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Method for producing zinc-aluminum-magnesium alloy coated steel products with good corrosion resistance and zinc-aluminum-magnesium alloy coated steel products

A production method, zinc-aluminum-magnesium technology, applied in the direction of coating, hot-dip plating process, metal material coating process, etc., to achieve broad application prospects, avoid missing plating, and improve product qualification rate

Active Publication Date: 2008-01-23
ANSC TKS GALVANIZING
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to solve the problems existing in the production of zinc-aluminum-magnesium alloy coated steel by gas reduction method and solvent method, the invention provides a production method of zinc-aluminum-magnesium alloy coated steel and a zinc-aluminum-magnesium alloy coated steel

Method used

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Embodiment Construction

[0011] The zinc-aluminum-magnesium-coated steel production method of the present invention has two processes.

[0012] The process of the present invention mainly adopts the process of decoiling-welding-degreasing-annealing-temperature adjustment-hot-dip plating-air knife wiping-cooling-coiling, which is characterized in that:

[0013] a) The chemical composition of the plating solution is 2.5% to 20% of Al, 1.5% to 4.5% of Mg, 0.01% to 0.3% of RE, and the rest is Zn and unavoidable impurities;

[0014] b) The temperature of the strip steel entering the zinc pot is 480℃~520℃, the temperature of the plating solution is controlled at 470℃~520℃, the residence time of the plated parts in the plating solution is 2s~30s, the pressure of the air knife is 2kPa~80kPa, Post-cooling rate > 1°C / s.

[0015] The chemical composition of the coating of the present invention is as follows: 2.5%-20% Al, 1.5%-4.5% Mg, 0.01%-0.2% RE (mixed rare earth), and the rest are Zn and unavoidable impurit...

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Abstract

The present invention discloses a process for preparing zincium aluminum-magnesium alloy plating steel products and zincium aluminum-magnesium alloy plating steel products. A solvent method and a gas fluid reduction method are adopted, wherein the chemical components of the plating solution is 2.5-20% of AL, 1.5-4.5% of Mg, 0.01-0.3% of RE, with the rest being Zn and unavoidable impurities; right amount of Si and V are added into the plating solution, wherein the solvent is aqueous solution with a chemical composition of 200-1000g / L ZnCl2, 0-200g / L NH4Cl, 0-100g / L KCl, 0-100g / L NaCl and 0-100g / L rare earth chloride, with the pH being 3-4; the temperature of the plating solution is controlled at 450-580 DEG C, and the plating time is 2-300s. The present invention improves the moisturising capacity for steel products, restrains the reaction of aluminum and chlorides solvents, and then avoids plating leakage occurring and improves the bonding force of plating layers, not only can produce sheet materials but also can produce plating steel products such as sectional materials, pipes and wire rods, and have wide extending and applying foreground.

Description

technical field [0001] The invention belongs to the field of hot-dip galvanizing, in particular to a zinc-aluminum-magnesium coated steel material with good corrosion resistance and a production method. Background technique [0002] In the field of hot-dip galvanizing, in order to improve the corrosion resistance of galvanized steel, zinc 5% aluminum 0.06% rare earth alloy coated steel (trade name Galfan), zinc 55% aluminum 1.6% silicon alloy coated steel (trade name Galvalume), but the zinc 5% aluminum 0.06% rare earth alloy only improves the corrosion resistance by 2 to 3 times. Although the zinc 55% aluminum 1.6% silicon significantly improves the corrosion resistance, it loses the cathodic protection performance of zinc. The zinc-aluminum-magnesium alloy coated steel materials provided by US3505043, JP-10-226865, and JP-11-193452 have significantly improved corrosion resistance, and due to the use of magnesium, the cathodic protection performance is good, but due to the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06
Inventor 李锋林彬姜成林
Owner ANSC TKS GALVANIZING
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