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Sādhanā

, 44:229 | Cite as

Studies on electro-chemical corrosion of carbon fiber reinforced aluminium alloy AA7075

  • Madhuri DeshpandeEmail author
  • S T Vagge
  • S V S Narayan Murty
  • Harishwar Kale
  • Ramesh Gondil
Article
  • 18 Downloads

Abstract

Carbon fiber reinforced AA7075 is known for good thermal properties and thus used as heat dissipating material. However, few such applications involve corrosive environments too, and hence there is a need to study the behavior of these composite materials under corrosive environment. In the present work, milled carbon fiber reinforced AA7075 composites were produced by vacuum hot pressing with varying amounts of milled carbon fibers. The relative densities of the composites were measured. SEM-EDS, TEM and XRD techniques were also employed for characterization. The composites were then characterized for electro-chemical behavior in 3.5 wt.% aqueous NaCl solution by electrochemical polarization technique. Results showed that the corrosion potentials Ecorr have shifted to more negative direction and thus showed increase in corrosion current density, leading to increase in corrosion rate with increasing vol.% of carbon fibers. These results were complemented by SEM micrographs of the composites after corrosion test, which revealed that corrosion occurred at the interface of carbon fiber and matrix due to formation of galvanic coupling between carbon fiber and matrix. Thus, reduced corrosion resistance in composites as amount of fibers increases, is attributed to increase in number of galvanic cells that form at the interface.

Keywords

Carbon fibers AA7075 alloy metal matrix composites corrosion SEM/EDS 

References

  1. 1.
    Silvain S J F, Veillere A and Lu Y 2014 Copper-carbon and aluminium-carbon composites fabricated by powder metallurgy. J. Phys. Confer. Ser. 525: 12–15Google Scholar
  2. 2.
    Chen J K and Huang I S 2013 Thermal properties of aluminum–graphite composites by powder metallurgy. Compos. Part B 44: 698–703CrossRefGoogle Scholar
  3. 3.
    Winkler S L and Flower H M 2014 Stress corrosion cracking of cast 7XXX aluminium fiber reinforced composites. Corros. Sci. 46: 903–915CrossRefGoogle Scholar
  4. 4.
    Bakkar A and Ataya S 2014 Corrosion behavior of stainless steel fiber-reinforced copper metal matrix composite with reference to electrochemical response of its constituents. Corros. Sci. 85: 343–351CrossRefGoogle Scholar
  5. 5.
    Mathan Kumar N, Kumaran S S and Kumaraswamidhas L A 2015 An investigation of mechanical properties and corrosion resistance of Al2618 alloy reinforced with Si3N4, AlN and ZrB2 composites. J. Alloys Compd. 652: 244–249CrossRefGoogle Scholar
  6. 6.
    Verma A S, Sumankant, Suri N M and Yashpal 2015 Corrosion behavior of aluminum base particulate metal matrix composites: a review. Mater. Today Proc. 2: 2840–2851Google Scholar
  7. 7.
    Naji H, Zebarjad S M and Sajjadi S A 2008 The effects of volume percent and aspect ratio of carbon fiber on fracture toughness of reinforced aluminum matrix composites. Mater. Sci. Eng. 486(1–2): 413–419CrossRefGoogle Scholar
  8. 8.
    Sánchez M, Rams J and Ureña A 2010 Fabrication of aluminium composites reinforced with carbon fibers by a centrifugal infiltration process. Compos. Part A 41: 1605–1611CrossRefGoogle Scholar
  9. 9.
    Bhav Singh B and Balasubramanian M 2009 Processing and properties of copper-coated carbon fiber reinforced aluminium alloy composites. J. Mater. Process. Technol. 209: 2104–2110CrossRefGoogle Scholar
  10. 10.
    Lee M, Choi Y, Sugio K, Matsugi K and Sasaki G 2014 Effect of aluminium carbide on thermal conductivity of the unidirectional CF/Al composites fabricated by low pressure infiltration process. Compos. Sci. Technol. 97: 1–5CrossRefGoogle Scholar
  11. 11.
    Wielage B and Dornar A 1999 Corrosion studies on aluminium reinforced with uncoated and coated carbon fibers. Compos. Sci. Technol. 59: 1239–1245CrossRefGoogle Scholar
  12. 12.
    Bhagat R B, Amateau M F, Paulik J M., Chrisholm J M, Parnell J M, Seidensticker D G 1988 In: Fishman S G and Dhingra A K (eds) Cast reinforced metal composites. USA: ASM Inter-national, pp. 185–194Google Scholar
  13. 13.
    Simancik E, Jangg G and Degischer H 1993 Short carbon fiber-aluminum matrix composite material prepared by extrusion of powder mixtures. Journal De Physique IV Colloque 3(C7): C7-1775–C7-1780Google Scholar
  14. 14.
    Deshpande M, Gondil R, Narayan Murty S V S and Kalal R K 2017 Studies on 7075 aluminium alloy MMCs with milled carbon fibers as reinforcements. Trans. Indian Inst. Metals 71(4): 993–1002CrossRefGoogle Scholar
  15. 15.
    Hihara L H and Bakkar A 2016 Corrosion of metal matrix composites. In: Reference Module in Materials Science and Materials Engineering pp. 1–28Google Scholar

Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • Madhuri Deshpande
    • 1
    Email author
  • S T Vagge
    • 2
  • S V S Narayan Murty
    • 3
  • Harishwar Kale
    • 1
  • Ramesh Gondil
    • 1
  1. 1.Production Engineering DepartmentVishwakarma Institute of TechnologyPuneIndia
  2. 2.Department of Metallurgy and Materials ScienceCollege of Engineering PuneShivaji Nagar, PuneIndia
  3. 3.Material CharacterizationVikram Sarabhai Space CenterThiruvananthpuramIndia

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