Abstract
In order to slow down the corrosion and wear of offshore equipment, the Zn–Al composite coating was prepared on Q345 substrate by cold spray technique. The mass fraction of Zn and Al in the raw material was 2:3. The microstructure of the original coating was observed by scanning electron microscopy (SEM) and was characterized by energy dispersive spectrometer (EDS). From the composite alloy coating obtained by cold spraying, it was observed that the Zn and Al particles were uniformly distributed without oxidation product, and the powder particles were significantly plastically deformed. The microstructure of the composite coating is very dense and has strong adhesion to the substrate. Neutral salt spray test (NSS) and electrochemical accelerated corrosion test results showed that Zn–Al composite coating can effectively provide corrosion protection.
Highlights
In the context of large-scale development and utilization of marine resources, marine transportation, fisheries, and maritime military are inseparable from offshore equipment
The composite coating is magnified 50×, and it can be visually observed that the distribution of the two metal powders in the layer is uniform. It indicates that the mixing of the Zn and Al powder particles is uniform; as shown in Figure 1b, the composite coating is enlarged by 1000 times, and two kinds of bright and dark elements can be clearly observed; as shown in Figure 1c, upper part is a composite coating, and the lower part is the base
In composite coating waswas prepared on the substrate by cold
Summary
In the context of large-scale development and utilization of marine resources, marine transportation, fisheries, and maritime military are inseparable from offshore equipment. A large amount of natural electrolytes forms a corrosive environment, which causes serious damage to the surface of offshore equipment. Corrosion and fouling bring great losses to the Chinese. It is of great significance to effectively protect metal materials in the marine environment. The research on marine metal materials has received extensive attention from scholars [1,2,3,4,5]. The surface treatment methods commonly used on the surface of marine equipment include thermal spraying, organic coating, hot dip plating, and the like [6,7,8,9]. In the preparation of thermal spray coating, it becomes semi-molten or molten during the thermal spraying process
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