General Info of Parylene Coated Magnets:
Neodymium Magnets are usually poorly corrosion resistant and then will be milled the surface and finally will be coated with Nickel(Ni-Cu-Ni), Black Nickel, Zinc(Trivalent), Epoxy, Stannum, Gold, Silver or Parylene etc to resist rust. The parylene caoting is relatively new and it does well in anti-rust application.