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A kind of preparation method of environment-friendly zinc-aluminum-magnesium alloy coated steel plate

A technology of alloy coating, zinc-aluminum-magnesium, applied in metal material coating technology, coating, hot-dip coating technology, etc., can solve the problems of human body and environmental hazards, and achieve the goal of reducing hazards, uniform and dense coating structure, and stable structure Effect

Active Publication Date: 2020-11-24
TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The above patents all use the solvent method in the process of hot-dip galvanizing aluminum-magnesium alloys, that is, the steel plate is pickled, derusted and galvanized before hot-dip. During the treatment process, waste acid and other harmful substances will be produced, which is harmful to the human body and the environment. cause harm

Method used

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  • A kind of preparation method of environment-friendly zinc-aluminum-magnesium alloy coated steel plate
  • A kind of preparation method of environment-friendly zinc-aluminum-magnesium alloy coated steel plate
  • A kind of preparation method of environment-friendly zinc-aluminum-magnesium alloy coated steel plate

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Embodiment 1

[0032] The invention discloses a preparation method of an environment-friendly zinc-aluminum-magnesium alloy coated steel plate.

[0033] Take zinc ingot, magnesium ingot, aluminum ingot and aluminum foil according to the ratio of Al: 6wt%, Mg: 3wt%, and the balance is Zn (the quality of aluminum foil is included in the content of aluminum). Heat the zinc to 500°C to completely melt, weigh the aluminum block, press the aluminum block into the molten zinc solution with a graphite rod until it is completely melted, and stir. Weigh the magnesium block, wrap it with aluminum foil, and press it into the molten zinc solution with a graphite rod until it is completely melted to reduce oxidation and ablation loss. Raise the temperature of the alloy solution to 560°C, stir once every 30 minutes, keep warm for 5 hours, and set aside.

[0034]Mechanical derusting: adopt continuous derusting machine to hot-rolled Q235 steel plate (the specific material of Q235 steel plate is C: 0.12~0.2w...

Embodiment 2

[0039] The invention discloses a preparation method of an environment-friendly zinc-aluminum-magnesium alloy coated steel plate.

[0040] Zinc ingots, magnesium ingots, aluminum ingots and aluminum foils are taken according to the ratio of Al: 6wt%, Mg: 3wt%, and the balance is Zn. Heat the zinc to 520°C to completely melt, weigh the aluminum block, press the aluminum block into the molten zinc solution with a graphite rod until it is completely melted, and stir. Weigh the magnesium block, wrap it with aluminum foil, and press it into the molten zinc solution with a graphite rod until it is completely melted to reduce oxidation and ablation loss. Raise the temperature of the alloy solution to 580°C, stir once every 30 minutes, keep warm for 8 hours, and set aside.

[0041] Mechanical descaling: The hot-rolled Q235 steel plate is polished and derusted by a continuous descaling machine to clean the surface rust of the steel plate and improve the production efficiency of subsequ...

Embodiment 3

[0046] The invention discloses a preparation method of an environment-friendly zinc-aluminum-magnesium alloy coated steel plate.

[0047] Zinc ingots, magnesium ingots, aluminum ingots and aluminum foils are taken according to the ratio of Al: 6wt%, Mg: 3wt%, and the balance is Zn. Heat the zinc to 520°C to completely melt, weigh the aluminum block, press the aluminum block into the molten zinc solution with a graphite rod until it is completely melted, and stir. Weigh the magnesium block, wrap it with aluminum foil, and press it into the molten zinc solution with a graphite rod until it is completely melted to reduce oxidation and ablation loss. Raise the temperature of the alloy solution to 560°C, stir once every 30 minutes, keep warm for 5 hours, and set aside.

[0048] Mechanical descaling: The hot-rolled Q235 steel plate is polished and derusted by a continuous descaling machine to clean the surface rust of the steel plate and improve the production efficiency of subsequ...

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Abstract

The invention provides a preparation method of an environment-friendly zinc-aluminum-magnesium alloy coated steel plate. The preparation method comprises the steps of conducting pretreatment on a hotrolled low-carbon steel plate through mechanical derusting and electrolytic degreasing, heating the steel plate through a high-frequency induction heating device and conducting reduction on the pretreated steel plate in an N2-H2 mixed atmosphere to obtain a proper hot dip-coated surface; cooling the steel plate in an N2 atmosphere, controlling the temperature of the steel plate before dip platingand conducting dip plating in a zinc-aluminum-magnesium alloy plating solution; and then cooling the steel plate in the air. Through the preparation method, harm of pollutants generated in the traditional acid pickling, derusting and assistant plating process to human bodies and environments is avoided; the more and more strict requirements for environmental protection are met; the quality of a plating layer is improved, and the preparation method has broad application prospects.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanizing, in particular to an environment-friendly production method of a zinc-aluminum-magnesium alloy coated steel plate. Background technique [0002] Iron and steel materials are the metal materials with the largest output and widest uses in the world. They have many advantages such as good toughness, high strength, high hardness, and high production economy. However, during use, steel materials are exposed to humid air and seawater for a long time, or are often exposed to complex working conditions such as strong corrosiveness and industrial high temperature, so corrosion is prone to occur. Anodic protection, cathodic protection, addition of inhibitors, protective coatings and metallic coatings are all commonly used methods of protection. Zinc coatings are widely used for the protection of steel. In this case, the reactive zinc metal corrodes preferentially over the steel substrate throu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06C23C2/40C23C2/02C25F1/06C22C18/04C22C38/04C22C38/02C22C38/60C22C38/40
CPCC22C18/04C22C38/002C22C38/02C22C38/04C22C38/40C22C38/60C23C2/02C23C2/06C23C2/40C25F1/06
Inventor 曹晓明刘冬旭马瑞娜杜安范永哲赵雪
Owner TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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