According to the present invention, powder coating compositions comprise
one or more than one thermoplastic or thermosetting polymer or resin and
one or more than one finely divided magnetic material, such as a
ferromagnetic material. Preferred magnetic materials include
Ni.sub.1-xZn.sub.xFe.sub.2O.sub.4 compounds, wherein
0.4.ltoreq.X.ltoreq.0.75, piezoelectric compounds, ferrimagnetic
.delta.FeOOH, Fe--Ni--B, Cu.sub.2MnIn, transparent polymer-Cobalt oxide
nanocomposites and soft ferrites. In addition, the present invention
provides methods of making powder coatings on a substrate comprising
applying to a substrate a resinous powder coating composition comprising
one or more than one magnetic material to form a powder coating layer,
followed by induction heating to melt the applied powder coating to form
a coating film and, optionally, to cure the powder coating. The powder
coatings remain at a pre-selected temperature equal to or less than the
Curie temperature (T.sub.C) of the one or more than one finely divided
magnetic material during induction heating of the powder coating without
directly heating the substrate. Powder coatings on metal parts may also
be induction heat cured.