of EIS and potentiodynamic polarization curves revealed that employing the ARB process has led to higher polarization resistance and lower corrosion current density of the produced hybrid composites as well as 1050 Al alloy.

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