Sm2Co17 in water
Sm2Co17 in water
(OP)
We have several questions about Sm2Co17 material.
1 How is its anti-corrosion capacity in water condition. how long will the magnet be corroded?
2 Is it necessary to coat the magnet? If yes, what is the best coating?
3 How about SmCo5, comparing with Sm2Co17.Because SmCo5 dont contain Fe, will it be better?
We are using this magnet in magnetron sputter, so the magnet is exposed to water continuously.
Thanks for any information.
1 How is its anti-corrosion capacity in water condition. how long will the magnet be corroded?
2 Is it necessary to coat the magnet? If yes, what is the best coating?
3 How about SmCo5, comparing with Sm2Co17.Because SmCo5 dont contain Fe, will it be better?
We are using this magnet in magnetron sputter, so the magnet is exposed to water continuously.
Thanks for any information.





RE: Sm2Co17 in water
http://en.wikipedia.org/wiki/Parylene
RE: Sm2Co17 in water
RE: Sm2Co17 in water
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RE: Sm2Co17 in water
http://www.mceproducts.com/
RE: Sm2Co17 in water
RE: Sm2Co17 in water
I was suggeting coatings based on the theory that if corrosion is peceived to be a potential problem, mitigate the problem from the begining.
Remember that corrosion generally proceeds faster at higher temperatures and that water usually has disolved oxygen and minerals that can accelerate corrosion.
RE: Sm2Co17 in water
Watch out, with any coating you will need to be able to test for bond, Hydrogen damage (with Ni), and holidays,
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Plymouth Tube
RE: Sm2Co17 in water
RE: Sm2Co17 in water
Leslie2000: Ask your supplier(s) what coatings they offer for SmCo and start testing.
RE: Sm2Co17 in water
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Plymouth Tube
RE: Sm2Co17 in water
1) Ferrite, 2) Alnico, 3) FeCrCo, 4) SmCo, 5) NdFeB
Corrosion in water is due to: 1) galvanic couple between dissimular phases (as pointed out by EdStainless) and 2) oxidation of the metals. although dissolved oxygen is minimized above about 150 ºF, it should still be a concern.
The common coatings for metallic permanent magnets are: 1) epoxy (spray), 2) E-coat (dip epoxy), 3) Parylene, 4) Nickel plate (electrolytic), 5) Aluminum IVD, 6) Nickel plate (electroless), 7) Hybrid coatings such as conversion coating plus expoxy. There are numerous others in limited use.
For SmCo at elevated temperature, you should consider electrolytic nickel plating. If there are no acids or salts in the water, this should serve you well. Be aware that there are only a limited number of companies that understand how to plate rare earth magnets (SmCo and NdFeB).