Advertisement

Journal of Materials Science

, Volume 26, Issue 18, pp 4991–4996 | Cite as

Corrosion behaviour of silicon carbide particle reinforced 6061/Al alloy composites

  • M. S. N. Bhat
  • M. K. Surappa
  • H. V. Sudhaker Nayak
Papers

Abstract

The corrosion behaviour of 6061 Al alloy-SiCp composites (in as cast and extruded form) have been studied in sea water and acid media. The effects of temperature of both the media and concentration of the acid medium were also investigated. The corrosion behaviour was evaluated using electrochemical technique and corroded specimens were examined using scanning electron microscopy. The studies revealed that corrosion damage of composites exposed to sea water medium was mainly localized in contrast to uniform corrosion observed for base alloy. Further, composites were found to corrode faster than the base alloy even though the attack was mainly confined to the interface, resulting in crevices or pits. This could be attributed to the presence of thin layer of reaction product present at the interface acting as an effective cathode which when continuous would increase the cathode to anode ratio enabling higher localized corrosion. However, the extent of corrosion damage in extruded composites was less possibly due to absence of defects like gas pores in the composites and homogeneity in the distribution of particles. Increase in temperature invariably increased the attack for all the materials studied. This is explained due to the metal dissolution (anodic process) which is governed by the kinetics at that temperature.

Keywords

Carbide Acid Medium Corrosion Behaviour Base Alloy Carbide Particle 
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.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    D. M. Aylor, “Metals Handbook”, 9th edition, vol. 13, (American Society for Metals, OH 1987), p 859.Google Scholar
  2. 2.
    P. K. Rohatgi, R. Astana and S. Das, Int. Met. Rev 31 (1986) 115.Google Scholar
  3. 3.
    A. M. Patton, J. Inst. Metals 100 (1972) 197.Google Scholar
  4. 4.
    M. Saxena, O. P. Mody, A. H. Yagneshwaran and P. K. Rohatgi Corros. Sci. 27 (1987) 249.Google Scholar
  5. 5.
    S. Z. Pholman, Corrosion 34 (1978) 156.Google Scholar
  6. 6.
    A. J. Sedriks, J. A. S. Green and D. L. Novak, Met. Trans. 2 (1971) 871.Google Scholar
  7. 7.
    S. V. Nair, J. K. Tien and R. C. Bates, Int. Met. Rev. 30 (1985) 275.Google Scholar
  8. 8.
    Deonath and T. K. G. Namboodhiri, Corros. Sci. 29 (1989) 1215.Google Scholar
  9. 9.
    P. P. Trazakoma, E. M. McCaferty and C. R. Crowe, J. Electrochem. Soc. 130 (1983) 1804.Google Scholar
  10. 10.
    M. K. Surappa and P. K. Rohatgi, J. Mater. Sci. 16 (1981) 983.Google Scholar
  11. 11.
    M. Metzger and S. G. Fishmann, Ind. Engng. Chem. Prod. Res. Dev. 22 (1983) 296.Google Scholar
  12. 12.
    W. H. Aylor (Ed.), “Handbook on Corrosion Testing and Evaluation” (Wiley & Sons, New York 1971) p. 192.Google Scholar
  13. 13.
    D. J. Lloyd and I. Jin, Met. Trans 19A (1988) 3107.Google Scholar

Copyright information

© Chapman & Hall 1991

Authors and Affiliations

  • M. S. N. Bhat
    • 1
  • M. K. Surappa
    • 1
  • H. V. Sudhaker Nayak
    • 2
  1. 1.Department of MetallurgyIndian Institute of ScienceBangaloreIndia
  2. 2.Department of Metallurgical EngineeringKarnataka Regional Engineering CollegeSurathkalIndia

Personalised recommendations