Electrolysis: processes – compositions used therein – and methods – Electrolytic coating – Coating moving substrate
Reexamination Certificate
1999-10-01
2001-08-28
Valentine, Donald R. (Department: 1741)
Electrolysis: processes, compositions used therein, and methods
Electrolytic coating
Coating moving substrate
C205S154000, C205S302000, C204S211000, C204S269000, C029S592100, C428S544000
Reexamination Certificate
active
06280596
ABSTRACT:
INTRODUCTION
This invention relates to new electrolytic tinplating processes, apparatus and product; and, more particularly, is concerned with continuous-strip acidic-electrolyte tinplating lines utilizing horizontally-oriented plating cells which eliminate chemical dissolution of surface iron from steel substrate into stannous-ion acidic plating solutions.
OBJECTS OF THE INVENTION
A major object of the invention is to enable continued commercial usage of horizontally-oriented electrolytic tinplating lines which use acidic stannous-ion plating solutions. Eliminating dissolution of iron from an exposed surface of continuous-strip steel is important in achieving that object.
An added object is elimination of environmental concern, previously associated with horizontally-oriented continuous-line tinplating practice, which resulted from utilizing cyanide compounds to precipitate surface iron dissolved from steel substrate in prior horizontally-oriented acidic stannous-ion plating cells.
A specific object of the invention is eliminating loss of stannous plating ions, primarily due to surface iron dissolution, from halogen-bath or methylsulfonic acid tinplating solutions during horizontally-oriented tinplating operations.
The above, and other contributions and advantages of the invention are described in greater detail with reference to the accompanying drawings in which like reference numbers are used for like parts, whenever possible, in the various drawings briefly described below.
REFERENCES:
patent: 4446156 (1984-05-01), Salm
patent: 5628893 (1997-05-01), Opaskar
Austin Lowell W.
Chelen Eugene J.
Georgetti Tony
Sinsel John A.
Wilkerson Ralph
Shanley and Baker
Valentine Donald R.
Weirton Steel Corporation
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