Effects of surfactants in an electroless nickel-plating bath on the properties of Ni-P alloy deposits

B. H. Chen, L. Hong, Y. Ma, T. M. Ko

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91 Citations (Scopus)


Effects of added surfactants in the acidic hypophosphite plating baths on the properties of the resulting electroless nickel-phosphorus (Ni-P) deposits on the brass substrates were studied. The surface appearance and microstructures were examined under a reflective optical microscope and a scanning electron microscope equipped with an in situ energy-dispersive X-ray spectroscopy with which the phosphorus contents were measured. The deposition rate and the corrosion rate of the Ni-P deposits were estimated respectively from the weight gains and losses after a period of time. It is found that the addition of suitable amounts of surfactants can increase the deposition rate up to 25% and reduce the formation of the pores on the surface of Ni-P alloys, as well as enhance the corrosion resistance of the deposits. The corrosion rate of the Ni-P alloys in 10 wt % HCl was determined. The corresponding corrosion rate fits well as an empirical power function having an order of near 1/3 in the amount of dissolved Ni-P deposits, equivalent to the concentration of nickel ions present in the acidic corrosive solution. The corrosion mechanism is discussed in line with the experimental discoveries.

Original languageEnglish
Pages (from-to)2668-2678
Number of pages11
JournalIndustrial and Engineering Chemistry Research
Issue number11
Publication statusPublished - 2002 May 29

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering


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