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AssigneePolitechnika Salaska Im. Wicentego Pstrowskiego
InventorsAdam Gierek, Lech Bajka, Piotr Liberski, Anna Gruszecka
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A method of producing layers of lead and its alloys on workpieces made of ferrous alloys comprising dipping the workpieces to be coated into a two-layer bath, the upper layer of which is a bath of aluminum or its alloys, and the bottom layer of which is a bath of lead or its alloys. The workpieces are then taken out of the deeper layer of the bath of lead and its alloys by pulling them through the upper layer of the bath of aluminum and its alloys, or by pulling the workpieces through the bath of metal, provided in a vessel connected with the bottom layer of the bath. The temperature of both baths, the upper bath and of the bath in the vessel connected with the bottom bath, is maintained within the range of 150.degree. C to 900.degree. C. The temperatures of the bath of the upper layer, of the bath of the bottom layer, and of the bath in the vessel connected with the bath of the bottom layer are equal or differ from each other by 50.degree. C to 750.degree. C.
A method of producing a corrosion-resistant, diffusion layer of lead or its alloys on a workpiece made of a ferrous alloy, said method comprising dipping the workpiece to be coated into a two-layer bath, the upper layer of which is a bath of aluminum of its alloys, and the lower layer of which is a bath of lead or its alloys, the workpiece passing first through the upper layer to form an aluminum coating thereon and then through the lower layer to form a diffusion lead layer of uniform thickness and corrosion-resistant properties.
Dependencies are inferred from the claim text.