Ultramicrotomy—a route towards the enhanced understanding of the corrosion and filming behaviour of aluminium and its alloys

Shimizu, K.; Brown, G.M.; Kobayashi, K.; Skeldon, P.; Thompson, G.E.; Wood, G. C.

doi:10.1016/s0010-938x(98)00006-7

Cited by 71 publications

(40 citation statements)

References 14 publications

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“…Further analysis of the internal PS structure was carried out using TEM analysis of ultramicrotomed sections for morphological analysis [23][24]. BF-TEM analysis was carried out on numerous particles in samples 2E-100 and 2E-60 sectioned using an ultramicrotome with representative images shown in Fig.…”

Section: Ps Pore Characterization -Tem Ultramicrotomymentioning

confidence: 99%

Microstructural characterisation of metallurgical grade porous silicon nanosponge particles

2011

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Porous silicon finds numerous applications in the areas of bio-technology, drug delivery, energetic materials and catalysis. Recent studies by Vesta Sciences have led to the development of porous silicon nanosponge particles from metallurgical grade silicon powder through their own patented chemical etching process (Irish patent no. IE20060360). This discovery paves the way for a more economical production method for porous silicon. The work presented here studies the structural morphology of the porous silicon nanosponge particles using high resolution electron microscopy techniques combined with porisometry type measurements where appropriate. The related surface pore structure is examined in detail using Scanning Electron Microscopy and Transmission Electron Microscopy techniques while the internal pore structure is explored using Focused Ion Beam milling and ultramicrotomed cross-sections. Three samples of the silicon particles were analysed for this study which include the starting metallurgical grade silicon powder and two samples that have been chemically etched. Analysis of the etched samples indicates a disordered pore structure with pore diameters ranging up to 15nm on porous silicon particles ranging up to 5µm in size. Crystallographic orientation did not appear to affect the surface pore opening diameter. Internal pore data indicated pore depths of up to 1 µm dependant on the particle size and etching conditions applied.

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Section: Ps Pore Characterization -Tem Ultramicrotomymentioning

confidence: 99%

Microstructural characterisation of metallurgical grade porous silicon nanosponge particles

2011

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“…Die Oxidationsfront innerhalb der Ausscheidung eilt der Matrix voran. Dies wurde bereits in [8] festgestellt und auf unterschiedliche Umwandlungsraten für die Ausscheidungen und die Matrix während des Anodisierens zurück geführt.…”

Section: Einschraubverhalten Der Oberflächenveredelten Schraubenunclassified

Anodizing of aluminium screws through direct and liquid contacting – a technology comparison

Brendler¹,

Scharf²,

Härtel³

et al. 2011

Materialwissenschaft Werkst

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Die Umsetzung der Mischbauweise in der Automobilindustrie und in der Luft-und Raumfahrt stellt das Fügen mittels Schraube vor neue Problemstellungen. Anodisierte hochfeste Aluminiumschrauben sollen gewindefurchende Stahlschrauben ersetzen und die Schädigung der Werkstoffverbunde durch elektrochemische Korrosion verhindern. Untersucht wurden die Korrosions-und Verschleißbeständigkeit sowie das Einschraubverhalten anodisierter Aluminiumschrauben bezüglich der gewählten Verfahrensvarianten Direkt-bzw. Flüssigkontaktierung. Die hartanodisieren Schrauben sind korrosions-und verschleißbeständig und eignen sich für die Direktverschraubung. Die Ergebnisse zeigen, dass durch eine gezielte Oberflächenveredelung der Anwendungsbereich von anodisierten Aluminiumschrauben deutlich erweitert werden kann.Schlüsselwörter: Aluminium / Anodisieren / Flüssigkontaktprinzip / Schrauben / Gewindefurchen / The realization of hybrid constructions in the automotive and aerospace industry is posing new challenges to screw joints. Anodized high-strength aluminium screws are intended to replace thread-forming steel screws and prevent the corrosion of material compounds. The corrosion and wear resistance as well as the screw-in behaviour of anodized aluminium screws with respect to the selected processes of direct or liquid contacting has been studied. The hard anodized screws are corrosion-and wear resistant and suitable for direct assembly. The results indicate that specific surface treatment can extend the scope of application of anodized aluminium screws considerably.

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“…Outros elementos, como por exemplo, ferro e silício, presentes na solidificação do metal liquido formam soluções sólidas, ou seja, estão distribuídos de maneira uniforme dentro da matriz, mas também podem estar segregadas nos contornos de grão (BROWN et al, 1992;SHIMIZU et al,1998).…”

Section: Impurezas No Metal Líquidounclassified

“…Através de estudos em que a propriedade de resistência à corrosão das películas passivas de óxido-hidróxido de alumínio foi investigada, Shimizu et al (1998), afirmam que um elemento-chave no processo de corrosão está na natureza heterogênea microscópica da superfície do alumínio.…”

Section: Passividade Do Alumíniounclassified

“…Estes precipitados apresentam diferentes tamanhos, morfologias e distribuição, prejudicando as propriedades protetoras da matriz. Isso ocorre principalmente quando se apresentam com tamanho grosseiro, morfologia alongada e concentrados nos contornos de grão (BROWN et al, 1993;SHIMIZU et al,1998). Além disso, quando os precipitados estão presentes na superfície, o filme óxido de alumínio que protege o material contra a corrosão não se faz presente nessas regiões ou então é extremamente fino (HATCH, 1984).…”

Section: Influência Dos Elementos De Liga Na Corrosão Do Alumínio E Sunclassified

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Correlação entre microestrutura e comportamento de corrosão em duas ligas do sistema Al-Fe-Si produzidas pelos processos industriais de lingotamento contínuo e semi-contínuo.

Yoshikawa¹

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Ultramicrotomy—a route towards the enhanced understanding of the corrosion and filming behaviour of aluminium and its alloys

Cited by 71 publications

References 14 publications

Microstructural characterisation of metallurgical grade porous silicon nanosponge particles

Microstructural characterisation of metallurgical grade porous silicon nanosponge particles

Anodizing of aluminium screws through direct and liquid contacting – a technology comparison

Correlação entre microestrutura e comportamento de corrosão em duas ligas do sistema Al-Fe-Si produzidas pelos processos industriais de lingotamento contínuo e semi-contínuo.

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