Preparation method of zinc-aluminum-silicon-(cerium, lanthanum) rare earth alloy

Abstract

The invention discloses a method for preparing a zinc-aluminum-silicon-(cerium, lanthanum) rare earth alloy. The components of the zinc-aluminum-silicon-(cerium, lanthanum) rare earth alloy include: aluminum 15-21 part, 0.1-0.3 part of silicon, 0.3-0.6 part of mixed rare earth of cerium and lanthanum, 0-0.01 part of impurity, and the balance is zinc; the method comprises the following steps: ignition of alloy melting furnace in empty furnace; preheating; cease-fire, feeding raw materials ; heating, melting; ceasefire, secondary zinc ingots, cooling; electromagnetic stirring, manual stirring; argon filling; ash removal; random inspection; transfer of aluminum water; casting, solidification cooling; demoulding; cooling; deburring, polishing; The alloy melting furnace has a closed-loop temperature control system based on PLC-PC, and the casting, solidification and cooling processes are completed in the recovery and utilization of phase change heat energy alloy ingot casting machine. The present invention improves by introducing mixed rare earths of cerium and lanthanum to Substituting aluminum for zinc greatly reduces zinc content, and the preparation method of the invention has high product quality and production efficiency, low energy consumption and low production cost.

Description

technical field [0001] The invention relates to a method for preparing an alloy, in particular to a method for preparing a zinc-aluminum-silicon-(cerium, lanthanum) rare earth alloy. Background technique [0002] Steel is the most widely used metal material in the world. Steel corrosion seriously affects the service performance and life of steel materials. How to prevent steel corrosion and improve material performance is a worldwide research hotspot. The development of aluminum-zinc-silicon alloy materials for hot-dip plating, using its The prepared hot-dip galvanized steel sheet not only has excellent anti-corrosion performance, but also has a service life of more than 20 years. At the same time, its excellent heat reflectivity and processing and forming properties further expand the use of steel. At present, the hot-dip product in foreign research is zinc-aluminum- Silicon-rare earth alloys, zinc-aluminum-magnesium-rare earth alloys; domestic Galfan products are mostly pr...

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Problems solved by technology

[0003] At present, among the existing aluminum-zinc alloy materials for hot-dip coating, the Galfan alloy is Zn-5%Al, and the Zn consumption is too large to solve the long-term development problem of the hot-dip coating industry; the alloy materials are low in Pb, Cd, Sn, etc. Melting point metals are easy to cause intergranular corrosion of the coating, resulting in color changes; alloy materials have strict restrictions on the cooling rate of the steel plate, and the coating is prone to large-area pits and poor high-temperature oxidation resistance; Galvalume alloy, processing formability, corrosion resistance insufficient

[0004] At present, the stirring methods for alloy smelting are manual stirring, mechanical stirring and electromagnetic stirring. Manual stirring is labor-intensive in a high-temperature environment and is greatly affected by human factors; The chemical composition of the melt is purified, and the cost is high; at present, in the traditional electromagnetic stirring, the permanent magnet stirrer is small in size, easy to use, and does not need water cooling, but the strength of the magnet cannot be adjusted, and the magnet is easy to lose magnetism in a high temperature environment; due to The melting temperature of the alloy is 650-750°C, and the temperature of the bottom of the furnace after heat preservation after passing through the refractory material is 100-200°C, which is easy to cause loss of magnetism of the permanent magnet, so it is necessary to improve the stirring method in the smelting process

[0005] The temperature of the alloy is very high during casting. At present, direct water cooling is usually used to reduce the temperature of the ingot formed by solution casting to below 200°C, and the heat energy contained in the solution is very high, and its phase change latent heat reaches 388 kJ / kg; In the process, the temperature is directly lowered simply for solidification and molding, which causes a large amount of heat energy loss and waste in the casting and molding process. At the same time, a set of circulating cooling water system is required for the supporting operation during the casting process, which further consumes energy; The production cost of the enterprise cannot achieve low carbon and energy saving

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