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Method adapting to batch quantity hot dipping zinc of rolled steel

A technology of hot-dip galvanizing and steel, applied in chemical variable control, non-electric variable control, multiple fluid ratio control, etc. The formation of white rust, reducing the thickness of the coating, and facilitating the large-scale production of batch hot-dip galvanizing

Inactive Publication Date: 2009-08-26
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 adapting to batch quantity hot dipping zinc of rolled steel
  • Method adapting to batch quantity hot dipping zinc of rolled steel
  • Method adapting to 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 separately. 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 each...

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) Refining of binary master alloys: Weigh aluminum and zinc, magnesium and zinc, cerium and zinc 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%, the smelting temperature of the zinc-aluminum master alloy is 700 ℃, 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 is 3.6%. The smelting temperature is 680°C, and the holding time is 3 hours; the cerium content in the zinc-cerium binary master alloy is 3%, the melting temperature of the zin...

Embodiment 3

[0043] The steel used for galvanizing is Q235 (containing 0.22% Si) steel sheet, and the test was conducted by hot-dip galvanizing for 5 minutes in a pure zinc bath with a coating bath temperature of 450° C. and an alloy zinc bath containing aluminum, magnesium and cerium. The hot-dip galvanizing in the alloy zinc bath includes the following steps and process conditions:

[0044] (1) Refining of binary master alloys: Weigh aluminum and zinc, magnesium and zinc, cerium and zinc 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 smelting 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 is 3%. The smelting temperature is 680°C, and the holding time is 3 hours; the cerium content in the zinc-cerium binary master alloy is 4%, th...

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Abstract

The invention discloses a batch hot-dip galvanizing method for steel materials. The steel materials are subjected to batch hot-dip galvanizing in a zinc alloy plating bath prepared from three kinds of binary intermediate alloys. The composition formula of the zinc alloy plating bath is: containing 0.03-0.05wt% of aluminum, 0.02-0.04wt% of magnesium, 0.03-0.06wt% of cerium, and the rest is zinc. The composition formulas of the three binary master alloys are as follows: in the zinc-aluminum binary master alloy, the aluminum content is 4-5wt%, and the rest is zinc; in the zinc-magnesium binary master alloy, the magnesium content is 3-5wt%, and the rest is zinc; In the zinc-cerium binary master alloy, the content of cerium is 3-4wt%, and the rest is zinc. The process is simple, the composition of the alloy zinc bath is easy to control, it can effectively overcome the adverse effect of silicon in the steel for hot-dip galvanizing on the coating, reduce the thickness of the coating, and improve the corrosion resistance of the coating without changing the original hot-dip galvanizing equipment. It is beneficial to the large-scale production of steel batch hot-dip galvanizing.

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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Patent Type & Authority Patents(China)
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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