Preparation method for black rhenium coating
A technology of coating and molten salt, which is applied in the field of molten salt electroplating preparation of high-emissivity black rhenium coating, can solve the problems of slow deposition speed, high cost, difficulty in ensuring uniform coating thickness of components, etc., and achieves convenient operation, Improvement of conversion utilization rate and easy control of coating thickness
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Embodiment 1
[0037] A preparation method of black rhenium coating, the process flow is as follows figure 1 As shown, including the following steps:
[0038] (1) Molten salt chlorination:
[0039] In the process of preparing molten salt, such as figure 2 As shown in the molten salt chlorination device, the molten salt chlorination device includes a quartz barrel 14, a quartz cup 15, two inlet pipes and an outlet pipe; the quartz cup 15 is set in the quartz barrel 14, and the top of the quartz barrel 14 is set There is a rubber plug 16 for sealing. Both the inlet pipe and the outlet pipe penetrate the rubber plug 16, one of the inlet pipes is used to pass in chlorine gas, and the other inlet pipe is used to pass in argon gas. When the quartz cup 15 is filled with molten salt, the inlet pipe for chlorine gas is inserted into the molten salt.
[0040] Weigh CsCl and place it in an oven at 200°C for 24h to remove crystal water. Put the dried CsCl into figure 2 In the quartz cup 3 of the molten sal...
Embodiment 2
[0050] A preparation method of black rhenium coating is basically the same as the steps of Example 1, except that the electroplating temperature in step (3) is 850°C.
[0051] Figure 7 with Figure 8 The micro-topography of the surface and fracture of the black rhenium coating prepared in this example are respectively. It can be seen from the figure that the surface of the coating is smooth and gray-black. The grain size of the coating is larger than that of Example 1, and the surface is densely packed with spire-tower-shaped grains with a particle size of less than 10 μm, and the coating thickness is about 40 μm. The pull test was carried out in accordance with the national standard GB 5210-85 "Determination of Coating Adhesion Force Pull Method". The measured average tensile strength was 12.2MPa, and the disconnection position was the junction between the coating and the substrate. The room temperature surface emissivity of rhenium coating is 0.7.
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