| 摘要 |
FIELD: metallurgy. ^ SUBSTANCE: invention relates to plating made of zinc and/or aluminium by means of submersion into molten electrolyte of strip made of high-strength steel with different alloying ingredients, particularly, Mn, Al, Si and/or Cr. Method including following stages: a) strip in deoxidising atmosphere with content H2 at least from 2% up to 8%, it is heated up to temperature from 650C up to 750C, at which alloying species are not diffuse yet and only in small quantity diffuse on surface, b) surface consisting of mainly from pure iron by means of strip's thermal treatment of duration from 1 up to 10 sec at temperature from 650C up to 750C in built in to pusher-type furnace reaction chamber with oxidising atmosphere with content O2 from 0.01% up to 1%, transform into layer of ferric oxide, c) then strip in deoxidising atmosphere with content H2 from 2% up to 8% by means of following heating up to temperature maximum 900C annealed, and then it is cooled up to temperature of molten electrolyte, herewith layer of ferric oxide at least on its surface, restored into pure iron. ^ EFFECT: receiving of strip with improved surface. ^ 9 cl, 1 dwg |
