Abstract
Two composite coatings, Zn65Al15Mg5ZnO15 and Zn45Al35Mg5ZnO15, were prepared by the cold spray technique and were found to be compact, with no pits or cracks, based on scanning electron microscope (SEM) and energy-dispersive X-ray spectroscopy (EDS) investigations. The results of the neutral salt spray (NSS) and electrochemical tests showed that the two composite coatings possess a suitable corrosion performance. However, the Zn45Al35Mg5ZnO15 composite coatings were more corrosion resistant and allowed a better long-term stability. In addition, they were found to exhibit the best wear resistance and photocatalytic degradation efficiency.
Highlights
As a result of the larger development and utilization of marine resources, metallic materials representing the main building elements of the engineering equipment operating in the marine environment are strongly affected by its corrosive nature, significantly shortening their lifetime.increased interest has been given to the development of efficient protective coatings suitable to be applied on the metallic parts of offshore equipment [1,2,3,4].Currently, the commonly used surface treatment procedures for equipment working in the marine environment include thermal spraying, hot dip coating, and organic coating [5,6,7,8]
The results show that the corrosion of the Zn45 Al35 Mg5 ZnO15 composite coating is regularly stratified and that there are no pits and cracks in the corrosion process
The results show that the corrosion of the Zn65 Al15 Mg5 ZnO15 composite coating is not uniform and that deep pits and cracks are produced after 240 h of corrosion
Summary
As a result of the larger development and utilization of marine resources, metallic materials representing the main building elements of the engineering equipment operating in the marine environment are strongly affected by its corrosive nature, significantly shortening their lifetime.increased interest has been given to the development of efficient protective coatings suitable to be applied on the metallic parts of offshore equipment [1,2,3,4].Currently, the commonly used surface treatment procedures for equipment working in the marine environment include thermal spraying, hot dip coating, and organic coating [5,6,7,8]. Known as cold gas spray, is a new surface treatment technology which has been rapidly developed in recent years. It uses compressed gas (air, helium, nitrogen, etc.) as an accelerated gas stream to drive powder particles (particle size 1–50 μm) to collide with the substrate at low temperature (room temperature to 600 ◦ C), supersonic speed (300–1200 m/s), and complete solid state so that the particles undergo strong plastic deformation and deposit to form a coating [9,10,11,12,13,14]
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