The effect of Hydrogen peroxide & Sodium hydroxide on SmCo

[cermag]

I have been trying to find what would happen to Samarium Cobalt compound when introduced to Liquid Hydrogen peroxide & Liquid Sodium hydroxide at elevated temperatures up to 200 deg C. Can anyone suggest what may happen to the compound "Physically" not "magnetically"

 

[MagMike]

Which type of SmCo: 1:5 or 2:17?

The 2:17 contains iron and I've found that it is the iron component that tends to corrode, although at a much smaller rate compared to NdFeB.

The 1:5 contains little to no iron and I've found it to be fairly corrosion resistant.

Even so, that environment you describe sounds pretty harsh. I'd recommend assume the worst and protect the magnet from exposure.

 

[cermag]

Thanks MagMike. The grade would probably be 2:17 although not finalised yet. There may be an option to pot the magnet. What coating would you suggest?

 

[EdStainless]

200C, what H2O2 concentration?
This is a highly oxidizing environment. The thought of ignition comes to mind, though catastrophic oxidation is more likely.
You need a good barrier coating that is not permiable by oxygen. Maybe a multy layer epoxy, or Paralene.

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[kenvlach]

Unusual conditions.

The hydrogen peroxide will likely decomposes before it reaches 200 C, catalyzed by and perhaps oxidizing the metal surface. See

http://www.h2o2.com/

The melting point of sodium hydroxide is 323 C, so it's unlikely that liquid hydrogen peroxide and liquid sodium hydroxide can co-exist.

If aqueous solution, give concentrations.