Zincroksid S.p.a.

Carlo Lavezzari

An improved process for the protection of flat rolled steel sections in the form of bands, plates or sheets in particularly aggressive environments is disclosed. According to applicant's copending U.S. patent application Ser. No. 585,856, filed Mar. 2, 1984, U.S. Pat. No. 4,520,077, steel plates previously plated with zinc or zinc alloys are, as such, plated with layers of an electrolytic plating consisting of inorganic elements or compounds, preferably chromium metal and chromium oxide. The improvement according to this invention comprises a chemical passivation in a chrome anhydride solution of the zinc base plating layer, prior to carrying out the successive multi-layer electrolytic plating of inorganic elements or compounds.

Protection process of flat rolled steel sections by means of multi-layer

A process is disclosed for the protection of steel rolled sections, in form of rolls, sheets or plates, already plated with zinc or zinc containing alloys, by means of one or more layers of an electrolytic plating, consisting of inorganic elements or compounds, preferably metal chrome and chrome oxide.

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Varzi, Italy

Carlo Lavezzari