Chemistry: electrical and wave energy – Processes and products
Patent
1984-05-08
1986-08-26
Metz, Andrew H.
Chemistry: electrical and wave energy
Processes and products
204 351, 204 41, C25D 512, C25D 1138
Patent
active
046081305
ABSTRACT:
Surface treated steel sheet having three layers consisting of a bottom layer of metallic chromium, a middle layer of metallic tin or tin-nickel alloy and a top layer of hydrated chromium oxide on a steel base, and a method for the continuous production of this surface treated steel sheet which comprises; (1) chromium plating on a steel base to form a layer of metallic chromium and hydrated chromium oxide, (2) tin plating by using a tin plating electrolyte having a low concentration of stannous ion or tin-nickel alloy plating by using a known tin-nickel alloy plating electrolyte, said electrolytes have a low current efficiency for tin or tin-nickel alloy plating, thereby removing said layer of hydrated chromium oxide from said chromium plated steel base; and (3) forming a layer of hydrated chromium oxide by a chromate treatment by using an acidic electrolyte containing hexavalent chromium ion.
Instead of the process (2) in the above method, a cathodic treatment of chromium plated steel base in an acidic solution having a pH of 0.5 to 2.0 can be carried out for the removal of hydrated chromium oxide formed during chromium plating, and thereafter, tin or tin-nickel alloy plating by using a known tin or tin-nickel alloy plating electrolyte can be performed.
By using this surface treated steel sheet, a welded can body can be produced at high speed without the removal of the plated layer in the welded part since it has an excellent weldability.
REFERENCES:
patent: 4064320 (1977-12-01), Adaniya et al.
patent: 4145263 (1979-03-01), Tsutsui et al.
patent: 4248676 (1981-02-01), Uchida et al.
patent: 4483907 (1984-11-01), Salm
patent: 4511631 (1985-04-01), Fujimoto
Fujimoto Terunori
Inui Tsuneo
Ishida Masatoki
Shimizu Nobuyoshi
Leader William T.
Metz Andrew H.
Toyo Kohan Co. Ltd.
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