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Effect of TiN particulate reinforcement on corrosive behaviour of aluminium 6061 composites in chloride medium

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Abstract

In the present investigation, the corrosive behaviour of Al 6061–TiN particulate composites prepared by liquid metallurgy has been studied in chloride medium using electroanalytical techniques such as Tafel, cyclic polarization and electrochemical impedance spectroscopy (EIS). Surface morphology of the sample electrodes was examined using scanning electron micrography and energy dispersive X-ray methods. X-ray diffraction technique was used to confirm inclusion of TiN particulates in the matrix alloy and identify the alloying elements and intermetallic compounds in the Al 6061 composites. Polarization studies indicate an increase in the corrosion resistance in composites compared to the matrix alloy. EIS study reveals that the polarization resistance (R p) increases with increase in TiN content in composites, thus confirming improved corrosion resistance in composites. The observed decrease in corrosion rate in the case of composites is due to decoupling between TiN particles and Al 6061 alloy. It is understood that after the initiation of corrosion, interfacial corrosion products may have decoupled the conducting ceramic TiN from Al 6061 matrix alloy thus eliminating the galvanic effect between them.

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Acknowledgements

The authors are grateful to the Principal Dr M K Venkatesha, the Director Dr H N Shivashankar and the management of RNS Institute of Technology, Bangalore and the Principal and Management of Dr Ambedkar Institute of Technology, for their support and encouragement towards our research.

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Authors and Affiliations

  1. Department of Chemistry, R N Shetty Institute of Technology, Rajarajeshwari Nagar, Bangalore, 560 098, India

    H C ANANDA MURTHY

  2. Department of Chemistry, Dr. Ambedkar Institute of Technology, Bangalore, 560 056, India

    V BHEEMA RAJU

  3. Solid State and Structural Chemistry Unit, Indian Institute of Science, Bangalore, 560 012, India

    C SHIVAKUMARA

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  1. H C ANANDA MURTHY
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Correspondence to H C ANANDA MURTHY.

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MURTHY, H.C.A., RAJU, V.B. & SHIVAKUMARA, C. Effect of TiN particulate reinforcement on corrosive behaviour of aluminium 6061 composites in chloride medium. Bull Mater Sci 36, 1057–1066 (2013). https://doi.org/10.1007/s12034-013-0560-2

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  • DOI: https://doi.org/10.1007/s12034-013-0560-2

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