Investigation on corrosion behavior of the Al-B4C metal matrix composite in a mildly oxidizing aqueous environment

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DOIResolve DOI: http://doi.org/10.5006/1.3659505
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TypeArticle
Journal titleCorrosion
ISSN0010-9312
Volume67
Issue11
Article number115005
SubjectElectrochemical impedance; Galvanic coupling; Metal matrix composites; Potentiodynamics; Sulfate solutions; Aluminum; Boron; Boron carbide; Chlorine compounds; Corrosion; Corrosive effects; Electrochemical corrosion; Electrochemical impedance spectroscopy; Pitting; Polarization; Potentiodynamic polarization; Scanning electron microscopy; X ray photoelectron spectroscopy; Metallic matrix composites
AbstractThe corrosion behavior of Al-B4C (aluminum-boron carbide) metal matrix composites in a 0.5 M potassium sulfate (K2SO4) solution was investigated using electrochemical impedance spectroscopy and potentiodynamic polarization methods. Optical and scanning electron microscopes as well as profilometry were used to study the surface morphology of the material before and after corrosion. Moreover, infrared reflectionabsorption spectroscopy (IRRAS) and x-ray photoelectron spectroscopy (XPS) were used to identify the corrosion products. It was observed that SO4 2- species did not induce pitting of the AA1100 (UNS A91100)-16 vol% B4C. In contrast, it was found that the Al-B4C composite was highly susceptible to pitting attacks by chloride ions, especially at the Al/B4C interfaces. The B4C particles showed a cathodic character with respect to the peripheral matrix, and both the IRRAS and XPS results showed that bayerite (Al[OH]3) was the main corrosion product. © 2011, NACE International.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC)
Peer reviewedYes
NPARC number21271648
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Record identifier09def841-2549-4195-abb4-eeea9b2eaedc
Record created2014-03-24
Record modified2016-05-09
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