Abstract
The oxidation behavior of small amounts of Al–7Si alloys containing strontium and magnesium has been investigated using thermal gravimetrical analysis (TGA). The results of TGA experiments showed that Sr-additions increase the oxidation rate of the Al–7Si alloys melt significantly. A noticeable content of SrO-containing mixed oxides was found, using scanning electron microscopy (SEM), on the oxidized surfaces after even short oxidation periods. The rapid rate of Sr-loss during the oxidation periods also showed that Sr was highly reactive in the small melts for oxidation. The oxidation of large Al–7Si melts was also studied by analyzing the surface layer at different periods. The surface oxide layers on the large melts consisted of Al2O3 and Al2O3 · MgO but were found to contain no detectable SrO. Also, in contrast with the small melts, the relatively slow rate of Sr-loss during the oxidation period showed that strontium has good stability in a large melt, revealing that in such cases the tendency of Sr for oxidation is not noticeable.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
J. E. Gruzleski and B. M. Closset, The Treatment of Liquid Aluminium–Silicon Alloys (AFS, Des Olaines, IL, 1990).
J. Campbell, Casting (Principles), 2nd edn. (Butterworth-Heinemann, Oxford, UK, 2003).
S. M. Miresmaeili, J. Campbell, S. G. Shabestari, and S. M. A. Boutorabi, Journal of Metallurgical and Materials Transaction A 53, 342 (2005).
S. M. Miresmaeili, S. G. Shabestari, and S. M. A. Boutorabi, International Journal of Cast Metals Research 16, 541 (2003).
S. M. Miresmaeili, Metal 2005, Hradec nad Moravici, Czech Republic, 24–26th May, 2005, session E.P. 223–231.
S. M. Miresmaeili, S. G. Shabestari, and S. M. A. Boutorabi, Canadian Metallurgical Quarterly 42, 245 (2003).
S. G. Shabestari, S. M. Miresmaeili, and S. M. A. Boutorabi, Journal of Materials Science 38, 1901 (2003).
J. E. Gruzleski, AFS Transactions 164, 673 (1992).
L. Liu, A. M. Samuel, F. H. Samuel, H. W. Doty, and S. Valtierra, Journal of Material Science 38, 1255 (2003).
J. Anson, J. E. Gruzleski, and M. Stucky, AFS Transactions 108, 243 (2001).
J. Anson, M. Stucky, and J. E. Gruzleski, AFS Transactions 108, 419 (2000).
M. Garat, G. Laslaz, and S. Jacob, AFS Transactions 100, 821 (1992).
D. Emadi and J. E. Gruzleski, AFS Transactions 104, 763 (1996).
P. Yuen, R. Drew, J. E. Gruzleski, and K. Dennis, in 6th International AFS Conference (Molten Aluminum Processing, Orlando, FL, USA, 2001).
S. Impey, D. J. Stephenson, and J. R. Nicholls, Microscopy of Oxidation 2, 323 (1993).
Inca Energy, Training Notes for Energy (Oxford Instruments Analytical, 2000).
J. Goldstein, D. E. Newbury, and P. Echlin, Scanning Electron Microscopy and X-ray Microanalysis, a Text for Biologists, 2nd edn. (Plenum Press, New York, 1992).
O. Kubaschewski and C. B. Alcock, Metallurgical Thermochemistry, International Series on Materials Science and Technology, Vol. 24 (Pergamon Press, London, 1979).
N. B. Pilling and R. E. Bedworth, Journal Institute of Metals 29, 529 (1923).
Metals Handbook, Vol. 15, Casting (American Society for Metals, 1988).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Miresmaeili, S.M. Effect of Strontium on the Oxidation Behavior of Liquid Al–7Si Alloys. Oxid Met 71, 107–123 (2009). https://doi.org/10.1007/s11085-009-9136-3
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11085-009-9136-3