Influence of Surface Pretreatment on the Corrosion Resistance of Cold-Sprayed Nickel Coatings in Acidic Chloride Solutio
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Influence of Surface Pretreatment on the Corrosion Resistance of Cold-Sprayed Nickel Coatings in Acidic Chloride Solution Mieczyslaw Scendo, Wojciech Zorawski, Katarzyna Staszewska-Samson, Medard Makrenek, and Anna Goral (Submitted January 16, 2017; in revised form January 31, 2018) Corrosion resistance of the cold-sprayed nickel coatings deposited on the Ni surface (substrate) without and with abrasive grit-blasting treatment of the substrate was investigated. The corundum powder with different grain sizes was used. The corrosive environment contained an acidic chloride solution. The mechanism of the corrosion of nickel was suggested and discussed. Corrosion electrochemical parameters were determined by electrochemical methods. The corrosion effect of a nickel coating depends on the grain size used to prepare the substrate. The nickel coating after the medium grit-blasting treatment of the substrate was found to be the most corrosion resistant. However, the smallest resistance on the corrosion effect should be attributed to the nickel coating on the substrate after the coarse grit-blasting treatment. Keywords
abrasive grit-blasting treatment, acidic chloride solution, cold spray, corrosion electrochemical parameters, nickel
1. Introduction Cold spraying (CS) is a solid-state process where the coating is formed by powder particles impacting with high kinetic energy because of their high velocity. The coating is formed when particles impacting on the substrate surface are plastically deformed and adhere to the substrate (Ref 1). However, roughness, the treatment of a substrate, and the oxide passivation layer directly affect coating adhesion (Ref 2, 3). The cold spraying as an emerging coating technique has been developed to deposit high-quality metallic coatings. The advantages presented by low temperatures in cold spraying make it possible to deposit coatings on a wide range of materials. Among them, the authors (Ref 4) by CS method covered the surface of aluminum with copper layer. It turned out that CuAl2 phase appeared on Al surface. Titanium and its alloys show excellent corrosion resistance and can be widely used for the protection of material substrates. The potentiodynamic polarization measurement reveals that cold-sprayed Ti coating has much higher corrosion resistance than carbon steel and can provide favorable protection for the steel substrate (Ref 5). Tantalum is a sought-after metal with very good resistance against corrosion in various acid solutions, salt solutions, and organic compounds even at elevated temperatures. Corrosion resistance of the CS Ta coating is ensured by Mieczyslaw Scendo and Katarzyna Staszewska-Samson, Institute of Chemistry, Jan Kochanowski University in Kielce, Swietokrzyska 15G, 25406 Kielce, Poland; Wojciech Zorawski and Medard Makrenek, University of Technology in Kielce, 1000-lecia Panstwa Polskiego 7, 25314 Kielce, Poland; and Anna Goral, Institute of Metallurgy and Materials Science of the Polish Academy of Sciences in Krakow, Reymonta
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