Journal of Applied Electrochemistry

, Volume 37, Issue 11, pp 1375–1381 | Cite as

Surface characterization of zincated aluminium and selected alloys at the early stage of the autocatalytic electroless nickel immersion process

Original Paper

Abstract

In this work the changing structure of nickel–phosphorus deposits on aluminium and its alloys at the early stage of electroless nickel phosphorus deposition using hypophosphite ion as reducing agent has been studied. Prior to electroless nickel deposition, zincating is used for pre-treatment of aluminium substrates. The surface morphology and structure of the electroless Ni–P layers were characterized by scanning electron microscopy and X-ray diffraction analysis. Results show that Ni–P deposition is closely related to the dissolution of the zincating layer, followed by progressive nickel nucleation. The nuclei serve as a catalytic surface for further Ni–P deposition which increases with deposition time. The growth and coalescence of the nuclei on the aluminium substrate results in crystalline layers of Ni–P.

Keywords

Electroless nickel–Phosphorus deposition (Ni–P) Zincating Pre-treatment 

Notes

Acknowledgements

We express our gratitude to the Engineering and Physical Sciences Research Council, UK for the sponsorship of the project and Macdermid PlC for providing some of the materials and equipment used. The authors thank Prof. Craig Williams of the School of Applied Sciences, University of Wolverhampton for his support in the X-ray diffraction analysis.

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Copyright information

© Springer Science+Business Media B.V. 2007

Authors and Affiliations

  1. 1.School of Engineering & Built EnvironmentUniversity of WolverhamptonTelfordUK
  2. 2.MacDermid PlCBirminghamUK

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