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Magnet coating type;

Coating type

Color

Plating  thickness

Salt spray  testing

Temp&Humi

PCT/Hast

Zn

Blue

5-15μm

12 Hour

/

/

Nickel

Silver

10-30μm

16/24 Hour

300 Hour

24Hour

Epoxy

Black/Gray

10-30μm

48 Hour

72 Hour

48 Hour

Ni+Au

sliver

10-30μm

24 Hour

500 Hour

48 Hour

Ni+Ag

gold

10-30μm

24 Hour

72 Hour

48 Hour

NiCu+Epoxy

Black

20-40

72 Hour

500 Hour

48 Hour

Ni+Parylene(Teflon)

Black/yellow

15-25μm

72 Hour

500 Hour

24 hours

Everlube

yellow

8-18μm

48 Hour

240 Hour

72 Hour

NiCU+Everlube

yellow

10-20μm

72 Hour

500 Hour

72 Hour

Nickel: It looks like the color of stainless steel, the surface is difficult to be oxidized when left in the air, and the appearance is good, and the gloss is good. The electroplating can pass the salt spray test for 12 to 72 hours. The disadvantage is that it cannot be used for bonding with some glue, which will cause the coating to fall off. 


Copper: It mostly appears in the hardware industry. Few people use it in the NdFeB industry. Its appearance is yellow and it is rarely used. 


Chromium: Chromium electroplating industry is also relatively rare, and its electroplating cost is very high, and the average company cannot accept it. But its ability to release corrosion is very strong, and it is difficult to react with other substances. Mainly used in places with strong pH. This is generally rarely chosen. 

Neodymium magnet coating

Black zinc: According to customer requirements, the surface of the product is treated to black. In terms of electroplating process, a black protective film is added through chemical treatment on the basis of galvanizing. This film can also protect the product and increase The salt spray time prolongs the oxidation time. But its surface is easily scratched and loses its protective effect. Few people are used now, and most of them are replaced by resin. 


Gilded: The yellow gold jewelry of some stalls we saw on the street was mostly gilded or copper. Gold plating makes the product look very beautiful like gold. It is generally used in the jewelry industry. Our products can also be gold-plated for magnetic jewelry. 


Epoxy coating: After the product is nickel-plated, a layer of resin paint is added to the outside. This industry has only had a market in the past two years, and its development speed is very fast. Nowadays, many people use various electroplating products. Its biggest advantage is You can do the color you want.


The coating of neodymium iron boron strong magnet is generally plated with nickel, copper, chromium, gold, black zinc, blue and white zinc, epoxy resin, etc. The color of the magnet surface varies depending on the electroplating, and the storage time also varies.


How to choose neodymium magnet coating;

The appropriate coating should be selected according to the unused use environment. The coatings of different manufacturers are different. The main reason is the length of the chamfering and the electroplating time. Without knowing the magnet electroplating, how should we judge the quality of the coating In fact, one of the easiest and quickest way to look at the coating is to look at the coating. The brighter the coating, the better the quality. So when choosing to order magnets, try to choose a well-known company in the industry to ensure the quality of the coating.


Go to the product column of Neodymium Magnets to see more.


Related magnet coating (Plating) articles;

Advantages and disadvantages of nickel coating on neodymium magnets

Will the magnet coating (plating) affect the magnetic strength of the magnet?

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