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A kind of fluoride molten salt and/or chloride molten salt corrosion protection method

A molten salt corrosion and chloride technology, used in the field of material corrosion protection, can solve the problems of inability to form a protective surface film, thermodynamic instability, corrosion, etc., to inhibit intergranular corrosion, slow down intergranular corrosion, and reduce corrosion rates. Effect

Active Publication Date: 2019-09-06
上海联和日环能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The invention overcomes the thermodynamic instability of chromium element in stainless steel and corrosion-resistant alloy in the prior art in fluoride molten salt and / or chloride molten salt system, selective dissolution occurs, unable to form a protective surface film, and obvious corrosion occurs The defects of the invention provide a corrosion protection method of fluoride molten salt and / or chloride molten salt

Method used

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  • A kind of fluoride molten salt and/or chloride molten salt corrosion protection method
  • A kind of fluoride molten salt and/or chloride molten salt corrosion protection method
  • A kind of fluoride molten salt and/or chloride molten salt corrosion protection method

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The molten salt system in this embodiment is a static constant temperature system.

[0038] 1. Pretreatment of 316L stainless steel

[0039] Cut the 316L stainless steel into a sample with a size of 10mm×10mm×2mm by wire cutting method, and punch a hole with a diameter of φ2mm on the sample. The surface of all samples was polished step by step with SiC sandpaper to 2000 mesh, then ultrasonically cleaned with deionized water and absolute ethanol in sequence, and dried with a hair dryer and cold air.

[0040] 2. Corrosion protection method of 316L stainless steel in FLiNaK molten salt at 700 °C

[0041] Add the pretreated 316L stainless steel sample into a graphite crucible, weigh 200g of solid LiF-KF-NaF (46.5-11.5-42mol%, FLiNaK) salt, and then add 500ppm of CrF to the FLiNaK salt. 2 (95% purity), mix well. Put the mixed salt into the graphite crucible, cover the graphite cover, put the graphite crucible into the outer layer 316 stainless steel crucible, and weld the...

Embodiment 2

[0043] The molten salt system in this embodiment is a static constant temperature system.

[0044] 1. Pretreatment of 316L stainless steel

[0045] Cut the 316L stainless steel into a sample with a size of 10mm×10mm×2mm by wire cutting method, and punch a hole with a diameter of φ2mm on the sample. The surface of all samples was polished step by step with SiC sandpaper to 2000 mesh, then ultrasonically cleaned with deionized water and absolute ethanol in sequence, and dried with a hair dryer and cold air.

[0046] 2. Corrosion protection method of 316L stainless steel in FLiNaK molten salt at 700 °C

[0047] Add the pretreated 316L stainless steel sample into a graphite crucible, weigh 200g of solid LiF-KF-NaF (46.5-11.5-42mol%, FLiNaK) salt, and then add 2000ppm of CrF to the FLiNaK salt. 2 (95% purity), mix well. Put the mixed salt into the graphite crucible, cover the graphite cover, put the graphite crucible into the outer layer 316 stainless steel crucible, and weld th...

Embodiment 3

[0049] The molten salt system in this embodiment is a static constant temperature system.

[0050] 1. Pretreatment of 304 stainless steel

[0051] Cut 304 stainless steel into a sample with a size of 10mm×10mm×2mm by wire cutting method, and punch a hole with a diameter of φ2mm on the sample. The surface of all samples was polished step by step with SiC sandpaper to 2000 mesh, then ultrasonically cleaned with deionized water and absolute ethanol in sequence, and dried with a hair dryer and cold air.

[0052] 2. KCl-MgCl of 304 stainless steel at 750°C 2 Corrosion protection methods in molten salt

[0053] Add the pretreated 304 stainless steel sample into the graphite crucible, weigh 200g solid KCl-MgCl 2 (68-32mol%) salt, then to KCl-MgCl 2 Add 1000ppm CrCl to the salt 2 (purity is 99.9%), mix well. Put the mixed salt into the graphite crucible, cover the graphite cover, put the graphite crucible into the outer layer 316 stainless steel crucible, and weld the stainless ...

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Abstract

The invention discloses fluoride molten salt and / or a fluoride molten salt corrosion protection method. The corrosion protection method comprises the following step: uniformly mixing stainless steel or corrosion resistant alloy served molten salt and / or fluoride molten salt system with CrF2 and / or CrCI2, wherein the concentration of Cr<2+> is 100-5000ppm. The corrosion protection method disclosed by the invention is simple and feasible, safe and environment-friendly, and easy to operate and control, and can remarkably reduce the corrosion rate of stainless steel or corrosion resistant alloy in high-temperature fluoride and fluoride molten salt, effectively inhibit and relieve the problem of intergranular corrosion, and prolong the service life of the stainless steel or corrosion resistant alloy in high-temperature fluoride and fluoride molten salt. By adopting the corrosion protection method, not only can the material selection scope of alloy structural materials for fluoride and fluoride molten salt medium be widened, and equipment manufacture and machining cost be lowered, but also the unique advantages of fluoride and fluoride molten salt can be sufficiently utilized, so that the fluoride and fluoride molten salt can be used as novel high-temperature heat transfer and storage medium to be popularized and applied in the field of high-temperature energy.

Description

technical field [0001] The invention relates to the field of material corrosion protection, in particular to a corrosion protection method for fluoride molten salt and / or chloride molten salt. Background technique [0002] Fluoride molten salt and chloride molten salt, as a new type of high-temperature heat transfer and storage medium, have broad application prospects in high-temperature hydrogen production, nuclear reactors, solar thermal power generation, nuclear fuel reprocessing, fuel cells and other energy fields. However, due to the corrosive properties of fluoride molten salt and chloride molten salt to metal structural materials, their wide application in the above fields is limited. [0003] Commercial stainless steel and corrosion-resistant alloys are ASME standard engineering materials, widely used in nuclear energy, thermal power, aviation, aerospace and other high-temperature fields, especially stainless steel has been widely used due to its price advantage. Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/00C23F15/00
Inventor 孙华俞国军艾华刘华剑谢雷东侯惠奇
Owner 上海联和日环能源科技有限公司