Details

Autor(en) / Beteiligte

• Kumar, Neeraj
• Sharma, Ashutosh
• Manoj, Manoranjan Kumar

Titel

Influence of Different Aqueous Media on the Corrosion Behavior of B[sub.4]C-Modified Lightweight Al-Mg-Si Matrix Composites

Ist Teil von

• Materials, 2022-11, Vol.15 (23)

Ort / Verlag

MDPI AG

Erscheinungsjahr

2022

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• In this study, we have investigated the electrochemical corrosion behavior of boron carbide (B[sub.4]C) ceramic-reinforced Al-Mg-Si matrix composites in various aqueous environments (NaOH, NaCl, HCl, and H[sub.2]SO[sub.4]). 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[sub.ct]) resistance, and lower double-layer capacitance (C[sub.dl]) as compared to other media. The SEM morphology suggests that B[sub.4]C ceramics enhance corrosion resistance by forming a protective barrier layer of OH- and Cl- deposits in the composite and unreinforced alloy, respectively.