C - Chemistry – Metallurgy – 25 – D
Patent
C - Chemistry, Metallurgy
25
D
204/19
C25D 5/36 (2006.01) C25F 1/00 (2006.01)
Patent
CA 1044174
ABSTRACT It is known to produce electrolysis metal coated steel strip by a method comprising pickling a hot-rolled steel strip, rinsing a first time and cold-rolling, and thereupon cleaning, rinsing a second time, tightly coiling, annealing and thereupon skin passing, upon which the strip is electrolytically coated. In this invention, during the cleaning operation the strip is first passed through a dip bath, after brushing then through an electrolysis bath, in which known saponifying, emul- sifying and suspension forming compounds are added to the bath liquids, whereupon the so cleaned strip after brushing and rinsing is passed through a (second) conditioning bath, in which there is added to the bath liquid between 10 and 5000 ppm of a substance which under annealing conditions blocks at least one of the above-described surface reactions causing graphitisation and which because of its electronic configua- tion (sp- or d- configuration) adsorbs preferentially to the active metal surface. This produces strip free from surface graphite.
228790
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