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AssigneesAzuma Kogyo Co., Ltd., Toshin Chemical Industry Co., Ltd.
InventorsTsuneji Uchida, Suzuo Murotani, Kenji Hagimori, Yuzuru Abe
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A steel material subjected to preliminary treatments to remove an oxide film on the surface is immersed in a molten flux bath in an independent vessel and thereafter immersed in a molten zinc-aluminum alloy bath in a separate vessel to be galvanized with a coating of the alloy. The molten flux bath consists essentially of 5-25 wt % of an alkali metal chloride, typified by sodium chloride, or an alkaline earth metal, and the balance being zinc chloride. The flux bath may additionally contain 1-5 wt % of an alkali metal fluoride typified by sodium fluoride. The method allows for inexpensive, efficient and one-stage galvanizing with a corrosion-resistant molten zinc alloy of a high aluminum content to produce a smooth, uniform and beautiful galvanized layer on the surfaces of various steel materials.
A method of galvanizing with a molten zinc-aluminum alloy comprising immersing an oxide-film free iron or steel material in a molten flux bath in a first vessel, said molten flux bath consisting essentially of 80 to 90 wt % of zinc chloride and 10 to 20 wt % of at least one metal chloride selected from the group consisting of an alkali metal chloride and an alkaline earth metal chloride and optionally an alkali metal fluoride, said molten flux bath being maintained at a temperature of 400 to 560° C., and thereafter immersing the resultant flux coated iron or steel material in a bath containing a molten zinc-aluminum alloy in a second vessel to coat the resultant flux coated iron or steel material with a zinc-aluminum alloy layer, said molten zinc-aluminum alloy being a zinc alloy of a high aluminum content comprising 5-80 wt % aluminum and the balance being zinc and optionally comprising one, or two or more additional elements selected from the group consisting of silicon, magnesium and a rare earth element.
Dependencies are inferred from the claim text.