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Microstructural Studies of Cold Sprayed Copper, Nickel, and Nickel-30% Copper Coatings

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Abstract

Cold spraying enables to produce metallic coatings with low porosity level and low oxygen content. Several material properties such as electrical conductivity and corrosion resistance rely on these properties. Aim of this study was to characterize microstructural properties of cold sprayed copper, nickel, and nickel-30%copper coatings. Microstructures, denseness, and deformation of particles were investigated. SEM analysis and corrosion tests were done to get information of through-porosity. Open porosity has an important role on protectiveness of anodically protective coatings, such coating materials like copper and nickel. In this study, cold-sprayed Cu coating was fully dense. However, cold-sprayed Ni and Ni-30%Cu coatings seemed to be microstructurally dense but some porosity in some areas of the coatings especially in some parts of particle boundaries was noticed after corrosion tests. Furthermore, effect of annealing to microstructure and corrosion test behavior was studied. Cold sprayed Ni coating became denser during heat treatment.

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Acknowledgments

The authors would like to thank Mr. Werner Krömmer from Linde AG Gas for spraying coatings and for valuable discussions. The work in which this study was done was funded by The National Technology Agency of Finland (Tekes) and some Finnish industrial companies.

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Correspondence to Heli Koivuluoto.

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Koivuluoto, H., Lagerbom, J. & Vuoristo, P. Microstructural Studies of Cold Sprayed Copper, Nickel, and Nickel-30% Copper Coatings. J Therm Spray Tech 16, 488–497 (2007). https://doi.org/10.1007/s11666-007-9060-5

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  • DOI: https://doi.org/10.1007/s11666-007-9060-5

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