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A preparation method of strong corrosion-resistant hot-dip magnesium-aluminum-zinc plate

A magnesium-aluminum-zinc, hot-dip technology, applied in the hot-dip plating process, coating, metal material coating process and other directions, can solve the problem of accelerated decline of magnesium content, affecting hot-dip plating, etc.

Active Publication Date: 2020-10-20
JIANGSU GANGZHENG STEEL SHEET SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the production process, due to the high affinity between magnesium and oxygen, it is easy to form magnesium oxide on the surface of the plating solution, which promotes the accelerated decline of magnesium content and produces a large amount of magnesium-aluminum-zinc dross, which affects the quality of hot-dip plating. Work properly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] First add 89.7915 tons of pure zinc ingots to the zinc pot and heat it to 475-480°C. After the pure zinc ingots are completely melted, add 9.09 tons of zinc-aluminum alloy with an aluminum content of 55% to the zinc pot, and gradually increase the temperature To 510°C, add 1 ton of magnesium, 0.08 ton of lanthanum, 0.01 ton of silicon, 0.01 ton of copper, 0.01 ton of nickel, 0.002 ton of titanium, 0.001 ton of cadmium, 0.01 ton of cerium, and 0.001 ton of niobium to the zinc pot in a constant temperature state, After 4 hours, add 0.005 tons of zinc chloride to the zinc pot at one time, and after the melting is complete, a new type of magnesium-aluminum-zinc plating solution is obtained.

Embodiment 2

[0018] First add 80.3604 tons of pure zinc ingots to the zinc pot and heat it to 475-480°C. After the pure zinc ingots are completely melted, add 16.4 tons of zinc-aluminum alloy with an aluminum content of 55% to the zinc pot, and gradually increase the temperature To 550°C, add 3 tons of magnesium, 0.15 tons of lanthanum, 0.12 tons of silicon, 0.05 tons of copper, 0.02 tons of nickel, 0.006 tons of titanium, 0.0005 tons of cadmium, 0.015 tons of cerium, and 0.0011 tons of niobium into the zinc pot in a constant temperature state. After 4 hours, add 0.005 tons of zinc chloride to the zinc pot at one time, and after the melting is complete, a new type of magnesium-aluminum-zinc plating solution is obtained.

Embodiment 3

[0020] First add 68.6613 tons of pure zinc ingots to the zinc pot and heat it to 475-480°C. After the pure zinc ingots are completely melted, add 27.27 tons of zinc-aluminum alloy with an aluminum content of 55% to the zinc pot, and gradually increase the temperature To 590°C, add 3.5 tons of magnesium, 0.25 tons of lanthanum, 0.15 tons of silicon, 0.1 tons of copper, 0.03 tons of nickel, 0.01 tons of titanium, 0.001 tons of cadmium, 0.02 tons of cerium, and 0.0012 tons of niobium into the zinc pot in a constant temperature state. After 4 hours, add 0.005 tons of zinc chloride to the zinc pot at one time, and after the melting is complete, a new type of magnesium-aluminum-zinc plating solution is obtained.

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Abstract

The invention discloses a preparation method for a strong corrosion-resistant hot-dipped magnesium aluminum zinc plate. The preparation method comprises the steps of degreasing, water washing, drying,continuous annealing, hot-dipping, cooling, finishing, tension leveling, post-processing, drying and obtaining of a finished product. A plating solution used in the hot-dipping process comprises 1-3.5% of magnesium, 5-15% of aluminum, 0.01-0.15% of silicon, 0.01-0.1% of copper, 0.01-0.02% of cerium, 0.08-0.25% of lanthanum, 0.002-0.01% of titanium, 0.001-0.0012% of niobium, 0-0.03% of nickel, 0-0.001% of cadmium and the balance zinc. In the hot-dipping process, the magnesium aluminum content of the plating solution is re-adjusted, by adding a certain amount of lanthanum, silicon, copper, nickel, titanium, cadmium, cerium, niobium and the like, the elements generate the synergistic effect, oxidation of magnesium can be inhibited, the adhesion between the plating solution and a substrate can be enhanced, meanwhile a protection film is formed on the surface of a plating layer and the notch end face of the plating layer, and the corrosion resistance of a notch is enhanced.

Description

technical field [0001] The invention relates to a magnesium-aluminum-zinc plate, in particular to a preparation method of a strong corrosion-resistant hot-dip magnesium-aluminum-zinc plate. Background technique [0002] With the rapid development of science and technology, all walks of life have higher and higher requirements for metal sheets in terms of corrosion resistance, environmental protection and safety. The corrosion resistance of traditional galvanized substrates is far from meeting the needs of modern society. Corrosion product pursuit. [0003] In recent years, in research and development and production, it has been found that magnesium element has a strong corrosion resistance to improve zinc-based coatings. This product exhibits excellent corrosion resistance, formability, scratch resistance and paintability. However, in the production process, due to the high affinity between magnesium and oxygen, it is easy to form magnesium oxide on the surface of the plat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C22C18/04
CPCC22C18/04C23C2/06
Inventor 刘允华
Owner JIANGSU GANGZHENG STEEL SHEET SCI & TECH
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