A method of removing nitriding salt bath slag by using the principle of magnetic adsorption

Abstract

The invention discloses a method for removing furnace slag in a nitriding salt bath by utilizing a magnetic adsorption principle. In the method, an additional magnet acts on the salt bath to adsorb the furnace slag. The principle of the method is that the Curie temperature of iron is higher than 700 DEG C, therefore, the ferromagnetism may exist within the working temperature range (500-600 DEG C) of the nitriding salt bath, however, a magnetic force is reduced because of being affected by a medium / high-temperature environment, and therefore, the magnetization effect can be guaranteed only if an additional magnetic field is provided. Most of components in the furnace slag in the nitriding salt bath are ferromagnetic substances, and therefore, the furnace slag can be adsorbed by guaranteeing a magnetic pole and the magnesium of the furnace slag near the magnetic pole by the external magnetic field. By using the method, coarse slag is removed, and meanwhile, fine slag having key influences to a salt bath nitriding process in the salt bath can also be removed, so that the effect of thoroughly removing the slag is achieved; and meanwhile, the production is not needed to be stopped when the slag is removed by using the method, so that the production efficiency is greatly increased.

Description

technical field [0001] The invention belongs to the technical field of salt bath nitriding, relates to a slag removal process in the field of salt bath nitriding, in particular to a method for removing slag in a nitriding salt bath by using the principle of magnetic adsorption. Background technique [0002] Salt bath nitriding process is a chemical heat treatment process, which provides active nitrogen atoms through cyanate ions in the salt bath, and makes them penetrate into the surface of iron base to form hard and dense iron nitrogen compounds, thereby greatly improving the quality of iron base. Wear resistance and corrosion resistance of the material. In the salt bath nitriding technology, how to ensure the cleanliness of the salt bath is the key to this technology, and the reliable and thorough slag removal process is the key process to ensure the cleanliness of the salt bath. [0003] The slag of the nitriding salt bath can be divided into coarse slag and fine slag ma...

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Problems solved by technology

[0007] The purpose of the present invention is to: aim at the problems of incomplete and inefficient removal of slag in the existing nitriding salt bath, the present invention provides a method for removing slag from the nitriding salt bath by using the principle of magnetic adsorption. The method uses an external magnet to act on the salt bath, absorbing coarse slag and fine slag at the same time, to achieve the purpose of complete slag removal, and also solve the problem of low efficiency caused by the interruption of production due to slag removal in the existing salt bath nitriding process

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