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Salty spray rusty resistant limited time on different surface coating

Sintered neodymium iron boron magnets are widely used in various industries due to their high magnetic strength and cost-effectiveness. To enhance their performance and durability, different coating materials can be applied on the surface of the magnets. In this article, we will discuss the corrosion resistance of neodymium iron boron magnets with different coatings through salt spray testing.

Salt spray testing is a common way of assessing the corrosion resistance of materials. In this test, the samples are exposed to a salt spray in a controlled environment to simulate harsh environmental conditions. The time for which the sample can resist the corrosion is measured and compared with other samples.

The following are the results of salt spray testing for neodymium iron boron magnets with different coatings:

1. Nickel-plated magnets: Nickel plating is a common coating for neodymium iron boron magnets. In salt spray testing, nickel-plated magnets can resist corrosion for up to 48 hours.

2. Epoxy-coated magnets: Epoxy coating provides a protective layer over the magnet surface. Epoxy-coated magnets can resist corrosion for up to 72 hours in salt spray testing.

3. Zinc-coated magnets: Zinc coating is a cost-effective way of protecting the magnet surface from corrosion. In salt spray testing, zinc-coated magnets can resist corrosion for up to 120 hours.

4. Gold-plated magnets: Gold plating provides not only a decorative finish but also a protective layer over the magnet surface. In salt spray testing, gold-plated magnets can resist corrosion for up to 240 hours.

5. Black nickel-plated magnets: Black nickel plating provides a unique appearance and a protective layer over the magnet surface. In salt spray testing, black nickel-plated magnets can resist corrosion for up to 360 hours.

In conclusion, neodymium iron boron magnets with different coatings have different levels of corrosion resistance in salt spray testing. The choice of coating material should be based on the specific application requirements and the expected environmental conditions.

Zhejiang Zhongke Magnetic Industry Co.,Ltd. could make following surface coating,if you had any other special requirement,also could let us know.

Type Of Coating		Thickness	Exterior	Corrosion Resistance					Remark
Type Of Coating		Thickness	Exterior	PCT	Salt Spray	Humidity and Temperature	Acid/Alkali	Oil	Remark
Zn(White Zn)	√	≥5μm	Blue white	——	★★	★★★	——	★
Zn(Color-plated Zn)	√	≥5μm	Iridescent	——	★★★	★★★★	——	★
Ni+Cu+Ni	√	≥15μm	Silver White	★★★	★★★★	★★★★★	★★★	★★★
Ni+Cu+Ni+Sn		≥15μm	Silver White	★★★★	★★★★	★★★★★	——	——	Excellent Eelding Performance
Chemic Ni	√	≥5μm	Silver White	★★★★	★★★★★	★★★★★	★★★	★★★
Epoxy	√	≥12μm	Black or Gray	★★★	★★★★★	★★★★★	★★★★★	★★★★	Poor Wear Resistance
Passivated	√	≤2μm	Black or Gray	——	——	★★★	——	★★★
Al		≥3μm	Silver Gray	★★★★	★★★	★★★★	——	★★★	High Binding Force
Al+Epoxy		≥15μm	Black or Gray	★★★★★	★★★★★	★★★★★	★★★★★	★★★★★	Poor Wear Resistance
Zn+Al		≥10μm	Silver White or Silver Gray	★★★★★	★★★★★	★★★★★	——	★★★★★
Everluber		≥5μm	Golden	★★★★	★★★★	★★★★★	★★★★★	★★★★
Teflon		≥5μm	Black	★★	★★★	★★★★★	★★★★★	★★★	Good Wear Resistance