Method and device for treating the surfaces of metallic strip material, especially for pickling rolled material

摘要

The invention relates to a method and a device for treating surfaces of metallic strip material ( 1 ), especially for pickling rolled material, in a treatment channel ( 2 ), with a pickling medium ( 3 ) containing acid. Jets ( 4 ) are set in the direction in which the strip is transported ( 5 ) at the entrance to the channel ( 2 a) and in the opposite direction that in which the strip is transported at the exit of the channel ( 2 b). The aim of the invention is to produce a closed liquid film with some turbulence on the surface of the strip. Said film should be maintained as far as the exit ( 2 b) of the channel. To this end, additional jets ( 4 ) between the channel entrance ( 2 a) and the channel exit ( 2 b) are oriented in the opposite direction to the direction in which the strip is transported ( 5 ) and the pickling medium ( 3 ) is further delayed in flowing out at the channel exit ( 2 b) by mechanical resistance devices ( 7 ) situated in the path of the transport channel ( 6 ).