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Method for steel product batch hot dip galvanizing

A hot-dip galvanizing and steel technology, applied in hot-dip plating process, metal material coating process, coating and other directions, can solve the problem of inability to suppress the ultra-thick growth of silicon-containing active steel coating, the promotion and application of zinc-manganese alloy coating, Improve the production cost of zinc-nickel master alloys, and achieve the effects of inhibiting super-thick growth, delaying the formation of white rust, and eliminating cluttered and uneven colors.

Inactive Publication Date: 2009-07-08
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, zinc-aluminum alloy can obtain a bright coating on the surface, but it cannot inhibit the ultra-thick coating growth of silicon-containing active steel, and zinc-nickel alloy can inhibit the ultra-thick coating growth of silicon-containing active steel, but due to the higher price of nickel, the Production cost of zinc-nickel master alloy
[0003] Adding low-cost manganese to the zinc bath can also effectively inhibit the super-thick coating growth of silicon-containing active steel, but although the obtained zinc-manganese alloy coating has better corrosion resistance and appropriate thickness, the oxide film on the coating surface It is thicker, the color is messy and uneven, and the color is gray, which affects the appearance of the coating
Therefore, the promotion and application of zinc-manganese alloy coatings is limited

Method used

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  • Method for steel product batch hot dip galvanizing
  • Method for steel product batch hot dip galvanizing
  • Method for steel product batch hot dip galvanizing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The steel used for galvanizing is a steel plate containing 0.10% Si, and the chemical composition is shown in Table 1 below. The hot-dip galvanizing method includes the following steps and process conditions:

[0022] (1) Binary master alloy refining: Weigh manganese and zinc, cerium and zinc in proportion by weight, place them in graphite crucibles, and refine them respectively. Among them: the manganese weight content in zinc-manganese binary master alloy is 3%, the melting temperature of zinc-manganese master alloy is 800 ℃, and the holding time is 3 hours; the cerium weight content in zinc-cerium binary master alloy is 2.6%, zinc cerium The melting temperature of the master alloy is 770°C, and the holding time is 2.5 hours. After each intermediate alloy liquid is kept warm, it is stirred, left still and the ash on the surface of the alloy liquid is removed, and then poured into an intermediate alloy ingot.

[0023] (2) Preparation of zinc bath components: Melt the...

Embodiment 2

[0037] The steel used for galvanizing is Q235 containing (0.22% Si) steel plate, and the method adopted comprises the following steps and process conditions:

[0038](1) Binary master alloy refining: Weigh manganese and zinc, cerium and zinc in proportion by weight, place them in graphite crucibles, and refine them respectively. Among them: the manganese content in the zinc-manganese binary master alloy is 2%, the melting temperature of the zinc-manganese master alloy is 790°C, and the holding time is 3 hours; the cerium content in the zinc-cerium binary master alloy is 3%, and the zinc-cerium master alloy The smelting temperature is 760°C, and the holding time is 3 hours. After each intermediate alloy liquid is kept warm, it is stirred, left still and the ash on the surface of the alloy liquid is removed, and then poured into an intermediate alloy ingot.

[0039] (2) Preparation of zinc bath components: Melt the zinc in the zinc pot and keep the temperature at 445°C, then ad...

Embodiment 3

[0043] The steel used for galvanizing is a Q235 containing (0.22% Si) steel plate, and the method adopted comprises the following steps and process conditions:

[0044] (1) Binary master alloy refining: Weigh manganese and zinc, cerium and zinc in proportion by weight, place them in graphite crucibles, and refine them respectively. Among them: the manganese content in the zinc-manganese binary master alloy is 2.5%, the melting temperature of the zinc-manganese master alloy is 780°C, and the holding time is 4 hours; the cerium content in the zinc-cerium binary master alloy is 2%, and the zinc-cerium master alloy The smelting temperature is 780°C, and the holding time is 2 hours. After each intermediate alloy liquid is kept warm, it is stirred, left still and the ash on the surface of the alloy liquid is removed, and then poured into an intermediate alloy ingot.

[0045] (2) Preparation of zinc bath components: Melt the zinc in the zinc pot and keep the temperature at 455°C, th...

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Abstract

The invention discloses a method applicable to rolled-steel lot-quantity hot dipping zinc, namely, performing lot-quantity hot dipping zinc to rolled steels in a zinc alloy plating bath formulated by two kinds of binary intermediate alloy. The zinc alloy plating bath comprises the following components: manganese of 0.3%-0.5%, cerium of 0.005%-0.03% and zincium of the rest, and the two kinds of binary intermediate alloy comprise a zincium-manganese binary intermediate alloy comprising manganese of 2%-3% and zincium of the rest; a zincium-cerium binary intermediate alloy comprising cerium of 2%-3% and zincium of the rest.The invention has advantages of simple alloy coating technique, easy controlling of components of alloy zincium bath; effective control of super-thick growth of the coating layer of silicon-contained reactive steel, improvement of corrosion resistance capability of the coating layer, great delaying of the generation of white rust, elimination of disorder inhomogenous color on the coating layer surface of zincium-manganese alloy for obtaining more bright and smooth coating layers; reduced production cost by because of adopting cheap alloy elements; simple technique without changing original hot dipping zinc equipment, which is propitious to scale-production of lot quantity hot dipping zinc of rolled steels.

Description

technical field [0001] The invention belongs to the technical field of steel hot-dip galvanized alloy. More specifically, the present invention relates to a method suitable for batch hot-dip galvanizing of steel materials. Background technique [0002] Because of its high strength, good ductility and many other advantages, steel is the most productive and widely used metal material in the world, but its disadvantage is that it is easy to corrode. Hot-dip galvanizing is one of the most traditional and reliable metal protection methods. At present, most of the steels used for hot-dip galvanizing are killed steels and semi-killed steels (called active steels) with high silicon content. The presence of silicon in steel will affect the growth of each phase layer in the coating, causing the coating to appear gray, super thick and poor in adhesion, which greatly reduces the appearance quality and performance of the coating. In recent years, in order to solve the problem of over-...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/02
Inventor 许乔瑜曾秋红
Owner SOUTH CHINA UNIV OF TECH
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