A spraying system and method for underwater maintenance
A technology of spraying device and spraying gun, applied in spraying device, liquid spraying device, metal processing equipment and other directions, can solve problems such as maintenance problems of underwater components, and achieve the effect of low cost of use, multiple functions, and small thermal influence of the substrate
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Embodiment 1
[0059] In this embodiment, pure aluminum powder with an average particle size of 20 μm is used as the spray powder, and the substrate 6 is made of copper plate, N 2 As a carrier gas, the gas pressure is 3MPa, and the gas preheating temperature is 300°C. When spraying, the copper substrate is completely in the water 7, and the water in front of the substrate 6 is washed away by the airflow of the spray gun to form a conical area, the powder is deposited well, and the thickness of the deposited coating is about 1mm. Figure 4 This is the SEM photo of the aluminum coating prepared on the copper substrate by the underwater spraying system. From the SEM photo, it can be seen that the aluminum coating is relatively dense, with low porosity, forming an effective coating, and the coating is dense and well bonded to the substrate.
Embodiment 2
[0061] In this example, pure aluminum powder with an average particle size of 45 μm is used to carry out cold spraying connection on the butt joint surface of the 6061 aluminum alloy substrate and the AZ91D magnesium alloy substrate, nitrogen is used as the carrier gas, the gas pressure is 3Mpa, and the powder feeding gas pressure is 3.4Mpa. The substrate is placed under water, the gas preheating temperature is 250°C, and a structural connection with good strength is formed through the mechanical combination of the coating and the substrate.
Embodiment 3
[0063] In this example, pure copper powder with an average particle size of 20 μm is used to add vol.30% stainless steel shot peening particles as spray powder, and the substrate is copper plate, N 2 As the powder feeding gas, the gas feeding pressure is 3Mpa, and the gas preheating temperature is 380°C. When spraying, the copper substrate is connected to the mechanical control system and immersed in water, and the water in front of the substrate is washed away by the front end of the spray gun to form a local dry area, forming a good coating structure.
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Abstract
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