Zinc-based alloy used in steel hot dipping, and preparation method thereof

A hot-dip galvanizing and base alloy technology, applied in hot-dip galvanizing process, metal material coating process, coating, etc., can solve the problem of excessive slag, improve product quality, reduce production cost, and reduce viscosity Effect

Active Publication Date: 2012-03-28
CHANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problem of excessive slag in the existing Galvalume molten pool, and provide a steel hot-dip galvanized base alloy that can effectively reduce the slag in the molten pool. The present invention also provides the hot-dip galvanized steel alloy Preparation method of zinc-based alloy

Method used

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  • Zinc-based alloy used in steel hot dipping, and preparation method thereof
  • Zinc-based alloy used in steel hot dipping, and preparation method thereof
  • Zinc-based alloy used in steel hot dipping, and preparation method thereof

Examples

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Effect test

preparation example Construction

[0026] 1. Preparation of Al-Si Master Alloy

[0027] Put the aluminum ingot accounting for 80% of the weight of the Al-Si master alloy into the medium-frequency induction furnace, raise the temperature to 720°C, add a salt covering agent on the surface of the aluminum liquid, and use a bell jar to press the silicon block accounting for 20% of the weight of the Al-Si master alloy. Pour into molten aluminum, smelt, stir until uniform, keep warm for 30 minutes, and cast into a copper mold with an inner diameter of 50mm.

[0028] 2. Preparation of Al-Mg Master Alloy

[0029]First, preheat the magnesium ingot accounting for 10% of the weight of the Al-Mg master alloy and the aluminum ingot accounting for 90% of the weight of the Al-Mg master alloy to 200°C, preheat the crucible to a dark red color of about 500°C, and sprinkle the crucible wall and bottom with Appropriate amount of RJ-5 solvent; then add the preheated aluminum ingot to the crucible, raise the temperature to 700°C, ...

Embodiment 1

[0048] Step 1: Add zinc ingots accounting for 60% of the weight of the Zn-Al alloy into an intermediate frequency induction furnace, raise the temperature to 650°C, add aluminum ingots accounting for 40% of the weight of the Zn-Al alloy, melt and stir for 20 minutes; cool down to 600°C And keep it warm for 30 minutes, and cast the ingot into Zn-Al master alloy;

[0049] The second step: select Al-Si master alloy, Al-Mg master alloy and Al-La master alloy as the object of alloying treatment, or prepare the above-mentioned master alloy by the following method.

[0050] 1. Preparation of Al-Si Master Alloy

[0051] Put the aluminum ingot accounting for 80% of the weight of the Al-Si master alloy into the medium-frequency induction furnace, raise the temperature to 720°C, add a salt covering agent on the surface of the aluminum liquid, and use a bell jar to press the silicon block accounting for 20% of the weight of the Al-Si master alloy. Pour into molten aluminum, smelt, stir u...

Embodiment 2

[0060] The first and second steps of the alloy preparation method are the same as in Example 1.

[0061] Step 3: Put the zinc ingot accounting for 44.4% of the total weight of the alloy and the zinc-aluminum master alloy accounting for 28.5% of the total weight of the alloy in a medium-frequency induction furnace, raise the temperature to 720°C, add a salt covering agent on the surface of the alloy liquid, and use a clock Press the aluminum-silicon intermediate alloy with 7.5% of the total weight of the alloy into the alloy liquid, smelt and stir to mix evenly; cool down to 650°C, use a bell jar to mix the aluminum-magnesium intermediate alloy with 16% of the total weight of the alloy and 3.6% of the total weight The aluminum-lanthanum master alloys were respectively pressed into the molten alloy solution, stirred continuously until uniform, kept for 30 minutes, slag was removed, and poured into a metal mold of 300×150mm.

[0062] The alloy prepared through the above three ste...

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Abstract

The invention discloses a zinc-based alloy used in steel hot dipping, and a preparation method thereof. According to the invention, a zinc ingot and Zn-Al interalloy are placed in a medium-frequency induction furnace; the materials are heated to a temperature of 720 DEG C, such that an alloy liquid is produced; a salt covering agent is added on the surface of the alloy liquid, and Al-Si interalloy is pressed into the alloy liquid; the mixture is smelted and well mixed by stirring; the temperature of the mixture is reduced to 650 DEG C, such that a fused alloy liquid is produced; Al-Mg interalloy and Al-La interalloy are respectively pressed into the fused alloy liquid, and the mixture is continuously stirred until uniform; the temperature is maintained for 30 minutes, and slag is fetched;and the material is cast into a metal mold, such that the zinc-based alloy used in steel hot dipping is obtained, wherein the alloy comprises elements of, by weight: 20 to 40% of Al, 0.5 to 3% of Si,0.5 to 3% of Mg, 0.05 to 1% of La, and balance of Zn. With the method, corrosion resistance of the alloy can be effectively improved, viscosity of alloy melt can be reduced, wettability of the alloy upon a steel substrate can be improved, grains of the alloy can be thinned, dissolubility of iron in a zinc tank can be continuously and effectively reduced, zinc slag production in the zinc tank can be reduced, and the zinc slag with a limited amount in the zinc tank can be converted from bottom slag into dross.

Description

technical field [0001] The invention relates to a steel material hot-dip galvanized base alloy widely used in steel material protection in corrosive environments. . Background technique [0002] Hot-dip galvanizing is a more effective and convenient steel anti-corrosion method, which has been widely used in engineering. The zinc coating has excellent sacrificial protection, but the coating has a short durability. The hot-dip aluminum layer is dense and durable, but the cathodic protection ability is poor. The zinc-aluminum alloy coating takes into account the durable protection of aluminum and the cathodic protection of zinc. The performance of its coating is superior to that of a single-element coating, and its anti-corrosion performance is several times higher than that of pure zinc coating. Galvalume coating (aluminized zinc plate, containing 55% Al by weight, 43.4% Zn, 1.6% Si) has a unique microstructure, and its excellent corrosion resistance, formability and welding...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/04C22C1/03
Inventor 涂浩李振锋苏旭平王建华刘亚吴长军
Owner CHANGZHOU UNIV
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