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Surface Engineering Volume 37, 2021 - Issue 4: Special Issue: Properties
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Research Articles

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

Jiankang Huanga Beijing Key Laboratory of Materials Utilisation of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Haidian, People’s Republic of ChinaView further author information
,
Xiang Yua Beijing Key Laboratory of Materials Utilisation of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Haidian, People’s Republic of ChinaCorrespondence[email protected]
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,
P. W. Shumb Adtech Materials Ltd, Hong Kong, People’s Republic of ChinaORCID Iconhttps://orcid.org/0000-0001-7136-0757View further author information
ORCID Icon,
Zhifeng Zhouc Advanced Coatings Applied Research Laboratory (ACARL), Department of Mechanical and Biomedical Engineering, City University of Hong Kong, Kowloon, Hong KongView further author information
&
Yijie Maa Beijing Key Laboratory of Materials Utilisation of Nonmetallic Minerals and Solid Wastes, National Laboratory of Mineral Materials, School of Materials Science and Technology, China University of Geosciences (Beijing), Haidian, People’s Republic of ChinaView further author information
Pages 490-496 | Received 19 Mar 2020, Accepted 11 May 2020, Published online: 02 Jun 2020
 
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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.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

The National Natural Science Foundation of China [grant number 51571183] support this work.

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