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A kind of corrosion-resistant zinc-aluminum-magnesium rare earth alloy coating and its preparation and hot-dip coating method

A rare-earth alloy, zinc-aluminum-magnesium technology, applied in hot-dip plating process, metal material coating process, coating, etc., can solve problems such as poor stability of hot-dip plating operation, affect the appearance of the coating, and poor corrosion resistance, so as to avoid Missing plating or surface defects, improving the effect of auxiliary plating, and improving the quality of plated parts

Inactive Publication Date: 2017-06-13
中国电建集团华中电力设计研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there are few reports on the low-Al zinc-magnesium-aluminum rare earth coating process.
[0007] Chinese patent CN102477522 hot-dip corrosion-resistant galvanized layer, aiming at the shortcomings of poor corrosion resistance of existing GI galvanized sheets, invented Zn-Al-Mg-Re quaternary galvanized layer, the coating composition is: Al0.15-1wt% , Mg1-7wt%, Re0.02-1wt%, the rest is Zn, wherein Re is La, Ce or La, Ce mixed rare earth, the zinc pool prepared by the zinc ingot of this composition has excellent zinc liquid flow performance, and the prepared plating Zinc sheet has excellent corrosion resistance, formability, coating adhesion and surface quality, etc.
[0008] However, this patent has its shortcomings: due to the high content of magnesium in the coating, magnesium is very easy to oxidize, and the slag formed will affect the appearance of the coating, resulting in uneven coating, serious oxidation of the alloy bath, and poor stability in hot-plating operation. When the product is stored, sometimes the coating will crack and make the coating gray

Method used

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  • A kind of corrosion-resistant zinc-aluminum-magnesium rare earth alloy coating and its preparation and hot-dip coating method
  • A kind of corrosion-resistant zinc-aluminum-magnesium rare earth alloy coating and its preparation and hot-dip coating method
  • A kind of corrosion-resistant zinc-aluminum-magnesium rare earth alloy coating and its preparation and hot-dip coating method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The corrosion-resistant zinc-aluminum-magnesium rare earth alloy coating of the present embodiment, the alloy zinc ingot that adopts when preparing the alloy coating consists of the following components by weight percentage:

[0041] Al: 3.0wt%, Mg: 0.06wt%, La: 0.03wt%, the balance is Zn and acceptable trace impurities.

[0042]Melt the alloy according to the weight ratio of alloying elements in the above formula. First, heat 726.83g of zinc ingot to 480°C. Keep at ℃ for 2 hours, and stir with a quartz rod every 20 minutes in the middle; after the alloy is fully melted, heat it to 750℃, clamp 0.23g of rare earth La with pliers and press it into the bottom of the molten pool, and keep it at 750℃ for 1h. Afterwards, the temperature of the electric furnace is lowered to 600° C. to obtain the Zn-Al-Mg-La alloy plating solution.

[0043] The method for carrying out hot-dip coating using the corrosion-resistant zinc-aluminum-magnesium rare-earth alloy coating includes alkal...

Embodiment 2

[0046] The corrosion-resistant zinc-aluminum-magnesium rare earth alloy coating of the present embodiment, the alloy zinc ingot that adopts when preparing the alloy coating consists of the following components by weight percentage:

[0047] Al: 4.5wt%, Mg: 0.05wt%, La: 0.10wt%, the balance is Zn and acceptable trace impurities.

[0048] Melt the alloy according to the weight ratio of alloying elements in the above formula. First, heat 800.94g of zinc ingot to 490°C. Keep at ℃ for 2 hours, and stir with a quartz rod every 20 minutes in the middle; after the alloy is fully melted, heat it to 750℃, clamp 0.84g of rare earth La with pliers and press it into the bottom of the molten pool, and keep at 750℃ for 1h. Afterwards, the temperature of the electric furnace is lowered to 600° C. to obtain the Zn-Al-Mg-La alloy plating solution.

[0049] The method for carrying out hot-dip coating using the corrosion-resistant zinc-aluminum-magnesium rare-earth alloy coating includes alkali ...

Embodiment 3

[0052] The corrosion-resistant zinc-aluminum-magnesium rare earth alloy coating of the present embodiment, the alloy zinc ingot that adopts when preparing the alloy coating consists of the following components by weight percentage:

[0053] Al: 3.5wt%, Mg: 0.08wt%, La: 0.05wt%, the balance is Zn and acceptable trace impurities.

[0054] Melt the alloy according to the weight ratio of alloy elements in the above formula. First, heat 650.50g of zinc ingot to 500°C. Keep at ℃ for 2 hours, and stir with a quartz rod every 20 minutes in the middle; after the alloy is fully melted, heat it to 750℃, clamp 0.34g of rare earth La with pliers and press it into the bottom of the molten pool, and keep at 750℃ for 1h. Afterwards, the temperature of the electric furnace is lowered to 600° C. to obtain the Zn-Al-Mg-La alloy plating solution.

[0055] The method for carrying out hot-dip coating using the corrosion-resistant zinc-aluminum-magnesium rare-earth alloy coating includes alkali was...

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Abstract

The invention discloses a corrosion-resistant Zn-Al-Mg rare earth alloy coating, a preparation and a hot dipping method thereof. The corrosion-resistant Zn-Al-Mg rare earth alloy coating comprises the following raw materials by ratio: 3-9wt% of Al, 0.03-0.09wt% of Mg, 0.01-0.15wt% of rare earth and the balance of zinc, wherein rare earth is lanthanum, cerium or praseodymium. Various raw materials are mixed and prepared through an alloy fusion step to fusion alloy, the plating liquid has good fluidity and has good wellability on steel base; steel with pretreated surface enables hot dipping on the prepared fusion alloy, the corrosion-resistant Zn-Al-Mg rare earth alloy coating is plated on the surface, the coating has smooth surface and has good anticorrosion performance.

Description

technical field [0001] The invention relates to the technical field of hot-dip galvanizing, in particular to a corrosion-resistant zinc-aluminum-magnesium rare earth alloy coating, its preparation and a hot-dip galvanizing method. Background technique [0002] Material corrosion is the phenomenon that materials are destroyed after chemical and electrochemical reactions with the surrounding environment. Material corrosion pervades all fields of the national economy and brings huge losses to the national economy. Doing a good job in the anti-corrosion work of materials is not a purely technical problem, but a series of major social and economic issues related to resource protection, energy saving, material saving, environmental protection, normal production and personal safety, and development of new technologies. . [0003] The most widely used metal in hot-dip materials is zinc. With the development of new industries and technologies and the increasingly serious environmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C2/06
Inventor 彭奕亮曹志民万红连辉李国新
Owner 中国电建集团华中电力设计研究院有限公司
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