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A method for inhibiting galvanic corrosion of molten salt system

A galvanic corrosion and system technology, applied in the field of inhibiting galvanic corrosion in molten salt systems, can solve problems such as the difficulty of realizing the protective layer, and achieve the effect of reducing the potential difference and inhibiting galvanic corrosion

Active Publication Date: 2021-09-24
SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Traditional methods of inhibiting galvanic corrosion, such as increasing insulation measures, reducing the area of ​​metals with higher potentials, and increasing protective layers, are difficult to achieve in complex high-temperature molten salt systems

Method used

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  • A method for inhibiting galvanic corrosion of molten salt system
  • A method for inhibiting galvanic corrosion of molten salt system
  • A method for inhibiting galvanic corrosion of molten salt system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Add 680ppmCrF to FLiNaK molten salt system 3 and 720ppmCrF 2 , recorded as FLiNaK-680ppmCrF 3 -720ppmCrF 2 .

[0051] Using the above method to make NiF 2 / Ni is the reference electrode, and graphite is the counter electrode. 316L stainless steel, GH3535 nickel-based alloy and silver were tested at 600°C in FLiNaK-680ppmCrF 3 -720ppmCrF 2 The anodic polarization curve in (where silver is used as the working electrode for comparison), such as Figure 7 shown. It can be seen from the figure that the self-corrosion potentials of the three metals in the molten salt system tend to be the same, about -0.724±0.001V, and the potential difference is reduced to within a few millivolts, which can greatly reduce the occurrence of galvanic corrosion between different metals. possible.

[0052] Using the above method also tested 316L stainless steel and GH3535 nickel-based alloy at 600 °C in FLiNaK-680ppmCrF 3 -720ppmCrF 2 Galvanic current in molten salt, so as to obtain 31...

Embodiment 2

[0055] To further elucidate the formation of redox buffer molten salts and their effect on the self-corrosion potential of different metallic materials,

[0056] In this example, 1000ppmCrF is added to the FLiNaK molten salt system 3 , recorded as FLiNaK-1000ppmCrF 3 , in the FLiNaK-1000ppmCrF 3 Add 50ppmCrF to 2 , 100ppmCrF 2 , 400ppmCrF 2 , 600ppmCrF 2 , 800ppmCrF 2 , 1000ppmCrF 2 , 1200ppmCrF 2 and 1500ppmCrF 2 , respectively recorded as FLiNaK-1000ppmCrF 3 -50ppmCrF 2 , FLiNaK-1000ppmCrF 3 -100ppmCrF 2 , FLiNaK-1000ppmCrF 3 -400ppmCrF 2 , FLiNaK-1000ppmCrF 3 -600ppmCrF 2 , FLiNaK-1000ppmCrF 3 -800ppmCrF 2 , FLiNaK-1000ppmCrF 3 -1000ppmCrF 2 , FLiNaK-1000ppmCrF 3 -1200ppmCrF 2 and FLiNaK-1000ppmCrF 3 -1500ppmCrF 2 .

[0057] Using the above method to NiF 2 / Ni is the reference electrode, and graphite is the counter electrode. The anodic polarization curves of 316L stainless steel, GH3535 nickel-based alloy and silver in the above molten salt system...

Embodiment 3

[0059] In order to illustrate that the method of the present invention is applicable to the suppression of galvanic corrosion between various molten salts and various materials, different redox ion pairs were added to different molten salts in this example, and the above method was also used to test The galvanic corrosion effect coefficients of different materials in these systems are shown in Table 1.

[0060] Table 1

[0061]

[0062] Among the molten salts in Table 1, 46.5LiF-11.5NaF-42KF means that the molten salt is a mixture of LiF, NaF and KF, wherein the molar ratio of LiF, NaF and KF is 46.5:11.5:42. 66.7LiF-33.3BeF 2 Indicates that the molten salt is a mixture of LiF and BeF, wherein the molar ratio of LiF and BeF is 66.7:33.3.33NaCl-21.6KCl-45.4MgCl 2 Indicates that the molten salt is NaCl, KCl and MgCl 2 A mixture of which, NaCl, KCl and MgCl 2 The molar ratio is 33:21.6:45.4. 33NaCl-21.6KCl-45.4CaCl 2 Indicates that the molten salt is NaCl, KCl and MgCl 2 ...

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Abstract

The invention discloses a method for inhibiting galvanic corrosion of a molten salt system, which comprises the following steps: mixing the molten salt and redox ion pairs; the redox ion pairs are selected from Eu 3+ / Eu 2+ 、Ce 4+ / C 3+ 、Cr 3+ / Cr 2+ 、Zr 4+ / Zr 2+ , Fe 3+ / Fe 2+ or U 4+ / U 3+ . By introducing redox ion pairs into the molten salt system, the potential difference between different metal materials or between metal materials and graphite materials in the molten salt system is reduced or even eliminated, thereby suppressing the potential difference between different metal materials or between metal materials and graphite materials Galvanic corrosion.

Description

technical field [0001] The invention relates to a method for inhibiting galvanic corrosion of a molten salt system. Background technique [0002] Due to its excellent physical and chemical properties, molten salt is being paid more and more attention by governments and scientific research institutions of various countries. Molten salt reactor research and development projects are being stepped up in China, the United States, Japan and other countries. In addition, the research and development of new energy systems based on molten salt solar energy collection and heat storage are in full swing. One of the key technologies for the application of molten salt in the above-mentioned fields of nuclear energy or new energy is to solve the problem of compatibility between molten salt and structural materials. High-temperature nickel-based alloys have good corrosion resistance to molten salts including fluorine salts and chloride salts, but they are expensive, difficult to process ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F15/00
CPCC23F15/00
Inventor 左勇秦越强申淼王建强
Owner SHANGHAI INST OF APPLIED PHYSICS - CHINESE ACAD OF SCI
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