Two-step SuperDyma alloy hot dipping technology for structural steel

A technology for structural steel and alloy, which is applied in the field of two-step hot-dip SuperDyma alloy plating on structural steel, to achieve the effects of good coating quality, lower production costs, and easy control of coating quality

Inactive Publication Date: 2017-03-22
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there are no research reports and published patents on pre-plating pure zinc on structural steel and then dip-coating SuperDyma alloy

Method used

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  • Two-step SuperDyma alloy hot dipping technology for structural steel
  • Two-step SuperDyma alloy hot dipping technology for structural steel
  • Two-step SuperDyma alloy hot dipping technology for structural steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] First, two crucibles filled with pure zinc and SuperDyma alloy with Zn-11 wt.%Al-3 wt.% Mg-0.2 wt.%Si were placed in a pit furnace and heated to 450°C and kept at a constant temperature.

[0023] Surface cleaning of Q195 structural steel → degreasing with 15% NaOH solution at 70-90°C → washing with water → pickling with 10-15% hydrochloric acid solution → washing with water → 200g / L NH with a weight ratio of 1.2:1 at 70-90°C 4 Cl-ZnCl 2 Help plating in aqueous solution→drying after treatment, immerse in 450℃ pure zinc bath for pre-plating for 10s, take it out and place it in 450℃ SuperDyma alloy bath for 10s, 20s, 30s, 60s, 90s and 120s, and finally Remove from water to cool.

[0024] The surface quality of the obtained plated parts is very good. figure 2 shown. The cross-sectional structure of the obtained coating is as follows image 3 shown. According to the analysis of scanning electron microscope and energy dispersive analyzer, it is found that the Fe with a ...

Embodiment 2

[0026] It is basically the same as Example 1, except that: after pretreatment, the Q195 steel is pre-coated in a pure zinc bath at 450°C for 5 seconds, and then dip-coated in a SuperDyma alloy bath at 450°C for 10 seconds and 20 seconds respectively. 30s and 60s and then take out the water to cool.

[0027] The microstructure of the coating obtained after pre-plating for 5 s and dipping for 10 is as follows Figure 4 shown. Its Fe 2 Al 5 Zn x The thickness of the mixed layer with the liquid phase becomes thinner, and the coating is mainly formed by the solidified structure of the SuperDyma alloy liquid in the outer layer. That is to say, by shortening the time of pre-plating pure zinc, the Fe 2 Al 5 Zn x The thickness of the mixed layer with the liquid phase, and then the total thickness of the coating is controlled by controlling the amount of alloy liquid.

Embodiment 3

[0029] It is basically the same as Example 1, except that: after pretreatment, the Q195 steel is pre-coated in a pure zinc bath at 430°C for 10 s, and then dip-coated in a SuperDyma alloy bath at 450°C for 10 s and 20 s respectively. , 30s and 60s and then take out the water to cool.

[0030] The microstructure of the coating obtained after pre-plating for 10 s and dipping for 10 s is as follows Figure 5 shown. Its coating structure is basically the same as that in Example 1, except that Fe 2 Al 5 Zn xThe thickness of the mixed layer with the liquid phase is thinner than that after immersion plating at 450°C for the same time.

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Abstract

The invention belongs to the technical field of hot dipping and relates to a two-step SuperDyma alloy hot dipping technology for structural steel. The technology sequentially comprises degreasing, water washing, acid pickling, water washing, dipping assisting, drying, pure zinc preheating and dipping, SuperDyma alloy hot dipping and cooling. After being pretreated by a common massive hot galvanizing method, a workpiece is dipped in a 430-470DEG C pure zinc bath for 2-30s and then dipped in a 430-470DEG C SuperDyma alloy bath which is arranged with the pure zinc bath side by side for 5-120s. The surface of an obtained alloy coating is great in quality, even in thickness and great in mechanical performance, the corrosion resistance of the alloy coating is more than 10 times of a common pure zinc coating, and the service life is long. The problems that silicon reacts when the structural steel is hot-dipped with pure zinc and the surface quality of a coating only coated with SuperDyma alloy is poor are overcome, and the use of an unstable dipping assistant is avoided. Under the condition of obtaining the same workpiece service life, the thickness of the coating can be reduced, hop dipping time is shortened, and the production cost is reduced. The technology is stable, and the quality of the coating is easy to control.

Description

technical field [0001] The invention belongs to the technical field of hot-dip plating, and in particular relates to a two-step hot-dip SuperDyma alloy process for structural steel. Background technique [0002] Hot-dip galvanizing is an effective method of steel surface protection. Batch hot-dip galvanizing is a process in which the cleaned and activated steel is immersed in liquid zinc, and an iron-zinc intermetallic compound layer is formed on the surface of the steel through the reaction and diffusion between iron and zinc. The hot-dip pure zinc coating includes an intermetallic compound layer and a free zinc layer, which forms a protective oxide film in the air, isolates the steel material from contact with the corrosive environment, and utilizes the characteristics of zinc’s sacrificial anodic protection for steel. The steel material plays a protective role. However, the silicon present in structural steel parts will produce silicon reactivity during hot-dip galvaniz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06
CPCC23C2/06
Inventor 吴长军曾姣凤苏旭平刘亚彭浩平王建华
Owner CHANGZHOU UNIV
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