Corrosion Behavior of Alumina-Aluminum and Silicon Carbide-Aluminum Metal-Matrix Composites

P.C.R. Nunes; L. V. Ramanathan

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Corrosion Behavior of Alumina-Aluminum and Silicon Carbide-Aluminum Metal-Matrix Composites

机译：Corrosion Behavior of Alumina-Aluminum and Silicon Carbide-Aluminum Metal-Matrix Composites

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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 (Ej) was lowered from ~ 500 m VSCB in deaerated NaCl to 100 m VSCE in aerated NaCl. Particle addition affected Ep but not ECOTT. 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 (Al_2O_3) 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 (CeO_2) coatings improved corrosion resistance of the composites.

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来源
《Corrosion: The Journal of Science and Engineering》 |1995年第8期|610-617|共8页
作者
P.C.R. Nunes; L. V. Ramanathan;
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作者单位

Comissao Nacional de Energia Nuclear, Instituto de Pesquisas Energeticas e Nudeares, C.P. 11049, Cidade Universitaria, Sao Paulo, 05422-970, Brazil.;

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正文语种英语
中图分类金属腐蚀与保护、金属表面处理;
关键词
alumina; aluminum; aqueous corrosion; corrosion resistance; metal-matrix composites; particle reinforcements; phases; pitting; silicon carbide;

Corrosion Behavior of Alumina-Aluminum and Silicon Carbide-Aluminum Metal-Matrix Composites

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