Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating predominantly single metal or alloy substrate of...
Patent
1994-03-29
1995-06-06
Niebling, John
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Coating predominantly single metal or alloy substrate of...
205177, 205227, 205244, 205255, 205917, 205155, 4273768, 427433, C23C 1402, C25D 902
Patent
active
054219698
ABSTRACT:
A zinc or zinc-alloy plated steel sheet having an improved weldability and plating properties, as well as a method for making the same is provided. Even when the substrate steel sheet is the one which is difficult to deposit a zinc or zinc-alloy layer by conventional methods, such as an extra low carbon steel sheet, the present invention enables a reliable production of a galvanized steel sheet suffering from no plating failure of insufficient adhesion as well as a reliable production of a galvanized steel sheet suffering from no plating failure or streaking of the alloyed layer. The zinc or zinc-alloy plated steel sheet having improved weldability comprises an extra low carbon steel sheet, an iron-carbon plated layer or a carbon-rich layer generated by diffusion of the iron-carbon plated layer on at least one major surface of the extra low carbon steel sheet, and a zinc or zinc-alloy plated layer on the iron-carbon plated layer or the carbon-rich layer. The zinc or zinc-alloy plated steel sheet having improved weldability and/or plating properties is produced by depositing on the steel sheet an iron-carbon plated layer having a carbon content of from 0.01% by weight to 10% by weight to a coating weight of from 0.01 g/m.sup.2 to 10 g/m.sup.2, optionally annealing the iron-carbon plated steel sheet, and depositing a zinc or zinc-alloy plated layer, preferably by galvanizing or galvannealing, on the annealed steel sheet.
REFERENCES:
patent: 1501887 (1924-07-01), Crapo
patent: 1726652 (1929-09-01), Crapo
Kato Chiaki
Kimura Hajime
Morito Nobuyuki
Uesugi Yasuji
Yasuda Akira
Kawasaki Steel Corporation
Niebling John
Wong Edna
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