Some Nouns That Magnetic Material Practitioners Must Know(2)

5. Surface Treatment -- Electrophoresis

Electrophoretic coating is to immerse the parts in the water-soluble electrophoretic tank, in which the positive electrode and the negative electrode are inserted at the same time, and the direct current is reduced at the two poles, so as to produce an electrochemical reaction, so that the water-soluble coating (usually polymer resin, such as epoxy resin) is uniformly deposited on the parts, forming an anti-corrosion coating composed of resin particles, or forming an anti-corrosion layer of polymer. Electrophoretic coating not only has a good bonding force with porous magnet surface, but also has excellent corrosion resistance to salt spray, acid, alkali, etc., with excellent corrosion resistance, but poor moisture and heat resistance.

6. Surface treatment -- Parylene

Parylene is a protective polymer material, its Chinese name is polyp-xylene, perylene which can be vapour-deposited in a vacuum. The good penetration of the active molecule of Parylene forms a transparent insulating coating of uniform thickness, without pinholes, inside and around the bottom of the component, providing a complete protective coating of high quality. Resist acid and base, salt spray, mold and all kinds of corrosive gas. Combined with its unique preparation process and excellent properties, Parylene is capable of coating small and ultra-small magnetic materials without any weak points, which can be immersed in hydrochloric acid for more than 10 days without corrosion. At present, many small and ultra-small magnetic materials in the world use Parylene as insulation and protective coating.

7. Dimensional Tolerance

Dimensional tolerance, referred to as tolerance, refers to the allowable variation in the size of parts during machining. A certain size difference of magnetic material is allowed, and the absolute value of the difference between the maximum limit size of tolerance and the minimum limit size, or the difference between the allowable upper deviation and the allowable lower deviation.