Abstract
The corrosion behaviour of squeeze-cast Al alloy (LM11) separately dispersed with 10 vol% SiC fibres and SiC particles was investigated in 3% aqueous NaCl solution by general corrosion as well as potentiodynamic polarization techniques. Erosion-corrosion tests were also performed on the specimens in the solution. The base alloy was also subjected to identical tests to examine the influence of the presence of SiC in the matrix. The base alloy showed a lower corrosion rate than the composites. Furthermore, the alloy containing SiC fibres showed a higher corrosion rate than the one with SiC particle dispersion. Erosioncorrosion tests indicated that the rate of material loss followed a trend similar to that in other corrosion tests. The material loss was significantly higher in the case of erosion-corrosion tests. In addition to pitting and attack at the CuAl2 precipitate-Al interface in the matrix, dispersoid-matrix interfacial attack by the corrosion medium was also observed in the case of composites. On the other hand, erosion-corrosion revealed occasional partial removal of the dispersoid due to the impingement of the electrolyte. The tendency of the dispersoid removal by the impinging electrolyte was predominantly more in the case of the composites dispersed with SiC fibres. Results are explained in terms of the interfacial bonding as well as the shape of the dispersoid.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
I. F. Richardson, Foundrymen 82 (1989) 538.
K. J. Bhansali and R. Mehrabian, J. Metals 32 (1982) 30.
F. Rana and D. M. Stefanescu, Met. Trans. A20 (1989) 1564.
A. T. Alpas and J. D. Embury, Scripta Metall. 24 (1990) 931.
D. M. Aylor and P. J. Moran, J. Electrochem. Soc. 132 (1985) 1271.
D. M. Aylor, in “Metals handbook”, 9th Edn, Vol. 13 (American Society for Metals International, Metals Park, Ohio, 1987) p. 859.
E. McCafferty and P. P. Trzaskoma, in Extended Abstracts of the Electrochemical Society, Denver, Colorado, Meeting, October 1981 (Electrochemical Society, Pennington, New Jersey, 1981) Abstr. 152.
D. M. Aylor and R. M. Kain, “Recent advances in composites in the United States and Japan”, ASTM STP 684, edited by J. R. Vinson and M. Taya (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1985) p. 632.
J. Zahavi and H. J. Wagner, in Proceedings of the Symposium on the Corrosion-Erosion Behaviour of Materials, edited by K. Natesan, Fall Meeting of the Metals Society of AIME, St Louis, Missouri, 17–18 October 1978 (American Institute of Mining, Metallurgical and Petroleum Engineers, Warrendale, Pennsylvania, 1978) p. 226.
A. A. Das, M. Yacoub, B. Zantout and A. J. Clegg, Cast Met. 1 (1988) 69.
B. Vyas, in “Erosion-Corrosion Treatise on Materials Science and Technology”, Vol. 16: “Erosion”, edited by C. M. Preece (Academic Press, New York, 1979) p. 364.
H. H. Strehblow, in International Congress on Metallic Corrosion, June 1984 (National Research Council, Canada, 1984) p. 99.
C. Edeleanu and U. R. Evans, Trans. Faraday Soc. 47 (1951) 1121.
B. Vyas and C. M. Preece, in “Erosion, wear and interfaces with corrosion”, ASTM STP 567 (American Society for Testing and Materials, Philadelphia, Pennsylvania, 1974) p. 77.
J. W. Tichler, J. Lubr. Technol. Trans. Amer. Soc. Mech. Engs 92 (1970) 220.
M. Metzger and S. G. Fishman, Indust. Eng. Chem. Prod. Res. Dev. 22 (1983) 294.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Modi, O.P., Saxena, M., Prasad, B.K. et al. Corrosion behaviour of squeeze-cast aluminium alloy-silicon carbide composites. J Mater Sci 27, 3897–3902 (1992). https://doi.org/10.1007/BF00545474
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF00545474