How to prevent hydrogen embrittlement in SmCo magnet?

The question is there any treatment possible to address the atomic hydrogen? My suggestion is to try safe non-toxic laughing gas based on the suggestive chemistry. Experimentation with various means of possible application may prove somewhat successful (or not). To be honest, I have not rule out, in my expectations, even if the extraction is successful, whether the brittleness is eliminated or even may worst. Trying may suggest other paths or provide a definitive answer (including none).More

The question is how easily N2O gets to atomic hydrogen ( or alternative reactive hydrogen forms ) within the alloy.More

OK, it is not hydrogen gas per se, but an embedded hydrogen atom. The latter chemically behaves as an mono-atomic hydrogen radical (where .H <-> H+ + e-). It (namely, .H) will, and per a source does, convert PbS, for example, to Pb and H2S. So, think of .H as operationally a (H+, e-) pair. Your suggested method implies less contact than, for example, a high pressure N2O treatment or soaking in a solvent with a large amount of dissolved N2O. As such, I would expect your process to be much less effective.More

If you want to be more scientific, look up the hydrogen diffusivity in various polymers (before still using cling film).More

See my Hchemisorbed provided comment above for a better understanding on what is occurring,More