Protection process of flat rolled steel sections by means of mul

Details Protection process of flat rolled steel sections by means of mul Protection process of flat rolled steel sections by means of mul

1984-07-24

1985-10-22

Niebling, John F.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

428659, 428667, 204 27, 204 28, 204 384, 204 41, 204 56R, C03C 2702, C03C 2704, C25D 700

Patent

active

045488720

ABSTRACT:
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.

REFERENCES:
patent: 3616303 (1971-10-01), Carter
patent: 3816082 (1974-06-01), Austin
patent: 4437944 (1984-03-01), Bruno

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