What kind of Magnets for dive canister light?

[m.pille.led]

Hi guys,
I need some help from you.
I need a magnet for my HALLSW from taskled.

Does any one have na idea what magnets are good for torches? They schouldn`t corode in salt water
I know that Samarium cobalt is a good choice,
does anyone know if the neodyme will corode?

Thank you very much
Regards
Mark

 

[DIWdiver]

Samarium cobalt. Hands down. Brittle, but strong and highly corrosion resistant.

Neodemium will corrode, even if it's nickel plated (ask me how I know) and it expands when it does, so if it's in a hole you'll never get it out.

 

[m.pille.led]

Hi
Ok thank you! I gess I`ll be going for the Samarium cobalto
What about if I silicone the neodemium magnet all around with a high quality marine "Sikaflex" , so it has no contact with the water
Or even do the same with the Samarium cobalt to ensure no corrosion?
Thanks
Mark

 

[DIWdiver]

If you trust the silicone, go for it. I wouldn't. It's not necessary with samarium cobalt.

 

[lucca brassi]

plastic magnets ( injection moulded magnets ) - very strong , resistant to chemicals ,( i did not direct test sample to slat water ) but that depend on and ratio between plastic and 'metal' powder in sample.

(PS: my company mould them and magnetize them , but i don't know if we have something for direct use in something like scuba switch)

 

[Rider57]

How about plasti dipping them?

 

[m.pille.led]

Yes
thats kind of what I`m planing to do, I`m thinking on using neodemium magnets covered with some good quality marine grade "sikaflex",
this stuff sticks like hell and stays flexible, I even use it somethimes to fix my wetsuit.
I would really prefer to use Samarium Cobalt, but I do not find it in the shape I need it
Regards

 

[landries]

https://www.hkcm.de
here you can find a lot off samarium cobalt magnets

 

[DIWdiver]

What shape do you need?

 

[m.pille.led]

Hi, sorry for the late answer.
I bought round magnets with a holle. so I can fix them better,
About the planed size I have no concrete idea yet.... I`m still triying to find the best option
Regards