期刊
MATERIALS
卷 15, 期 23, 页码 -出版社
MDPI
DOI: 10.3390/ma15238531
关键词
corrosion; powder metallurgy; metal matrix composite (MMC); ceramics; aluminum alloys
This study investigates the corrosion behavior of boron carbide reinforced Al-Mg-Si matrix composites in different aqueous environments. The results show that the composites exhibit the highest corrosion resistance in NaCl medium, and a protective barrier layer is formed.
In this study, we have investigated the electrochemical corrosion behavior of boron carbide (B4C) ceramic-reinforced Al-Mg-Si matrix composites in various aqueous environments (NaOH, NaCl, HCl, and H2SO4). The samples were produced by the powder metallurgy (P/M) route and the corrosion investigations were conducted by potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) methods. The morphology of the as-prepared and corroded samples was examined by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) studies. The investigations revealed that the corrosion resistance of Al-Mg-Si composites is highest in NaCl medium due to a less negative corrosion potential, higher charge transfer (R-ct) resistance, and lower double-layer capacitance (C-dl) as compared to other media. The SEM morphology suggests that B4C ceramics enhance corrosion resistance by forming a protective barrier layer of OH- and Cl- deposits in the composite and unreinforced alloy, respectively.
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