"5 major methods" teaches you to choose the right coating for NdFeB magnets
Time:04/23/2019
The most commonly used coatings for NdFeB magnets are galvanized and nickel plated, which is the gold and silver we see. Many friends know that magnets need electroplating, but they don’t know the difference between different coatings.
In fact, NdFeB magnets are galvanized and nickel plated in the appearance, rust, service life and so on, there are obvious differences:
First, the difference in polishing
Nickel plating is superior to galvanizing on polished surfaces and is brighter in appearance. Nickel plating is generally required for products with high appearance requirements. Export products are basically nickel plated. Some magnets are not exposed, and the requirements for the appearance of the product are relatively low. Generally, galvanizing is sufficient.
Second, the rust difference
After the nickel-plated surface treatment, its corrosion resistance is higher, up to 96H salt spray does not rust, and galvanizing can only achieve 48H salt spray without rust.
Third, the hardness difference
Nickel plating is also higher than galvanizing. In the process of use, collisions and the like can be avoided to a great extent, so as to avoid the occurrence of cornering and chipping of the NdFeB magnet.
Fourth, the difference in service life
Compared with nickel plating, galvanizing has different corrosion resistance due to different surface coatings. Its service life is lower than that of nickel plating. The main reason is that the surface coating is easy to fall off after a long time, causing the magnet to oxidize and affect the magnetic force.
Five, the price difference
In this respect, galvanizing is extremely advantageous, and the price ranges from low to high, such as galvanizing, nickel plating, and epoxy resin. The quality and artificial difference of materials are also the determining factors. Conventional galvanizing nickel plating is barrel plating. Nickel plating is a method of electroplating a metal or some non-metal by electrolysis or chemical method. Nickel plating
The electroplating of NdFeB magnets is to add a protective layer on the surface to improve the appearance, corrosion resistance, rust prevention, surface strength and service life.
