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Effect of gold on the corrosion behavior of an electroless nickel/immersion gold surface finish

  • Q. V. Bui
  • , N. D. Nam
  • , J. W. Yoon
  • , D. H. Choi
  • , A. Kar
  • , J. G. Kim
  • , S. B. Jung
  • Sungkyunkwan University
  • CSIR - National Metallurgical Laboratory

Research output: Contribution to journalArticlepeer-review

Abstract

The performance of surface finishes as a function of the pH of the utilized plating solution was evaluated by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization tests in 3.5 wt.% NaCl solution. In addition, the surface finishes were examined by x-ray diffraction (XRD), and the contact angle of the liquid/solid interface was recorded. NiP films on copper substrates with gold coatings exhibited their highest coating performance at pH 5. This was attributed to the films having the highest protective efficiency and charge transfer resistance, lowest porosity value, and highest contact angle among those examined as a result of the strongly preferred Au(111) orientation and the improved surface wettability.

Original languageEnglish
Pages (from-to)1937-1942
Number of pages6
JournalJournal of Electronic Materials
Volume40
Issue number9
DOIs
StatePublished - Sep 2011

Keywords

  • corrosion resistance
  • Electronic materials
  • gold
  • NiP

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