Abstract
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.
Highlights
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 results show that there is no degradation of the WC-Co powder during the cold spray process and a wellbonded and phase pure WC coating can be produced
The following conclusions can be drawn from the study: 1. The scanning electron microscope (SEM) cross-sectional micrographs revealed a good homogeneous connection between the substrate and the nickel coating layer for all specimens
Summary
The formation of the passive oxide film of Ta2O5 on surface of coating. the electrochemical tests in concentrated alkaline solutions revealed the stable passive behavior of the CS tantalum coatings (Ref [6, 7]). The cold-sprayed zinc coatings are thick, dense and provide an efficient barrier protection for a mild steel surface without exposing the substrate to corrosion (Ref 8). Considerable research (Ref 11) on coating magnesium alloys with aluminum powder using the CS technique and its effect on the corrosion resistance and mechanical properties of the Mg alloy has been done. A number of investigations on the characteristic mechanical and tribological properties of the cold-sprayed titanium coatings on commercial Ti-6Al-4V substrates have been performed (Ref [19,20,21,22,23]). The abrasive grit-blasting treatment (ABT) of metals is widely used for the preparation of the substrate for the cold-sprayed coating process. In the literature, we have not found any information about the effect of the substrate (Ni(s)) treatment on the corrosion resistance of the cold-sprayed nickel coating (Ni(c)), especially in aggressive environments.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
