Gold–silver electroless plating on laser powder-bed fusion additively printed alsi10mg parts

Alexandra Inberg, Dana Ashkenazi, Giora Kimmel, Yosi Shacham-Diamand, Adin Stern

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

The current research presents a novel methodology for surface finishing of printed AlSi10Mg parts by electroless deposited gold–silver (electrum) alloys. The parts were printed by additive manufacturing laser powder-bed fusion (AM-LPBF). The electrum was chosen due to its appearance and good electrical and thermal properties and was deposited on disk-shaped specimens at 80 and 90 °C. The coating quality and appearance were studied by different methods for various deposition times and film thicknesses. The results indicate that Au–Ag coatings of AMLPBF AlSi10Mg yield satisfactory results. The XRD analysis revealed that the coatings were composed of Au–Ag crystalline phases and beneath them, a quasi-amorphous or mixed quasiamorphous and nanocrystalline Ni–P interlayer. The mechanism of electrum formation was studied based on the XPS analysis results as a function of the temperature and concentration. At 80 °C, the Ag was dominant at the beginning of the deposition process, while at 90 °C the Au was first detected on the interface. This result was explained by the electrochemical properties of alloying metals and the binding energies required to form metal–Ni and Au–Ag bonding. The results indicate that the electrum coatings are satisfactory, and the developed surface finishing process could be used for many applications.

Original languageEnglish
Article number557
JournalMetals
Volume10
Issue number5
DOIs
StatePublished - 1 May 2020

Keywords

  • Additive manufacturing
  • AlSi10Mg substrate
  • Electroless plating
  • Gold–silver coating
  • Laser powder-bed fusion
  • NiP interlayer

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