Journal of Applied Electrochemistry

, Volume 40, Issue 4, pp 777–782 | Cite as

Influence of cobalt on manganese incorporation in Ni–Co coatings

  • Meenu Srivastava
  • V. K. William Grips
  • K. S. Rajam
Original Paper


The effect of alloying <1 wt% Mn with plain Ni, Ni–Co alloys and plain Co coatings in terms of the structure and properties has been studied. The alloys were electrodeposited from an additive free sulphamate electrolyte. The Mn concentration in the electrolyte was maintained at 5 g L−1 so as to obtain <1 wt% Mn content in the alloy coatings. The Energy Dispersive X-ray analysis (EDX) showed that the Mn content reduced from 0.97 to 0.05 wt% with increase in Co content from 0 to 98 wt% in the alloy coating. An increase in microhardness was obtained on the addition of Mn to Ni/Ni–Co alloys. The X-ray diffraction (XRD) and Scanning Electron Microscopy (SEM) studies revealed a change in crystal structure and morphology. Pin-on-disc tribology test revealed better wear performance of Ni–18 wt%Co–Mn alloy coating compared to the other Ni–Mn/Ni–Co–Mn alloy coatings.


Ni–Co–Mn alloy Ni–Co alloy Microstructure Mechanical properties 



The authors wish to thank Dr. A. R. Upadhya, Director, NAL for permitting to publish the work. The authors are also thankful to Dr. Anjana Jain for the XRD studies and Mr. Raghavendra for the SEM/EDX analysis.


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Copyright information

© Springer Science+Business Media B.V. 2009

Authors and Affiliations

  • Meenu Srivastava
    • 1
  • V. K. William Grips
    • 1
  • K. S. Rajam
    • 1
  1. 1.Surface Engineering DivisionNational Aerospace Laboratories (CSIR)BangaloreIndia

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