How do you secure your Neodymium Disc Magnets so it lasts?

[newreefguyy]

I'm trying to put some rocks at the back and make it look like it's floating and ik this magnet rusts or degrades not really sure but I don't really know an alternative where I have the leisure of moving it.


Saw this and just wanna ask around if anyone has used it and how did you do so. https://a.co/d/eAnPetw

 

[ForTheLoveOfCoral21]

When introducing neodymium magnets to a saltwater environment, it's critical to take precautions to prevent corrosion. The salt and moisture in this environment can rapidly degrade the magnet's performance, potentially leaching harmful elements into the tank and harming the fish.

Here are a few steps to help protect your neodymium disc magnets:

Epoxy Resin: Coat the magnet in a thick layer of marine-grade epoxy resin. This waterproof material forms a solid barrier between the magnet and the saltwater, helping to prevent corrosion. Make sure that the epoxy resin is fully cured before introducing it to the tank.

Heat Shrink Tubing: After the epoxy resin has cured, you might also consider using heat shrink tubing for an added layer of protection. This tubing can be heated to shrink tightly around the magnet, offering additional resistance to the water.

Silicone Sealant: A silicone sealant can also be used to encase the magnet. Silicone is well-known for its waterproof properties and can be a good option for this type of application. The silicone should be completely dry and cured before the magnet is placed in the saltwater tank.

PVC Encasing: You could consider encasing the magnet in a PVC pipe. This can be done by selecting a pipe with a diameter slightly larger than the magnet, inserting the magnet, and then sealing both ends with a PVC cap. Use PVC cement to ensure a watertight seal.

 

[coreytrv]

When introducing neodymium magnets to a saltwater environment, it's critical to take precautions to prevent corrosion. The salt and moisture in this environment can rapidly degrade the magnet's performance, potentially leaching harmful elements into the tank and harming the fish.

Here are a few steps to help protect your neodymium disc magnets:

Epoxy Resin: Coat the magnet in a thick layer of marine-grade epoxy resin. This waterproof material forms a solid barrier between the magnet and the saltwater, helping to prevent corrosion. Make sure that the epoxy resin is fully cured before introducing it to the tank.

Heat Shrink Tubing: After the epoxy resin has cured, you might also consider using heat shrink tubing for an added layer of protection. This tubing can be heated to shrink tightly around the magnet, offering additional resistance to the water.

Silicone Sealant: A silicone sealant can also be used to encase the magnet. Silicone is well-known for its waterproof properties and can be a good option for this type of application. The silicone should be completely dry and cured before the magnet is placed in the saltwater tank.

PVC Encasing: You could consider encasing the magnet in a PVC pipe. This can be done by selecting a pipe with a diameter slightly larger than the magnet, inserting the magnet, and then sealing both ends with a PVC cap. Use PVC cement to ensure a watertight seal.

Have been doing a search on this. What would be the best way to encase a circular disk magnet in epoxy resin?

Most of the articles I found have talked about embedding it in a mold.

Here's a picture of the magnet I'm trying to encase:

 

[coreytrv]

Bumping this as well...read the linked post above, great suggestions on epoxy and materials...but I have no idea how to actually encase this magnet in something that will make it impervious to saltwater..

Make a mold and dunk it, paint it on with something, spray, etc...?

 

[JTP424]

I buy mine pre-coated. Use various sizes all over my tanks, never had one leak/break open.
https://www.kjmagnetics.com/products/plastic-and-rubber-coated-magnets?pg=3They don't have super massive ones, but some have some decent pull strength.

 

[coreytrv]

I buy mine pre-coated. Use various sizes all over my tanks, never had one leak/break open.
https://www.kjmagnetics.com/products/plastic-and-rubber-coated-magnets?pg=3They don't have super massive ones, but some have some decent pull strength.

Saw that, unfortunately the ones I need are over 200 lbs pull strength, and don't come pre-sealed in epoxy.

Looking for ways to encase this magnet in something that will make it impervious to saltwater.

 

[JTP424]

Might be able to find an acrylic shop that could make an enclosure for you. Going to be pricey, but will be clean and hold up.

 

[coreytrv]

Might be able to find an acrylic shop that could make an enclosure for you. Going to be pricey, but will be clean and hold up.

That's a good idea. Could even do Black to match the back of the tank, thanks!

 

[JTP424]

If you could figure out how to build an enclosure in layers/slices, i.e. kind of how they do those onion volcanoes at hibachi places, you could send files to Ponoko and glue it up yourself with some weldon etc.
I used them to cut some tiny frag racks for me a while back.

https://www.ponoko.com/

 

[coreytrv]

If you could figure out how to build an enclosure in layers/slices, i.e. kind of how they do those onion volcanoes at hibachi places, you could send files to Ponoko and glue it up yourself with some weldon etc.
I used them to cut some tiny frag racks for me a while back.

https://www.ponoko.com/

Depending on how much Tap Plastics wants, maybe I buy a 3d printer, and print a mold, then fill that with resin.

 

[mfinn]

Back when magnet frag racks weren't available ( suction cups only) or powerheads ( except Tunze ) I decided to try and make saltwater safe magnet mount frag racks.
After trying several products I found Castin Craft Polyester Resin to last.
My biggest neodymium magnets used were only 1-1/2" x 1", but mostly just 1" x 3/8".
I found that you needed to use a dye in the resin. UV really took a toll on clear resin.
I would use a casting mold and pour in a 1/4" base. Wait a 20 minutes or so and place the magnet in. The first pour had to be still soft so it would bond with the top and final pour.
This process sealed the magnets very well. I have still have a couple around after 25+ years. Most of the magnets have broken away from the black eggcrate, but they are still sealed.