You could make them quite pretty.
Do ceramic magnets rust.
The only sure conclusion is that corrosion is coming though it is hard to predict when.
Ceramic magnets resist demagnetization better than other magnets and are an economical choice.
They rust very easily and extra steps must be taken to protect them from corrosion.
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A case protects the magnetic material.
Some magnets are in a plastic base other s feel a bit more stone like because they ve been moulded in a ceramic.
Regular neodymium magnets are very susceptible to rust which is why we do not recommend them for exterior applications.
Ceramic magnets bonding methods.
The last magnet to rust didn t start showing problems until after a month.
A thin film of magnet powder on the surface is common.
Variations in material condition will significantly reduce these ratings.
Because of their unrivalled resistance to corrosion ferrite magnets are very rarely coated but as ferrite is a dusty material some applications will require some surface treatment to avoid the dust.
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Ferrite magnets also known as ceramic magnets are made from iron oxide and as a result they simply do not corrode even when submerged in water.
The first magnet to fail showed a rust bubble after about 1 week.
In previous testing gold plated magnets lasted longer than nickel plated but that certainly wasn t true here.
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Please always ensure that bonding surfaces are clean and dry prior to bonding.
Alnico and ceramic magnets both resist corrosion naturally although they don t provide the same level of magnetic performance of rare earth samarium cobalt and neodymium magnets.
Ceramic magnets are often assembled into products using superglues such as loctite 325 or other epoxies.
Ceramic magnets do not need to be protected for surface rust.
Neodymium magnets are also very brittle and will crack under stress.
Unless there are some sort of iron filings on the surface that could rust i think you d be ok.
Do not use for lifting over people.
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They lose their magnetism if exposed to temperatures above 175 to 480 degrees fahrenheit depending on the exact alloy used.
Maximum pull ratings are based on direct contact with rust free and unpainted iron plate.
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Some grades of alnico magnets do contain traces of iron and therefore will display some light surface corrosion over time if exposed to water.
Neodymium magnets are relatively more expensive than ceramic magnets.
On the other hand water proof neodymium and ferrite magnets are ideally suited for that purpose.
I would paint the magnets with something like a clear lacquer to minimise the risk.
