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Method for hot dipping of composite zinc coating on surface of steel and steel coating composite material

A technology of steel surface and zinc coating, applied in hot-dip coating process, metal material coating process, coating, etc., can solve the problems of increased zinc consumption, ineffective solution, complex composition, etc., and achieve the effect of high density

Pending Publication Date: 2021-01-29
GUANGDONG INST OF MATERIALS & PROCESSING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] But, there are following two problems in batch hot-dip plating of Zn-Al and Zn-Al-Mg alloy melt: (1) can't obtain continuous dense coating on steel surface, this becomes Zn-Al and Zn-Al-Mg Limiting factors for the application of coatings in the field of batch hot-dip coating; (2) This type of coating is thinner. Compared with pure zinc coatings, although it plays a role in saving resources, it does not significantly improve the overall service life of steel materials. Not even as good as overall protection of thicker pure zinc coatings
Therefore, this type of special additive has the following disadvantages: (1) it cannot meet the requirements of environmental protection; (2) it is difficult to maintain due to the complex composition; Corrosion dissolves quickly during plating, and a large amount of iron ions will be brought into the hot-dip galvanizing bath through the plating process, which will significantly increase the amount of zinc dross and zinc ash, resulting in increased zinc consumption, resulting in waste of resources and increased production costs.
[0006] Visible, for Zn-Al and Zn-Al-Mg alloy melt two problems existing in hot-dip plating in batches have not solved effectively at present, propose this application in view of this

Method used

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  • Method for hot dipping of composite zinc coating on surface of steel and steel coating composite material
  • Method for hot dipping of composite zinc coating on surface of steel and steel coating composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] This embodiment provides a method for hot-dipping composite zinc coating on steel surface, which adopts figure 1 The process steps in the preparation of high corrosion resistance Zn-3Al alloy coating, the process is degreasing→water washing→pickling→water washing→plating help→drying→hot-dip pure zinc plating→cooling→hot-dip Zn-3Al alloy→cooling . details as follows:

[0044] (1) Place the low-silicon steel sheet (5cm×4cm×3mm) in NaOH solution (concentration: 20wt%) to degrease for 2min, the degreasing temperature is 70°C, and rinse with water after degreasing.

[0045] (2) Place the low-silicon steel sheet rinsed in step (1) in hydrochloric acid with a concentration of 15wt% for 5 minutes to pickle and remove rust, and rinse with water after rust removal.

[0046] (3) Soak the low-silicon steel test piece rinsed in step (2) in a 70°C fluxing solution (100g / L NH 4 Cl, 90g / LZnCl 2 , and the rest is water) for 2 minutes, take it out and dry it.

[0047] (4) Soak the l...

Embodiment 2

[0051] This embodiment provides a method for hot-dipping composite zinc coating on steel surface, which adopts figure 1 The process steps in the preparation of high corrosion resistance Zn-7Al alloy coating, the process is degreasing→water washing→pickling→water washing→plating help→drying→hot-dip pure zinc plating→cooling→hot-dip Zn-7Al alloy→cooling . details as follows:

[0052] (1) Place the low-silicon steel sheet (5cm×4cm×3mm) in NaOH solution (concentration: 20wt%) to degrease for 2min, the degreasing temperature is 70°C, and rinse with water after degreasing.

[0053] (2) Place the low-silicon steel sheet rinsed in step (1) in hydrochloric acid with a concentration of 15wt% for 5 minutes to pickle and remove rust, and rinse with water after rust removal.

[0054] (3) Soak the low-silicon steel test piece rinsed in step (2) in a 70°C fluxing solution (100g / L NH 4 Cl, 90g / LZnCl 2 , and the rest is water) for 2 minutes, take it out and dry it.

[0055] (4) Soak the l...

Embodiment 3

[0059] This embodiment provides a method for hot-dipping composite zinc coating on steel surface, which adopts figure 1 The process steps in the preparation of high corrosion resistance Zn-5Al alloy coating, the process is degreasing→water washing→pickling→water washing→plating help→drying→hot-dip pure zinc plating→cooling→hot-dip Zn-5Al alloy→cooling . details as follows:

[0060] (1) Place the low-silicon steel sheet (5cm×4cm×3mm) in NaOH solution (concentration: 20wt%) to degrease for 2min, the degreasing temperature is 70°C, and rinse with water after degreasing.

[0061] (2) Place the low-silicon steel sheet rinsed in step (1) in hydrochloric acid with a concentration of 15wt% for 5 minutes to pickle and remove rust, and rinse with water after rust removal.

[0062] (3) Soak the low-silicon steel test piece rinsed in step (2) in a 70°C fluxing solution (100g / L NH 4 Cl, 90g / LZnCl 2 , and the rest is water) for 2 minutes, take it out and dry it.

[0063] (4) Soak the l...

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Abstract

The invention discloses a method for hot dipping of a composite zinc coating on the surface of steel and a steel coating composite material, and relates to the field of corrosion protection. The method for hot dipping of the composite zinc coating on the surface of the steel comprises the steps that primary dip plating is carried out on the steel in a zinc bath, and then secondary dip plating is carried out in an alloy bath with a melting point lower than the melting point of pure zinc; and the alloy bath contains zinc and aluminum elements, and a mixed melting point of the alloy bath is lowerthan the melting point of the pure zinc. According to the method for hot dipping of the composite zinc coating on the surface of the steel and the steel coating composite material, primary dip plating is creatively carried out in the zinc bath and then secondary dip plating is carried out in the alloy bath with the melting point lower than the melting point of the pure zinc, the secondary dip plating is equivalent to replacement of other elements except zinc in the alloy bath to form a pure zinc plating layer, a plating layer material with larger thickness and high corrosion resistance can beobtained, and the method is suitable for batch hot dipping of steel surfaces.

Description

technical field [0001] The invention relates to the field of corrosion protection, and in particular to a method for hot-dipping a composite zinc coating on the surface of steel and a steel coating composite material. Background technique [0002] The construction of many major projects needs to consume a large amount of steel materials, and basic steel materials are prone to corrosion damage and failure in the service environment. Good corrosion protection for basic steel materials is the key to ensuring the long-term safe and effective operation of these major projects. And the key link of energy saving and cost reduction. Hot-dip galvanizing anti-corrosion technology is the most effective and economical method to improve the corrosion resistance of steel materials, but with the diversification and complexity of the service environment of steel materials, especially for major engineering steel components that require long-term corrosion protection in complex environments, ...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/02
CPCC23C2/06C23C2/02
Inventor 王彦启
Owner GUANGDONG INST OF MATERIALS & PROCESSING
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