Production method of zinc-aluminum alloy suitable for hot-dip galvanized steel pipe

Abstract

The invention discloses a production method of a zinc-aluminum alloy suitable for a hot-dip galvanized steel pipe. The production method comprises the following operation steps: the zinc-aluminum alloy comprises the following chemical components in percentage by mass: 0.3-0.4% of Al and less than Pblt of impurities; 0.005, Filt, 0.005, Filt; 0.005, Cd < lt >; 0.002, Sn < lt >; 0.002, Cut, 0.002, Cut; 0.002, the balance being Zn; intermediate frequency furnace smelting equipment is used for realizing zinc melting production; a modified vibrating and beating flat hammer is adopted, 4-5 round holes with the diameter phi being 10 mm are drilled in a plate head of the flat hammer, four knotting claws are welded to the working face of the vibrating and beating flat hammer, the temperature curve of an oven is determined to be 0-220 DEG C, and the heating time is 0.5 h; then keeping the temperature at 220 DEG C for 2 hours; the temperature is raised for 0.5 hour at 220-440 DEG C, and then the temperature is kept at 440 DEG C for 2 hours; the temperature is increased for 0.5 hour at 440-660 DEG C, and the temperature is kept at 660 DEG C for 2 hours; the temperature is increased for 0.5 hour at the temperature of 660-880 DEG C, and then the temperature is kept at 880 DEG C for 2 hours; and the temperature of the molten aluminum is further increased to 1050 DEG C, so that the problem of aluminum segregation can be solved.

Description

technical field [0001] The invention relates to a method for producing zinc-aluminum alloy suitable for hot-dip galvanized steel pipes. Background technique [0002] Hot-dip galvanizing is a process technology that immerses metals such as steel, stainless steel, and cast iron into molten liquid metal or alloy to obtain a coating. Hot-dip pure galvanized products have excellent corrosion resistance and relatively low cost. Hot-dip galvanized products are suitable for steel Corrosion reduction and life extension, energy saving and material saving play an inestimable and irreplaceable role. Because zinc has good corrosion resistance in the atmosphere exposure environment, and the standard electrode potential of zinc is negative to that of iron, the galvanized layer has the function of sacrificial anode protection of the steel base in water and humid air, which can greatly prolong the life of the steel. service life. [0003] No matter which zinc alloy is used for hot-dip galv...

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Problems solved by technology

[0005] The purpose of the present invention is to provide a zinc-aluminum alloy production method suitable for hot-dip galvanized steel pipes, which can solve the problems of smelting and refining zinc-aluminum alloys, component segregation during casting, and improve production efficiency, so as to achieve industrialization. To reduce user costs and replace similar alloy products

At the same time, the invention helps to solve the problems of dark coating on the surface of the galvanized steel pipe and uneven thickness of the coating on the surface of the galvanized steel pipe.

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