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Surface Segregation of Indium by Heat Treatment of Aluminium

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Abstract:

High temperature heat treatment of aluminium alloys causes surface enrichment of the trace elements in Group IIIA - VA, specifically the low melting point elements Pb, Bi, In and Sn. The phenomenon has practical significance in promoting certain types of localised corrosion, such as galvanic and filiform corrosion, while mitigating other types, such as pitting corrosion of the bare surface. The purpose of this paper is to investigate the surface enrichment and microstructure of indium relative to the available data for Pb. Model binary AlIn alloys, containing 20-1000 ppm of In, were used after heat treatment at various temperatures. In addition to electrochemical investigations, the microstructures were characterised by field emission scanning electron microscopy (FEG SEM) and field emission transmission electron microscopy (FEG TEM). Heat treatment at temperatures as low as 300°C gave significant segregation of In as opposed to 600°C for Pb. As a result of this and yet unresolved oxide film breakdown mechanism on aluminium, In was significantly more effective than Pb in anodically activating aluminium. These results suggest the possibility that significant activation earlier observed on certain commercial alloys as a result of low temperature heat treatment may be due to the trace elements In.

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Periodical:

Materials Science Forum (Volumes 519-521)

Pages:

673-678

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.519-521.673

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Online since:

July 2006

Authors:

Brit Graver, Antonius T.J. van Helvoort, John Charles Walmsley, Kemal Nisancioglu

Keywords:

Depth Profiling, Microstructure, Segregation, Trace Elements

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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References

[1] Y. W. Keuong, S. Nordlien and K. Nisancioglu, J Electrochem. Soc. 150 (2003) B547.

DOI: 10.1149/1.1615996

Google Scholar

[2] J. T. B. Gundersen, A. Aytac, S. Ono, J. H. Nordlien and K. Nisancioglu, Corros. Sci. 46 (2004) 265.

Google Scholar

[3] W. M. Carroll and C. B. Breslin, Corros. Sci. 33(1992) 1161.

Google Scholar

[4] J. B. Bessone, D. O. Flamini and S. B. Saidman, Corros. Sci. 47 (2005) 95.

Google Scholar

[5] K. Fukuoka, Sumitomo Light Metal Technical Reports 42 (2001) 131.

Google Scholar

[6] K. Nisancioglu and H. Holtan Corros. Sci. 18 (1978) 835.

Google Scholar

[7] Sridhar K. Kailasam, S. P. Murarka, M. E. Glicksman, J Electrochem. Soc. (2000).

Google Scholar

[8] M. L. Swanson, Th. Wickert, L. M. Howe and A. F. Quenneville, Nuclear Instruments and Methods in Physics Research 413 (1986) B15.

Google Scholar

[9] L. F. Mondolfo, Aluminium Alloys: Structure and Properties, p.304, Butterworths, London (1976).

Google Scholar

[10] H. Gabrisch, U. Dahmen and E. Johnson, Microsc. Microanal., 4 (1998) 286.

Google Scholar