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

• DOI: 10.1016/j.jmrt.2022.01.022
• Publication Date: 2022-01-12T20:44:27Z
• Authors: Timo Rautio; Hamidreza Torbati...; Tarek Allam; Antti Järvenpää; Atef Hamada
• Keywords: info:eu-repo/classification/ddc/670; Mining engineering. Metallurgy; 670; 0203 mechanical engineering; Additive manufacturing; Corrosion resistance; TN1-997; Electrical resistivity; 02 engineering and technology; Gold-nickel coating; AlSi10Mg alloy

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 electrochemical behavior. Characterization of Au–Ni was performed a scanning electron microscope equipped with energy dispersive X-ray spectroscopy (EDS) x-ray diffraction study tiny features. The surface indentation hardness coated evaluated coating strength. behavior as-built part its counterpart, surfaces, conducting potentiodynamic polarization (PDP) impedance (EIS) in 3.5% NaCl solution. results revealed that layers thickness ∼2 10 μm, respectively, could overcome critical defects, i.e., pores flaws. AM has significantly increased six times due hard Ni layer. measurements showed significant decrease anodic dissolution rate increase pitting corrosion resistance for surfaces compared bare polished condition chloride This attributed stability against overpotential. Moreover, it observed reduce studied 40%. Consequently, property enhanced both procedures.