Degreasing agent for permanent magnet material

Abstract

The invention relates to a degreasing agent for a permanent magnet material. The water-soluble degreasing agent comprises alkaline materials, a cleaning auxiliary agent and a surface active agent, wherein the alkaline materials are selected from at least two of sodium hydroxide, potassium hydroxide, sodium carbonate, sodium hydrogen carbonate, trisodium phosphate or sodium pyrophosphate; the cleaning auxiliary agent is selected from at least one of organic polybasic phosphonic cleaning auxiliary agents, or a mixture of at least one of the organic polybasic phosphonic cleaning auxiliary agents and at least one of inorganic phosphate cleaning auxiliary agents; and the surface active agent is a low-foam non-ionic surface active agent. According to the invention, the degreasing agent provided by the invention has good wettability, permeability and emulsibility, high degreasing speed, higher grease dirt capacity and long service life, and can prevent grease dirt from being adsorbed again; and meanwhile, by using the non-ionic surface active agent, the foam is little, the washing performance is superior, the water can be softened, and the corrosion of the permanent magnet material in the degreasing agent can be avoided.

Description

technical field [0001] The invention relates to a degreasing agent, in particular to a degreasing agent for permanent magnet materials, and belongs to the technical field of material surface treatment. Background technique [0002] In recent years, the application and development of NdFeB permanent magnet materials is very rapid, and whether NdFeB permanent magnet materials can be effectively protected is one of the key technologies related to the promotion and application of NdFeB permanent magnet materials. NdFeB permanent magnet materials are mainly prepared from rare earth metals such as neodymium, iron and boron through powder metallurgy process. As the strongest magnetic material at present, it has been widely used in electroplating devices, machinery, medical treatment, automobiles and other fields, and its application prospects are very broad. [0003] The premise of the wide application of NdFeB permanent magnet materials is to solve the anti-corrosion problem of N...

AI Technical Summary

Problems solved by technology

Incomplete degreasing and oil removal will have a great negative impact on the anti-corrosion of NdFeB permanent magnet materials

[0006] The existing degreasers are mainly researched and prepared for iron and steel materials or metals or alloys such as zinc and copper. The degreasers that can achieve better results on the surface of these materials often cannot achieve better results when used on the surface of NdFeB permanent magnet materials. Effect

This is because: the surface of NdFeB permanent magnet material is loose and porous, the oil in the gap is not easy to remove, and its corrosion resistance is poor. The commonly used strong alkali can easily cause corrosion of the material matrix and affect its performance.

[0007] For example, the patent with the publication number CN1056133 discloses the use of 40% to 80% sodium hydroxide for degreasing and degreasing. Corrosive

In addition, if the alkalinity of the alkaline solution used is too weak, the problem of incomplete degreasing and oil removal will occur

Some of the above patents still use sodium silicate in the process of degreasing and degreasing. Sodium silicate can effectively improve the effect of degreasing and degreasing, but in the subsequent pickling process, sodium silicate will adhere to the NdFeB permanent In the pores of magnetic materials, it affects the surface treatment effect of NdFeB permanent magnet materials

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