Zinc-aluminum-silicon-rare earth alloy for hot-dip plating steel tube and preparation method thereof

A rare earth alloy and hot-dip plating technology, which is applied in hot-dip plating process, metal material coating process, coating, etc., to achieve the effects of reducing production costs, inhibiting growth, and reducing viscosity

Inactive Publication Date: 2013-03-27
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the "Sendrin effect" in the existing high-silicon steel dipping process, aiming to provide a new type of oil pipe hot-dip galvanizing that can further improve the corrosion resistance and wear resistance of the coating in harsh working environments Base alloy, improve the durability cycle of the tubing

Method used

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  • Zinc-aluminum-silicon-rare earth alloy for hot-dip plating steel tube and preparation method thereof
  • Zinc-aluminum-silicon-rare earth alloy for hot-dip plating steel tube and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Preparation method of Zn-30.0wt.%Al-1.5wt%Si-0.6wt.%La alloy

[0033] Step 1: Add zinc ingots accounting for 70.0% of the weight of the Zn-Al alloy into an intermediate frequency induction furnace, raise the temperature to 680°C, add aluminum ingots accounting for 30.0% of the weight of the Zn-Al alloy, melt and stir for 20 minutes; cool down to 620°C And keep it warm for 30 minutes, and cast the ingot into Zn-Al master alloy;

[0034] The second step: select Al-12.0wt.%Si master alloy and Al-10.0wt.%La master alloy as the object of alloying treatment, or prepare the above-mentioned master alloy by the following method.

[0035] 1. Preparation of Al-12.0wt.%Si master alloy

[0036] Put the aluminum ingot accounting for 88.0% 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 12.0%...

Embodiment 2

[0041] Preparation method of Zn-27.0wt.%Al-1.0wt%Si-0.1wt.%La alloy

[0042] The first and second steps of the alloy preparation method are the same as the example one;

[0043] Step 3: Put the zinc ingot accounting for 9.9067% of the total weight of the alloy and the zinc-aluminum master alloy accounting for 90% 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 master alloy of 0.0833% of the total weight of the alloy into the alloy liquid, melt and stir to mix evenly; cool down to 650°C, press the aluminum-lanthanum master alloy accounting for 0.01% of the total weight into the molten alloy with a bell jar In the alloy liquid, stir continuously until it is uniform, keep it warm for 30 minutes, remove the slag, and pour it into a metal mold of 300×150mm.

Embodiment 3

[0045] Preparation method of Zn-22.0wt.%Al-1.0wt%Si-0.1wt.%La alloy

[0046] The first and second steps of the alloy preparation method are the same as the example one;

[0047] Step 3: Put the zinc ingot accounting for 26.9067% of the total weight of the alloy and the zinc-aluminum master alloy accounting for 73% of the total weight of the alloy in an intermediate 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 master alloy of 0.0833% of the total weight of the alloy into the alloy liquid, smelt and stir to mix evenly; cool down to 650°C, press the aluminum-lanthanum master alloy accounting for 0.01% of the total weight of the alloy into the molten alloy with a bell jar In the alloy liquid, stir continuously until it is uniform, keep it warm for 30 minutes, remove the slag, and pour it into a metal mold of 300×150mm.

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Abstract

The invention relates to a zinc-aluminum-silicon-rare earth alloy for a hot-dip plating steel tube. The alloy consists of Zn, Al, Si and La. In percentage by weight, alloy consists of 20-30% of Al, 0.5-1.5% of Si, 0.05-0.6% of La and the balance of Zn. The alloy disclosed by the invention has the advantages of good mobility, even and smooth surfaces after a plating layer is formed, no skipping plate and good adhesion, so that the consumption of the raw materials is saved and the production cost is reduced. The corrosion resistance and abrasive resistance of the alloy plating layer are greatly enhanced; the corrosion resistance can reach 10 times to that of the common pure zinc plating layer; and the zinc-aluminum-silicon-rare earth alloy can be widely applied to the protection of steels in corrosive environments.

Description

technical field [0001] The invention relates to a steel hot-dip galvanized base alloy, and the alloy can be widely used in steel protection in corrosive environments. Background technique [0002] Corrosion of pipes is a common problem in oil and water wells in oil fields. Usually, pipes with a life span of 10 years will be corroded and perforated in half a year in severely corroded oil and gas fields, especially oil wells that have entered the late stage of high water cut development. At present, the commonly used anti-corrosion methods for oil pipes mainly include nickel-phosphorus plating, organic coatings, epoxy powder thermosetting coatings, and three-layer composite coatings. In comparison, the nickel-phosphorus coating is very thin and has poor corrosion resistance; organic coatings and epoxy powder heat-cured coatings have better corrosion resistance, but the coating is thicker, and the bonding strength with the oil pipe is poor, and it will appear after long-term us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/38C22C18/04C22C1/03
Inventor 涂浩赵群苏旭平王建华刘亚吴长军彭浩平
Owner CHANGZHOU UNIV
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