An electrolytically acting doctor blade for pickling and cleaning curved metal surfaces comprises an electrode (2, 26, 34) embodied by a metal wire (8, 32) around which a pad (7, 30) made of a felt-like absorbent plastic material, resistant to high temperatures and to the chemicals contained in the electrolytic solution used, is wrapped; gripping means of the doctor blade on the electrode over the length of the face (F) of the doctor blade; electrical connection of the ends of the metal wire (8, 32) by means of a power supply electric cable (16) to initiate the electrolytic action; and has the gripping means of the doctor blade (1) on the electrode (2, 26, 34) connected to each other by the means placed alongside, in which the connection section, in the deformable body of the doctor blade (3) which has been made pliable, is oriented towards the face (F) of the doctor blade; a push or pull mechanism acts on the ends (25) of the doctor blade and, to obtain a reaction, with a middle part of the mechanism, connected to the middle part of the deformable body of the doctor blade (3), deforms the face of the doctor blade from rectilinear into the arched, convex or concave conformation, depending on the pull or push on the ends of the doctor blade, with respect to the middle part of the doctor blade, exerted by the said mechanism.
Different constructive forms of electrolytically acting doctor blade for pickling and cleaning curved metal surfaces with the use of different deformable electrodes are described.