Preparing metal for melt-coating

Details Preparing metal for melt-coating Preparing metal for melt-coating

C - Chemistry, Metallurgy

23

C

117/93, 204/22.6

C23C 2/02 (2006.01) C23C 28/00 (2006.01) C25D 9/10 (2006.01)

Patent

CA 2007636

ABSTRACT PREPARING METAL FOR MELT-COATING Steel is prepared for hot-dip coating in molten zinc, by forming lead chloride on it in a greater mass (at least 12g/m2) than possible by evaporation from saturated aqueous solution. One way of so forming the lead chloride is to cathodise the steel (24000 coulomb/m2) in 1:1 HC1 saturated with lead chloride, and air-dry the steel. The steel thus prepared is dipped for 2 minutes in molten zinc or, for greater corrosion resistance, in molten scrap zinc.

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