Abstract: The subject of the invention is the use of a treatment solution containing sulfate ions for treating the surface of a galvanized steel sheet for the purpose of reducing degradation of the coating during the operation of forming said sheet, and for the purpose of improving the temporary corrosion protection of said sheet. It also relates to a method of lubricating such a coated sheet.

Abstract: The invention concerns a plain or zinc-plated steel plate, additionally coated on at least one of its surfaces with a single zinc or zinc alloy layer containing 0.15 to 1 wt. % of a polymer consisting of 6 to 150 identical or different units of general formula: (CH2C(R)(CONH2))—, with R?H or CH3 and optionally comprising polyallyl units, and a method for making said plates by electroplating in sulphate baths.

Abstract: Electroplating cell comprising an electrolysis tank (2) containing a plating solution (S), at least one immersed anode (3), means for making a strip run through the solution (S) in front of said anode (3), from one of its edges (3A) to the opposite edge (3B), and electrically insulating masks (4A, 4B) arranged along said edges (3A, 3B).Said masks overhang said edges by an amount at least equal to the distance separating said anode (3) from said strip and overlap them by an amount less than the same distance.Application to coating with an alloy, especially a zinc-based alloy, especially in installations having several successive cells.The quality of the coating is improved, something which facilitates the subsequent forming and painting of the coated sheet.