Corrosion behavior of alumina-aluminum and silicon carbide-aluminum metal-matrix composites
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1995
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Corrosion
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Resumo
Particle-reinforced, aluminum-based metal-matrix composites
(MMCs) are being considered for a range of applications.
Their mechanical properties have been investigated in detail,
but more information about their corrosion behavior is
needed. The influences of alloy composition; particle characteristics
such as composition, size, volume fraction, and
pretreatment; and composite post-treatment on the aqueous
corrosion behavior of aluminum-matrix composites prepared
by the melt stirring process were studied. Corrosion tests
consisted of prolonged immersion and anodic polarization
measurements in sodium chloride (NaCl) solutions. The difference
between the corrosion potential (Ecorr) and the pitting
potential (Ep) was lowered from ~ 500 mVSCE in deaerated
NaCl to 100 mVSCE in aerated NaCl. Particle addition affected
Ep but not Ecorr. Immersion test data revealed significant
specimen weight loss for the composites resulting from formation
of pits or microcrevices in the matrix near the
particle-matrix interface and from particle dropout. Pits in the
silicon carbide (SiC) composites were deeper than those in
the alumina (Al2O3) composites, probably because the SiC
particles acted as efficient cathodic sites. Pit initiation and
propagation occurred at weak spots in the air-formed film,
corresponding to phase discontinuities and second-phase
particles and to oxygen reduction at the particles or precipitates.
Anodization and ceria (CeO2) coatings improved
corrosion resistance of the composites.
Como referenciar
NUNES, P.C.R.; RAMANATHAN, L.V. Corrosion behavior of alumina-aluminum and silicon carbide-aluminum metal-matrix composites. Corrosion, v. 51, n. 8, p. 610-617, 1995. Disponível em: http://repositorio.ipen.br/handle/123456789/26723. Acesso em: 13 May 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.