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Method for suitable for batch quantity hot dipping zinc of rolled steel

A technology of hot-dip galvanizing and steel, applied in hot-dip galvanizing process, chemical variable control, non-electric variable control and other directions, can solve the problem of difficult to control the exact content, change, consumption speed of zinc bath, etc. The effect of large-scale production of hot-dip galvanizing, reducing the thickness of the coating and delaying the formation of white rust

Inactive Publication Date: 2008-07-16
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that during the hot dipping process, the consumption rate of various alloy elements in the zinc bath is not the same, resulting in changes in the composition of the zinc bath, and it is difficult to control the exact content of each added element in the zinc bath

Method used

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  • Method for suitable for batch quantity hot dipping zinc of rolled steel
  • Method for suitable for batch quantity hot dipping zinc of rolled steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The steel used for galvanizing is a steel plate containing 0.18% Si, and the chemical composition is shown in Table 1 below. The batch hot-dip galvanizing method adopted includes the following steps and process conditions:

[0023] (1) Binary master alloy refining: Weigh aluminum and zinc, magnesium and zinc, cerium and zinc in proportion by weight, place them in graphite crucibles, and refine them respectively. Among them: the aluminum content in the zinc-aluminum binary master alloy is 5%, the melting temperature of the zinc-aluminum master alloy is 680°C, and the holding time is 2 hours; the magnesium content in the zinc-magnesium binary master alloy is 4%, and the zinc-magnesium master alloy The smelting temperature of the zinc-cerium master alloy is 650°C, and the holding time is 4 hours; the cerium content in the zinc-cerium binary master alloy is 3.3%, and the melting temperature of the zinc-cerium master alloy is 760°C, and the holding time is 4 hours. After ea...

Embodiment 2

[0037] The steel used for galvanizing is a Q235 (0.22% Si) steel plate, which is hot-dip galvanized for 5 minutes in a pure zinc bath with a bath temperature of 450 ° C and an alloy zinc bath containing aluminum, magnesium and cerium. Wherein the hot-dip galvanizing in the alloy zinc bath comprises the following steps and process conditions:

[0038](1) Binary master alloy refining: by weight ratio) aluminum and zinc, magnesium and zinc, cerium and zinc are respectively placed in graphite crucibles and refined separately. Among them: the aluminum content in the zinc-aluminum binary master alloy is 4%, the melting temperature of the zinc-aluminum master alloy is 700°C, and the holding time is 1 hour; the magnesium content in the zinc-magnesium binary master alloy is 3.6%, and the zinc-magnesium master alloy The smelting temperature of the zinc-cerium master alloy is 680°C, and the holding time is 3 hours; the cerium content in the zinc-cerium binary master alloy is 3%, and the ...

Embodiment 3

[0043] The steel used for galvanizing is a Q235 (containing 0.22% Si) steel plate, which is hot-dip galvanized for 5 minutes in a pure zinc bath with a bath temperature of 450 ° C and an alloy zinc bath containing aluminum, magnesium and cerium. Wherein the hot-dip galvanizing in the alloy zinc bath comprises the following steps and process conditions:

[0044] (1) Binary master alloy refining: Weigh aluminum and zinc, magnesium and zinc, cerium and zinc in proportion by weight, place them in graphite crucibles, and refine them separately. Among them: the aluminum content in the zinc-aluminum binary master alloy is 4.8%, the melting temperature of the zinc-aluminum master alloy is 680°C, and the holding time is 2 hours; the magnesium content in the zinc-magnesium binary master alloy is 3%, and the zinc-magnesium master alloy The smelting temperature of the zinc-cerium master alloy is 680°C, and the holding time is 3 hours; the cerium content in the zinc-cerium binary master al...

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Abstract

The invention discloses a method suitable for the batching hot galvanizing of steel products and the batching hot galvanizing of the steel products is done in a zinc alloy plating bath which is prepared by three dualistic master alloys; the zinc alloy plating bath is provided with the compositions of aluminum content of 0.03 to 0.05 wt percent, magnesium content of 0.02 to 0.04 wt percent, cerium content of 0.03 to 0.06 wt percent and the allowance of zinc; the three dualistic master alloys have the composition formula that the zinc-aluminum dualistic master alloy has the aluminum content of 4 to 5wt percent and the allowance of zinc; the zinc-magnesium dualistic master alloy has the magnesium content of 3 to 5wt percent and the allowance of zinc; the zinc-corium dualistic master alloy has the corium content of 3 to 4wt percent and the allowance of zinc. The method is simple in process, easily controlled in the compositions of the alloy zinc bath; the method can effectively overcome the adverse effects of silicon on the plating in steel used in the hot galvanizing, reduce the thickness of the plating, improve the corrosion resistance of the plating without changing the original hot galvanizing devices and is good for the scale production of the batching hot galvanizing of steel products.

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] As one of the effective steel surface protection processes, hot-dip galvanizing is widely used in the protection of steel components. Hot-dip galvanizing is a process in which the cleaned and activated steel is immersed in liquid zinc, and an iron-zinc alloy phase layer is formed on the surface of the steel through the reaction and diffusion between iron and zinc. The hot-dip galvanized layer (including the alloy phase layer and the free zinc layer) isolates the contact between the steel material and the corrosive environment, and uses the characteristics of zinc as a sacrificial anode for steel to protect the steel material. [0003] Most of the existing steels for hot-dip galvanizing contain a certain amount of silicon. T...

Claims

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Application Information

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IPC IPC(8): C23C2/06C22C1/03G05D21/00C23G1/19C23G1/08
Inventor 许乔瑜栾向伟
Owner SOUTH CHINA UNIV OF TECH
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