... oxygen but is prone to corrosion in salt and acidic conditions. Epoxy single layer coating does not protect magnets against moisture ... oxygen but protect magnets from corrosion in salt and acidic conditions. The combination of Epoxy and Nickel+Copper+Nickel coating is ... the best solution against both corrosion in salt, acidic conditions and moisture, oxygen. General Features: Grades:N33,N35,N38,N40 ...