Influence of ALD-Al2O3 film on anti-scratch and anti-tarnish of silver

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

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Author(s)

  • Jiankang Huang
  • Xiang Yu
  • P. W. Shum
  • Zhifeng Zhou
  • Yijie Ma

Detail(s)

Original languageEnglish
Pages (from-to)490–496
Number of pages7
Journal / PublicationSurface Engineering
Volume37
Issue number4
Online published2 Jun 2020
Publication statusPublished - 2021

Abstract

We report on atomic layer deposition (ALD) of Al2O3 films onto 925 silver and assess their efficiency to prevent metal scratching and tarnishing. Films of five thicknesses (12, 16, 21, 25 and 31 nm) were deposited on the 925 silver. Optical characterization revealed that the colour difference of coated silver increased with film thickness, where the film thickness below 25 nm preserves the lustre of the silver. The tarnishing resistance increased with film thickness, and films thicker than 16 nm were resistant to corrosion in Na2S solution. The hardness and modulus of the film were 6.4 and 2 times that of 925 silver, respectively. Thicker films enhanced resistance to tarnishing and scratching and also led to a loss of lustre. A thickness of 25 nm was found to have an admirable combined performance. It is promising for applications of ALD process for silver protection.

Research Area(s)

  • Alumina, anti-scratch, anti-tarnish, Atomic layer deposition, film thickness, sterling silver

Citation Format(s)

Influence of ALD-Al2O3 film on anti-scratch and anti-tarnish of silver. / Huang, Jiankang; Yu, Xiang; Shum, P. W.; Zhou, Zhifeng; Ma, Yijie.

In: Surface Engineering, Vol. 37, No. 4, 2021, p. 490–496.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review