Andritz-patentverwaltungs-gesellschaft M.b.h.

Maschinefabrik Andritz Actiengesellschaft

Ulrich Krupicka

Gerald Maresch

Process for the electrolytical coating of an object of steel on one or

In a process for the electrolytic zinc coating of high-grade steel on one and two sides, the latter is connected as a cathode in the form of a high-grade steel strip in a galvanic cell, and metallic zinc is deposited on the high-grade steel strip from an aqueous solution of a zinc salt with a pH value of 1.0 to 2.5, preferably 1.5 to 2.0, as a result of which a contact corrosion with zinc-coated metal sheet is avoided, which is particularly important in the motor-car industry.

Process for the electrolytic zinc coating of stainless steel

In a process for the electrolytic pickling of a high-grade steel strip, in particular a hot strip of high-grade steel, the hot strip of high-grade steel is alternately anodically and cathodically pickled in an aqueous solution of Na.sub.2 SO.sub.4 and subsequently in an aqueous solution of NaNO.sub.3 and NaF, as a result of which the formation of dangerous nitrous gases is prevented.

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Vienna, Austria

Ulrich Krupicka