Method for carrying out hot-dipping on aluminum-zinc alloy on steel surface

A steel surface, hot infiltration technology, applied in hot dip plating process, metal material coating process, coating and other directions, can solve problems such as difficult to handle large workpieces, and achieve low production cost, low temperature and simple process steps. Effect

Inactive Publication Date: 2014-12-03
STATE GRID CORP OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Powder method is difficult to handle large workpieces

Method used

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  • Method for carrying out hot-dipping on aluminum-zinc alloy on steel surface
  • Method for carrying out hot-dipping on aluminum-zinc alloy on steel surface
  • Method for carrying out hot-dipping on aluminum-zinc alloy on steel surface

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The Q345 steel plate is immersed in the alloy solution at 480°C after the fluxing treatment. The composition of the alloy solution is Zn-5%Al-2%Mg-0.2%RE (RE is mixed rare earth containing cerium), and the hot dipping time is 2 minutes. . The cross-sectional morphology and the surface distribution of the main components of the hot-impregnated layer are shown in figure 1 . The inner layer is an aluminum-zinc-iron alloy layer (the average atomic ratio of aluminum-iron-zinc elements is about 46:35:19), with a thickness of about 55 μm, and the outer layer is a zinc-aluminum alloy layer, with a thickness of about 10 μm. Compared with the Zn-5%Al-2%Mg-0.2%RE coating (with no penetration layer structure) converted into the same thickness, the time for rust spots to appear in the neutral salt spray test is extended to 1.5 times.

Embodiment 2

[0030] The Q235 steel plate is immersed in the Zn-6%Al-3%Mg-0.1%RE alloy liquid, and the temperature of the alloy liquid is 470°C. The impregnation time is 2min, and the cross-sectional morphology and main component surface distribution of the obtained alloy layer are shown in figure 2 . The inner layer is an Al-Zn-Fe alloy layer (the average atomic ratio of Al-Fe-Zn elements is about 47:36:18), with a thickness of about 80 μm, and the outer layer is a zinc-aluminum alloy layer, with a thickness of about 11 μm. Compared with the Zn-6%Al-3%Mg-0.1%RE coating (no permeation layer structure was formed), the time to appear rust spots in the neutral salt spray test was extended to 1.4 times.

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Abstract

The invention relates to a method for carrying out hot-dipping on an aluminum-zinc alloy on a steel surface, and belongs to the technical field of steel hot-dipping processes. According to the method, hot-dipping temperature is melting point Tm+(80-100) DEG C, and hot-dipping time is 30-200 seconds; and an adopted dip plating solution comprises the following materials in percentage by weight: 3%-15% of aluminum, 1%-5% of magnesium, 0.05%-0.5% of cerium-containing mixed rare earth, less than 0.5% of optional one or more optional additional elements and the balance of zinc. According to the method, an obtained alloy layer structurally comprises a zinc-aluminum alloy layer and an aluminum-zinc-iron alloy layer sequentially from outside to inside. Compared with the structure and thickness of a plating layer of the traditional hot-dipping zinc-aluminum alloy, the plating layer takes the aluminum-zinc-iron alloy layer as a main part; and the total thickness of the plating layer is relatively thinner, and the thickness of the plating layer is more stable and is not greatly changed along with dipping time.

Description

technical field [0001] The invention relates to a method for hot dipping aluminum-zinc alloy on the surface of iron and steel, belonging to the technical field of iron and steel hot dipping. Background technique [0002] Zinc, aluminum or zinc-aluminum alloy coating on the surface of steel is an effective method for corrosion protection, and the zinc-aluminum alloy coating has better corrosion resistance than zinc and aluminizing in many environments. At present, effective methods for obtaining an aluminized layer include hot-dip infiltration and powder infiltration, but both have the disadvantages of long process time and high treatment temperature. The higher processing temperature reduces the strength of the steel structure, and the longer processing time causes a huge waste of time and energy. The method of obtaining galvanizing and zinc-aluminum alloy generally adopts powder infiltration, and the process temperature of ordinary powder embedding method is high and the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C22C18/04
Inventor 岳增武郭凯李辛庚樊志彬王晓明闫风洁王学刚曹建梅翟季青
Owner STATE GRID CORP OF CHINA
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