Sezvo mabhureki rotor akagadzirwa nesimbi, anongoita ngura uye kana akaiswa kune zvicherwa zvakaita semunyu, iyo ngura (oxidization) inoita kukurumidza.Izvi zvinokusiya uine rotor yakashata kwazvo.
Sezvineiwo, makambani akatanga kutarisa nzira dzekudzikisa ngura yemarotor.Imwe nzira yaive yekuisa Geomet coating kudzivirira ngura.