salt spray test magnet

Salt spray test

Salt Spray Test

The salt spray test is one of the important tests for the performance of neodymium magnets, because neodymium magnets have the disadvantage of being easy to corrode and oxidize. Long-term exposure of neodymium magnets to salt water, salty air or harsh chemicals will accelerate corrosion.
Generally speaking, most factories can only provide salt neutral spray test for 72 hours. And we can provide neodymium magnets with 216 hours of salt spray. And our most frequently produced magnets can easily pass the 200 hour salt spray test.

The salt spray test has a great relationship with the coating, and different coatings have different corrosion resistance. And among many of the most commonly used coatings:

salt spray test magnet

Salt Spray Test 216 Hours (Neodymium Magnet)

Epoxy Salt Spray Test:
Advantages: good protection performance, relatively good price
Disadvantages: In the control of thickness, it is not as good as parylene

Parylene Salt Spray Test:
Advantages: the best protection performance, easy to control the thickness,
Disadvantages: Reduce sticker viscosity, easy to fall off from sticker, high price

There are currently three main mainstream salt spray tests, which are used to simulate different times.
Neutral salt spray test performed for 24 hours equates to approximately 1 year in a natural environment.
Acetic acid salt spray test performed for 24 hours equals 3 years in a natural environment.
Copper salt accelerated acetate spray test performed for 24 hours equals 8 years in a natural environment.
All of these types are accelerated tests to determine the corrosion resistance of paints and varnishes, metal products, lubricants, protective fluids and any other objects that will be used in harsh climatic conditions.

N52 neodymium magnets

N52 neodymium magnets

What are the Strongest N52 neodymium magnets? N52 neodymium magnets are produced by a patented process called sintering. It literally means to “heat and press together”. In the process, neodymium is heated to a temperature of 8,000 degrees Fahrenheit and pressed between two iron alloys. The alloy is held together with heat, pressure and anti-corrosion […]

neodymium magnet warning

Magnet Coating

Against the lack of Alternative magnet raw material

Magnets play an important role in modern technology: they are found in computer hard drives, magnetic separators, power generators and many other electronic components. The secret of the strongest magnets available today are often so-called rare earths . Metals such as neodymium and dysprosium have special electrical and magnetic properties – without them, many high-tech products would be unthinkable.

The problem is that these coveted raw materials are scarce and expensive, but demand is growing. Scientists are already predicting future bottlenecks for some of the rare earth metals. On the other hand, geopolitical aspects also play a role. As the main exporter of rare earths, China has an almost monopoly on certain materials and can control trade in them accordingly.

Alternatives for neodymium and dysprosium

For this reason, researchers are now looking for alternatives to neodymium and the like: could strong permanent magnets be created that make do with more readily available rare-earth or perhaps even contain no metal from this group at all? Thomas Lograsso from the Ames Laboratory of the US Department of Energy and his colleagues have now addressed this question – and initially focused on paramagnets. These materials are weakly attracted to magnetic fields but are not permanently magnetized.

“We can rehabilitate such systems, so to speak, and turn them into a magnet by adding certain materials,” explains Lograsso. “To do this, we start with alloys or compounds that have the right properties to be ferromagnetic at room temperature.” But which materials have the properties we are looking for?

Two promising candidates

To identify promising candidates, the scientists used a computational approach. In this way, they were able to predict the magnetic behavior of a variety of materials and also find out whether they are suitable for the development of solid magnets. “This approach led to the identification of some powerful magnets very quickly,” the team writes.

The calculations showed, among other things, that the paramagnetic cerium cobalt CeCo3 can be transformed into a ferromagnet by adding magnesium. And indeed: Subsequent experiments confirmed this, as Lograsso and his colleagues report. Another candidate identified in the analyzes is CeCo5. True, this material is already a strong ferromagnet. However, the calculations and experiments revealed that this property can be further optimized with the right amount of copper and iron.

“Economically and ecologically sensible”

With these additives, CeCo5 could one day even replace strong rare earth magnets such as neodymium and dysprosium, the researchers predict. The advantage of this: Strictly speaking, cerium also belongs to the class of rare earths. Unlike neodymium and the like, however, it is readily available and easy to obtain.

“Being able to replace rare earth metals, which are in high demand and in short supply, would make sense from both an economic and ecological point of view,” says Lograsso. “Although our modified cerium-cobalt compounds are not yet as powerful as the strongest rare earth magnets, they could still represent a valuable alternative for certain applications.”

In addition, he and his colleagues are already working on alternative magnets that are not based on cerium or other rare earth metals. Among other things, they are experimenting with cobalt to give the iron germanium Fe3Ge a strong magnetization. (American Chemical Society, 2019; Meeting)

Source: American Chemical SocietyApril 2, 2019


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