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Protective coating capable of resisting medium-high temperature steam corrosion as well as preparation method and application thereof

A protective coating, medium and high temperature technology, applied in coatings, metal material coating processes, vacuum evaporation coating and other directions, can solve threats to the safe operation of industrial boilers, waste incinerators in power generation facilities, loss of power factor of nuclear power plants, and reduce nuclear power plants. Operation efficiency and other issues, to achieve the effect of long life and medium and high temperature water vapor protection performance, excellent resistance to medium and high temperature water vapor corrosion performance, and reliable medium and high temperature water vapor protection performance

Active Publication Date: 2021-04-23
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, long-term operation in the harsh environment of the primary circuit, the water vapor in the pipeline has a serious corrosion effect on stainless steel under high temperature and high pressure conditions, resulting in a loose oxide layer on the inner wall of the pipeline, which reduces the effective wall thickness of the steel and causes the wall properties to change. Changes that affect the safe operation of the primary circuit pipeline
The light ones can lead to the loss of power factor of the nuclear power plant and reduce the operating efficiency of the nuclear power plant. The severe ones can cause the rupture of recirculation pipes and other components in the reactor, causing the nuclear power plant to be shut down for repairs, causing huge economic losses, or leading to nuclear radiation leakage accidents. Threatening people's safety
On the other hand, in the Fukushima nuclear power plant accident in Japan in March 2011, due to the lack of cooling water under the accident conditions, the Zr alloy cladding and water vapor had a corrosion reaction, and the violent exothermic reaction produced a large amount of hydrogen and heat, resulting in Core melting and hydrogen explosion, nuclear fuel leakage, have caused great negative impact on society and environment
In addition, steam corrosion also seriously threatens the safe operation of industrial boilers, power generation facilities, and waste incineration plants, and is an urgent industrial problem that needs to be solved

Method used

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  • Protective coating capable of resisting medium-high temperature steam corrosion as well as preparation method and application thereof
  • Protective coating capable of resisting medium-high temperature steam corrosion as well as preparation method and application thereof
  • Protective coating capable of resisting medium-high temperature steam corrosion as well as preparation method and application thereof

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preparation example Construction

[0037] As another aspect of the technical solution of the present invention, it relates to the preparation method of the aforementioned protective coating resistant to medium and high temperature water vapor corrosion, which includes: adopting arc ion plating technology to sequentially deposit a Cr layer, a CrC layer, Cr layer and Cr-Al-C film layer to form Cr / CrC / Cr / Cr-Al-C multilayer film coating, followed by medium and low temperature annealing treatment to obtain Cr / CrC / CrAl x / Cr 2 AlC coating, that is, to obtain the protective coating against medium and high temperature water vapor corrosion.

[0038] In some embodiments, the preparation method further includes: before depositing the Cr layer on the surface of the substrate, etching the substrate with ionized argon ions.

[0039] Further, the process conditions adopted in the etching treatment include: the chamber pressure is 0.2-0.6Pa, the Ar flow rate is 20sccm-60sccm, the anode ion source current is 0.1-0.3A, and the...

Embodiment 1

[0081] Put the Zr alloy matrix after cleaning and drying into the vacuum chamber, first pass into the vacuum chamber 40sccm of argon gas, set the current of the linear anode ion source to 0.2A, and the chamber pressure to 0.4Pa. The substrate was etched by ions for 30 minutes; then the Cr bonding layer was deposited by arc ion plating technology, the target was Cr target, the substrate negative bias was -150V, the arc current was 70A, the Ar gas pressure was 1.0Pa, and the deposition thickness was 1.5μm ; Then pass the reaction gas CH 4 , CH 4 The air pressure is 1.5Pa, the arc current is 70A, the bias voltage is -100V, and the CrC diffusion barrier layer is deposited with a thickness of 4.5μm; the third step is to introduce Ar gas, the Ar gas pressure is 1.0Pa, the arc current is 70A, and the bias voltage is -100V, the deposition thickness is 2.0μm; the fourth step uses arc ion plating technology to deposit Cr-Al-C coating, the target is CrAl composite target, the current is...

Embodiment 2

[0084] Put the cleaned and dried Zr alloy substrate into the vacuum chamber, firstly feed 20 sccm of argon gas into the vacuum chamber, set the current of the linear anode ion source to 0.1A, and the chamber pressure to 0.6Pa. The substrate was etched by ions for 40 minutes; then the Cr bonding layer was deposited by arc ion plating technology, the target was Cr target, the negative bias of the substrate was -100V, the arc current was 60A, the Ar gas pressure was 1.5Pa, and the deposition thickness was 0.5μm ; Then pass the reaction gas CH 4 , CH 4 The pressure is 1Pa, the arc current is 60A, the bias voltage is -150V, and the CrC diffusion barrier layer is deposited with a thickness of 1μm; the third step is to introduce Ar gas, the Ar gas pressure is 1.5Pa, the arc current is 60A, and the bias voltage is - 150V, the deposition thickness is 2.5μm; the fourth step uses arc ion plating technology to deposit Cr-Al-C coating, the target is CrAl composite target, the current is 6...

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Abstract

The invention discloses a protective coating capable of resisting medium-high temperature steam corrosion as well as a preparation method and application of the protective coating. The protective coating comprises a Cr layer serving as a bonding layer, a CrC layer serving as a diffusion impervious layer, a CrAlx layer serving as a connecting layer and a Cr2AlC layer serving as a surface functional layer which are sequentially stacked in the thickness direction of the protective coating. The preparation method comprises the steps that an arc ion plating technology is adopted, a Cr layer, a CrC layer, a Cr layer and a CrAlC film layer are sequentially deposited on the surface of a base body, a Cr / CrC / Cr / CrAlC multi-layer film coating is formed, then medium and low temperature annealing is conducted, and the protective coating is obtained. The arc ion plating technology is adopted, Cr and CrAl targets and the flow of introduced hydrocarbon gas are controlled, subsequent heat treatment is combined, the process is simple and controllable, and industrial production can be achieved. The prepared coating has excellent medium-high temperature steam corrosion resistance, and the problem of steam corrosion of alloy under the medium-high temperature condition can be solved.

Description

technical field [0001] The invention relates to a protective coating, in particular to a protective coating resistant to medium-high temperature water vapor corrosion and its preparation method and application, belonging to the technical field of surface treatment. Background technique [0002] Vapor corrosion is an important factor that seriously endangers the safe operation of nuclear power plants. On the one hand, long-term operation in the harsh environment of the primary circuit, the water vapor in the pipeline has a serious corrosion effect on stainless steel under high temperature and high pressure conditions, resulting in a loose oxide layer on the inner wall of the pipeline, which reduces the effective wall thickness of the steel and causes the wall properties to change. Changes affect the safe operation of the primary circuit pipeline. The light ones can lead to the loss of power factor of the nuclear power plant and reduce the operating efficiency of the nuclear ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/32C23C14/16C23C14/06C23C14/02C23C14/54C23C14/58
CPCC23C14/325C23C14/16C23C14/0635C23C14/5806C23C14/54C23C14/022C23C14/0021
Inventor 汪爱英王振玉柯培玲阮海涛李忠昌
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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