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Inhibitor in aqueous heat exchange medium for La-Fe-Si series room temperature magnetic refrigeration materials

A technology of magnetic refrigeration materials and corrosion inhibitors, which is applied in the field of water-soluble corrosion inhibitors, can solve disadvantages and other problems, achieve the effects of improved corrosion inhibition effect, reduced addition amount, and reduced use cost

Active Publication Date: 2009-08-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the corrosion product is relatively loose, its deposition on the surface is not enough to effectively protect the substrate. Therefore, if no effective protection measures are taken, the corrosion will continue, which is obviously very unfavorable for practical applications.

Method used

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  • Inhibitor in aqueous heat exchange medium for La-Fe-Si series room temperature magnetic refrigeration materials
  • Inhibitor in aqueous heat exchange medium for La-Fe-Si series room temperature magnetic refrigeration materials

Examples

Experimental program
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Effect test

Embodiment 1

[0023] The base liquid is distilled water, add 2% (wt) sodium molybdate, 3.2% (wt) sodium nitrite, 0.44% (wt) disodium hydrogen phosphate, 0.5% (wt) sodium silicate, 0.05% (wt) zinc sulfate , 0.05% (wt) borate, 0.3% (wt) sodium carbonate, 2vol% triethanolamine, just stir evenly.

Embodiment 2

[0025] Base liquid is distilled water, add 5% (wt) sodium molybdate, 1.8% (wt) potassium dichromate, 1% (wt) sodium phosphate, 0.5% (wt) sodium silicate, 0.07% (wt) zinc sulfate, 1% (wt) sodium benzoate, 5vol% triethanolamine, just stir evenly.

Embodiment 3

[0027] Base liquid is distilled water, add 5wt% sodium nitrite, 1.6wt% potassium dichromate, 0.4wt% disodium hydrogen phosphate, 0.3wt% sodium silicate, 0.02wt% zinc sulfate, 1wt% sodium benzoate, 8vol% triethanolamine , stir evenly.

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Abstract

The invention relates to an inhibitor in an aqueous heat exchange medium for La-Fe-Si series room temperature magnetic refrigeration materials, which belongs to the field of functional materials and can significantly improve the corrosion resistance of the La-Fe-Si series room temperature magnetic refrigeration materials in an aqueous heat exchange fluid. The inhibitor consists of the following components in percentage by weight: 0.1 to 10 weight percent of molybdenate, 0 to 5 weight percent of dichromate, 0 to 8 weight percent of nitrite, 0.5 to 3 weight percent of orthophosphate, 0.05 to 2 weight percent of silicate, 0 to 1 weight percent of borate, 0 to 3 weight percent of sodium benzoate, 0 to 0.1 weight percent of zinc sulfate, 0 to 0.5 weight percent of sodium carbonate, and 0 to 10 weight percent of triethanolamine. The inhibitor has the characteristics of a small usage amount, simple using method and high corrosion inhibition efficiency, and can significantly improve the corrosion resistance of the magnetic refrigeration materials after being added into the aqueous heat exchange medium.

Description

technical field [0001] The invention belongs to the field of functional materials, and in particular provides a water-soluble corrosion inhibitor for La-Fe-Si series room temperature magnetic refrigeration materials, which can significantly improve the performance of La-Fe-Si series room temperature magnetic refrigeration materials in water-based heat exchange. Corrosion resistance in fluids. Background technique [0002] Room temperature magnetic refrigeration technology is a technology that uses the Magnetic Card Effect (Magneto-caloric Effect, MCE) of magnetic materials to achieve refrigeration. Since it does not use Freon and compressors, it has the advantages of small size, high reliability, high efficiency and energy saving, and no environmental pollution. , so it is recognized as a green refrigeration technology and has a very broad application prospect. [0003] After the American scientist Brown (J.Appl.Phys., 1976, 47(8): 3673) used the rare earth metal Gd as the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F11/18
Inventor 叶荣昌龙毅侯建
Owner UNIV OF SCI & TECH BEIJING
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