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

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 10weight 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...

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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.

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