Pretreatment of portion of ferrous metal strip with...

Details Pretreatment of portion of ferrous metal strip with... Pretreatment of portion of ferrous metal strip with...

C - Chemistry, Metallurgy

23

C

148/17, 117/64

C23C 2/06 (2006.01) C23C 2/02 (2006.01)

Patent

CA 1081058

ABSTRACT OF THE DISCLOSURE Mild steel strip is galvanized in selected areas only, typically on one side only of the strip, by pretreating the areas selected for absence of galvanizing to form thereon a readily chemically strippable coating of chemically-hydrated compounds non-wetting in molten zinc. Preferably, the pretreatment is carried out using phosphoric acid solution to form thereon a thin coating of a composite of hydrated iron phosphates and iron hydroxides. After passing the thus- treated steel strip through the molten zinc bath and solidification of the zinc coating, the composite coating is removed by dilute mineral acid. Mild steel strip galvanized on one side using this procedure has particular utility in the automotive industry.

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