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Journal of Materials Science

, Volume 27, Issue 14, pp 3897–3902 | Cite as

Corrosion behaviour of squeeze-cast aluminium alloy-silicon carbide composites

  • O. P. Modi
  • Mohini Saxena
  • B. K. Prasad
  • A. H. Yegneswaran
  • M. L. Vaidya
Papers

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.

Keywords

Corrosion Rate Corrosion Behaviour Base Alloy Potentiodynamic Polarization Corrosion Test 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Chapman & Hall 1992

Authors and Affiliations

  • O. P. Modi
    • 1
  • Mohini Saxena
    • 1
  • B. K. Prasad
    • 1
  • A. H. Yegneswaran
    • 1
  • M. L. Vaidya
    • 2
  1. 1.Regional Research Laboratory (CSIR)Bhopal 462 026 (MP)India
  2. 2.Department of Metallurgical EngineeringIndian Institute of TechnologyKanpur 208016 (UP)India

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