University of Oulu

Timo Rautio, Hamidreza Torbati-Sarraf, Tarek Allam, Antti Järvenpää, Atef Hamada, Enhancement of electrical conductivity and corrosion resistance by gold-nickel coating of additively manufactured AlSi10Mg alloy, Journal of Materials Research and Technology, Volume 17, 2022, Pages 521-536, ISSN 2238-7854,

Enhancement of electrical conductivity and corrosion resistance by gold-nickel coating of additively manufactured AlSi10Mg alloy

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Author: Rautio, Timo1; Torbati-Sarraf, Hamidreza2; Allam, Tarek3,4;
Organizations: 1Kerttu Saalasti Institute, University of Oulu, Pajatie 5, 85500, Nivala, Finland
2School of Materials Engineering, Purdue University, West Lafayette, IN, 47907, USA
3Steel Institute, RWTH Aachen University, Intzestraße 1, 52072, Aachen, Germany
4Department of Metallurgical and Materials Engineering, Suez University, 43528, Suez, Egypt
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.8 MB)
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Language: English
Published: Elsevier, 2022
Publish Date: 2022-04-19


Gold-nickel coatings (Au–Ni) were applied by electrodeposition (ED) and electroless deposition (ELD) on additively manufactured (AM) AlSi10Mg alloy to improve the electrical conductivity and electrochemical behavior. Characterization of the Au–Ni coatings was performed by a scanning electron microscope equipped with energy dispersive X-ray spectroscopy (EDS) and x-ray diffraction to study the tiny features. The surface indentation hardness of the coated alloy was evaluated to study the coating strength. The electrochemical behavior of the as-built part and its counterpart, Au–Ni coated surfaces, were evaluated by conducting potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) in a 3.5% NaCl solution.

The results revealed that the Au–Ni coatings with layers thickness of ∼2 and 10 μm, respectively, could overcome the surface critical defects, i.e., pores and flaws. The surface hardness of the coated AM alloy has significantly increased six times due to the hard Ni layer. The electrochemical measurements showed a significant decrease in the anodic dissolution rate and increase in pitting corrosion resistance for the Au–Ni coated surfaces compared to the bare AM AlSi10Mg alloy with the as-built and polished surface condition in chloride solution. This was attributed to the stability of the Au–Ni coatings against the anodic overpotential. Moreover, it was observed that the Au–Ni coatings reduce the electrical resistance of the studied AM alloy by 40%. Consequently, the surface electrical conductivity property of the AM AlSi10Mg alloy was enhanced by both Au–Ni coating procedures.

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Series: Journal of materials research and technology
ISSN: 2238-7854
ISSN-E: 2214-0697
ISSN-L: 2238-7854
Volume: 17
Pages: 521 - 536
DOI: 10.1016/j.jmrt.2022.01.022
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Funding: The authors would like to acknowledge the financial support received from the Council of Oulu Region, City of Nivala, Nivala Industrial Park Ltd., NIHAK Nivala-Haapajärvi region registered association and the European Union (European Regional Development Fund) for the “Hybridi” and ”M3D” projects. We also would like to express our gratitude to Eforit Oy, Sipoo, Finland for conducting the industrial gold-nickel coatings.
Copyright information: © 2022 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (