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

Active Publication Date: 2018-02-16
NAT UNIV OF DEFENSE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the traditional CVD technology has a slow deposition rate and high cost, and it is difficult to ensure the uniformity of the coating thickness at each position of the component when preparing components with complex shapes.

Method used

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  • Preparation method for black rhenium coating
  • Preparation method for black rhenium coating
  • Preparation method for black rhenium coating

Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a preparation method for a black rhenium coating. The preparation method comprises the following steps that S1, molten salt chlorination is performed, wherein under inert gas protection, after CsCl is heated to a molten state, K2ReCl6 is added, the molten salt containing K2ReCl6 is obtained, chlorine is introduced into the molten salt containing K2ReCl6, chlorinating is performed, and after cooling, the chlorinated molten salt is obtained; and S2, electroplating is performed, wherein the chlorinated molten salt obtained in the step S1 is heated to the molten state underinert gas protection, a plating piece base body is immersed into the chlorinated molten salt in the molten state, the chlorinated molten salt in the molten state is a plating solution, the plating piece base body is used as a negative electrode, an inert electrode is used as a positive electrode, electroplating is performed after electrification, and the black rhenium coating is obtained on the plating piece base body. The preparation method is low in cost and high in deposition rate, and the prepared black rhenium coating is good in uniformity.

Description

Technical field [0001] The invention belongs to the technical field of molten salt electrochemistry and surface coating, and relates to a preparation method of black rhenium coating, in particular to a molten salt electroplating preparation method of high emissivity black rhenium coating. Background technique [0002] Rhenium (Rhenium) is a rare refractory metal with high melting point (3180℃), high modulus, excellent high temperature mechanical properties and thermal shock resistance. These properties make rhenium particularly suitable for ultra-high temperature and strong thermal shock work Used in the environment. In addition, metal rhenium also has very good wear resistance and corrosion resistance. The wear resistance of rhenium is second only to metal osmium (Os), and it can maintain relatively good chemical inertness for most fuel gases except oxygen. At present, rhenium is mainly used in high-temperature fields such as high-temperature structures and energy systems (such...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/66C25D5/00C25D17/00
CPCC25D3/66C25D5/003C25D17/004
Inventor 朱利安叶益聪白书欣张虹白宏德王江帆黄永乐
Owner NAT UNIV OF DEFENSE TECH
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