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Materials 2015, 8(9), 6455-6470; doi:10.3390/ma8095314

Electrochemical Behavior of Al-B4C Metal Matrix Composites in NaCl Solution

Department of Applied Sciences, Université du Québec à Chicoutimi, 555 boul. de l’Université, Saguenay, QC G7H 2B1, Canada
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Academic Editor: J. Paulo Davim
Received: 21 August 2015 / Revised: 13 September 2015 / Accepted: 15 September 2015 / Published: 21 September 2015
(This article belongs to the Section Advanced Composites)
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Abstract

Aluminum based metal matrix composites (MMCs) have received considerable attention in the automotive, aerospace and nuclear industries. One of the main challenges using Al-based MMCs is the influence of the reinforcement particles on the corrosion resistance. In the present study, the corrosion behavior of Al-B4C MMCs in a 3.5 wt.% NaCl solution were investigated using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques. Results indicated that the corrosion resistance of the composites decreased when increasing the B4C volume fraction. Al-B4C composite was susceptible to pitting corrosion and two types of pits were observed on the composite surface. The corrosion mechanism of the composite in the NaCl solution was primarily controlled by oxygen diffusion in the solution. In addition, the galvanic couples that formed between Al matrix and B4C particles could also be responsible for the lower corrosion resistance of the composites. View Full-Text
Keywords: Al-B4C metal matrix composite; pitting; galvanic corrosion; oxygen diffusion Al-B4C metal matrix composite; pitting; galvanic corrosion; oxygen diffusion
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Han, Y.-M.; Chen, X.-G. Electrochemical Behavior of Al-B4C Metal Matrix Composites in NaCl Solution. Materials 2015, 8, 6455-6470.

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