A molten salt corrosion-resistant coating comprising a nickel-tantalum active diffusion barrier layer and its preparation method

A technology of corrosion coating and molten salt resistance, which is applied in the direction of coating, superimposed layer plating, metal material coating process, etc. Poor performance and other problems, to avoid the deterioration of the mechanical properties of the matrix, the effect is small, and the interface bonding strength is high

Active Publication Date: 2022-04-05
YANTAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, during the long-term high-temperature service, significant interdiffusion of elements occurred between the stack structure material and the corrosion-resistant coating, specifically as follows: (1) alloying elements (such as Cr and Fe, etc.) diffused into the pure Ni coating , and then diffuse into the molten salt, causing corrosion of the alloy; Ni in the corrosion-resistant layer diffuses into the matrix
(2) The interdiffusion effect leads to the formation of voids at the coating / substrate interface, which seriously reduces the mechanical properties of the system
However, a single refractory metal has poor diffusion resistance, and it is easy to cause the formation of voids at the coating / substrate interface, which affects the mechanical properties of the alloy.
[0004] So far, no molten salt corrosion-resistant coatings using nickel-tantalum as an active diffusion barrier have been reported

Method used

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  • A molten salt corrosion-resistant coating comprising a nickel-tantalum active diffusion barrier layer and its preparation method
  • A molten salt corrosion-resistant coating comprising a nickel-tantalum active diffusion barrier layer and its preparation method
  • A molten salt corrosion-resistant coating comprising a nickel-tantalum active diffusion barrier layer and its preparation method

Examples

Experimental program
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Embodiment 1

[0032] The substrate is made of GH3535 alloy, and the substrate sample is 20×10×4mm. The nickel-tantalum coating is prepared by magnetron sputtering double-target sputtering. The purity of both nickel and tantalum targets is 99.99 wt.%. After cleaning the surface of the matrix sample, put it into the working room, hang the sample between two parallel targets, and vacuum the working room to 7×10 -3 ~1×10 -2 . Heat the substrate sample to 200°C, start sputtering, sputtering power: 2000W for Ni target, 1000W for Ta target; time 1h, nickel-tantalum layer thickness is about 2μm. In this embodiment, the chemical composition and content of the nickel-tantalum inner layer are as follows: the nickel content is about 72.2 wt.%, and the rest is tantalum element.

[0033] The phase analysis of the deposited nickel-tantalum film was carried out, and the X-ray diffraction analysis showed that the prepared nickel-tantalum layer was Ni 8 Ta phase, the result is as follows figure 1 (a) sh...

Embodiment 2

[0039] The base material is Inconel-617 alloy, the base sample is 20×10×4mm, and the nickel-tantalum coating is prepared by magnetron sputtering double-target sputtering. The purity of both nickel and tantalum targets is 99.99 wt.%. After cleaning the surface of the matrix sample, put it into the working room, hang the sample between two parallel targets, and vacuum the working room to 7×10 -3 ~1×10 -2. Heat the substrate sample to 200°C and start sputtering for 2 hours, the thickness of the nickel-tantalum layer is about 4 μm, the sputtering power of the nickel target is 2000W, and the tantalum target is 2600W. In this embodiment, the chemical composition and content of the nickel-tantalum inner layer are as follows: the nickel content is about 50.0 wt.%, and the rest is tantalum element. Then, a pure Ni coating with a thickness greater than 40 μm was prepared on the surface of the sample by sulfamate nickel plating. After the samples were heat treated at 700℃-100h, it wa...

Embodiment 3

[0041] The iron-based Incoloy-800H alloy was used as the substrate, and the substrate sample was 10×10×4mm. The nickel-tantalum coating was prepared by magnetron sputtering. Among them, the purity of the nickel and tantalum targets are both 99.99wt.%. The substrate sample is cleaned and loaded into the working room, the sample is suspended between two parallel targets, and the working room is vacuumed to 7×10 -3 ~1×10 -2 . Heat the substrate sample to 200°C and start sputtering for 2 hours, the thickness of the nickel-tantalum layer is about 4 μm, the sputtering power of the nickel target is 2000W, and the tantalum target is 5600W. In this embodiment, the chemical composition and content of the nickel-tantalum inner layer are as follows: the nickel content is about 31.0 wt.%, and the rest is tantalum element. Then, a pure Ni coating with a thickness greater than 40 μm was prepared on the surface of the sample by sulfamate nickel plating. After the samples were heat treated ...

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Abstract

The invention belongs to the molten salt corrosion-resistant protective coating technology, in particular to a molten salt corrosion-resistant coating comprising a nickel-tantalum active diffusion barrier layer and a preparation method thereof. The high temperature corrosion resistant coating on this substrate consists of a nickel-tantalum inner layer and a pure nickel molten salt corrosion resistant outer layer. The nickel-tantalum diffusion barrier layer can react with alloy elements to form intermetallic compounds during use, which can hinder the interdiffusion between the pure nickel outer layer and the substrate, and has good bonding strength. The invention can prolong the service life of the coating by inhibiting the interdiffusion of alloy elements between the coating and the matrix without damaging the mechanical properties of the matrix. The preparation method is to prepare a nickel-tantalum layer on the surface of the substrate by physical vapor deposition (PVD), and then prepare pure nickel to resist molten salt corrosion by one of electrodeposition, physical vapor deposition, and chemical plating coating preparation methods or a combination thereof. Protective outer layer.

Description

technical field [0001] The invention belongs to molten salt corrosion-resistant protective coating technology, in particular to a corrosion-resistant coating containing a nickel-tantalum active diffusion barrier layer for molten salt reactor (Molten Salt Reactor, MSR) structural material molten salt corrosion protection and a preparation method thereof . Background technique [0002] Applying corrosion-resistant coatings on the surface of superalloys used in molten salt reactor structural materials, such as pure Ni layer, is an effective way to improve the corrosion resistance of molten salt reactor structural materials. However, during the long-term high-temperature service, significant interdiffusion of elements occurred between the stack structure material and the corrosion-resistant coating, specifically as follows: (1) alloying elements (such as Cr and Fe, etc.) diffused into the pure Ni coating , and then diffuse into the molten salt, causing corrosion of the alloy; N...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C14/16C23C28/02C23C18/32C25D3/12
CPCC23C14/16C23C28/021C23C18/32C25D3/12
Inventor 王成旭朱佳慧武明王明佳刘仲礼
Owner YANTAI UNIV
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