Influence of surface condition on the magnetic properties of Fe-3% Si alloy

1. With the use of hydrated magnesium oxide to obtain the magnesium silicate coating on Fe-3% Si alloy the negative influence of the coating on the magnetic properties of this alloy related to the introduction of oxides into the surface of the metal exceeds the positive influence caused by the occurrence of tensile stresses. 2. The magnetic properties of Fe-3% Si alloy given a high temperature anneal without coatings are higher than of the alloy annealed with a coating formed from hydrated magnesium oxide. 3. A decrease in the negative influence of the primer coat may be obtained by selection of an original material for the coating which provides preferential formation of primer coats at temperatures exceeding the temperature of secondary recrystallization of the metal. A decrease in the moisture content in the original material, magnesium oxide, causes an increase in the temperature of formation of the primer coat of magnesium silicate coatings.