METHOD FOR IMPROVING PERFORMANCE OF MODIFICATION LAYER OF MATERIAL SURFACE AND APPLICATION THEREOF

摘要

Provided is a method for improving performance of a modification layer of a material surface. The method comprises: coating an inorganic zinc-silicon rich sol-gel on a material surface to be processed to form a priming coating, and coating a zinc chromate coating liquid on the priming coating to form a zinc chromate membrane. The inorganic zinc-silicon rich sol-gel comprises a soluble alkali metal silicate material, an inorganic gel and ultrafine zinc powder, and the zinc chromate coating liquid comprises sheet-like zinc powder, aluminum powder, a chromic anhydride, a boronic acid and a surfactant, etc. Also provided is an application of the method in an aspect of magnet protection to obtain a permanent magnet and a device comprising the same. The method has a simple process, easy control, low costs, is safe and environmentally friendly, and suitable for processing various NdFeB permanent magnets.