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Journal of Applied Electrochemistry

, Volume 34, Issue 11, pp 1085–1091 | Cite as

Characterisation of electrodeposited nanocrystalline Ni–Mo alloys

  • Elisabeth Chassaing
  • Nicolas Portail
  • Anne-france Levy
  • Guillaume Wang
Article

Abstract

Ni–Mo nanocrystalline layers were electrodeposited using direct current from citrate–ammonia solutions. The quartz crystal microbalance investigation confirms that the discharge process starts with hydrogen evolution before the onset of the alloy deposition. The grain size was estimated from X-ray line broadening. It decreases when the molybdenum content is increased. It is smaller for layers deposited at pH 9.5 than 8.5. The microhardness exhibits a maximum close to 800 Vickers for τMo around 17 wt%. For higher τMo a softening is observed showing a deviation from Hall-Petch behaviour due to small grain size. In deaerated hydrochloric solutions, the layers show a large passivation domain without any pitting. The corrosion currents as well as the passivation currents, higher than for the bulk Hastelloy B alloy, decrease when τMo is increased.

electrodeposition EQCM Ni–Mo nanocrystalline alloys 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • Elisabeth Chassaing
    • 1
  • Nicolas Portail
    • 1
  • Anne-france Levy
    • 1
  • Guillaume Wang
    • 1
  1. 1.Centre d' Etudes de Chimie Métallurgique-CNRSFrance

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