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Method for reducing silicon reactivity of hot-dip galvanization of malleable cast iron

A hot-dip galvanizing, reactive technology, applied in hot-dip galvanizing process, coating, metal material coating process, etc., can solve the problems of increasing the viscosity of the galvanizing solution, intensifying the reaction, and thickening the galvanized layer.

Active Publication Date: 2019-05-14
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, a higher galvanizing temperature should be used. At this time, the zinc-iron reaction is intensified, and the amount of iron in the galvanizing solution increases, forming zinc dross, which increases the viscosity of the galvanizing solution, so the galvanized layer is thicker.

Method used

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  • Method for reducing silicon reactivity of hot-dip galvanization of malleable cast iron
  • Method for reducing silicon reactivity of hot-dip galvanization of malleable cast iron
  • Method for reducing silicon reactivity of hot-dip galvanization of malleable cast iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] As a reference hot-dip galvanized sample, the malleable cast iron with a size of 10mm×10mm was subjected to a series of treatments of alkali washing-water washing-acid washing-water washing-assisted plating-drying, and the composition of the hot-dip galvanizing alloy solution was Zn-0.05wt. % Al, the temperature of the zinc solution is controlled at 460°C, and the malleable cast iron sample is immersed in the zinc solution for 4 minutes. Quantitative metallographic analysis shows that the average thickness of the coating on the malleable cast iron sample is 102 μm, and the thickness difference between the thickest part and the thinnest part is 148.6 μm.

[0026] Table 1 Thickness of galvanized layer on malleable cast iron after dip-plating in 460℃ zinc solution for 4 minutes (μm)

[0027]

[0028] In the present invention, a 10mm×10mm malleable cast iron surface is pretreated for 60 minutes with a 30% aqueous hydrogen peroxide solution, and after taking it out, it is...

Embodiment 2

[0030] As a reference hot-dip galvanized sample, a malleable cast iron with a size of 10mm×10mm was subjected to a series of treatments of alkali washing-water washing-acid washing-water washing-assisted plating-drying (the processing steps are the same as in Example 1) hot-dip galvanized alloy The composition of the solution is Zn-0.05wt.% Al, the temperature of the zinc solution is controlled at 510° C., and the malleable cast iron sample is dipped in the zinc solution for 4 minutes. Quantitative metallographic analysis shows that the average thickness of the coating on the malleable cast iron sample is 108.6 μm, and the thickness difference between the thickest part and the thinnest part is 101.7 μm.

[0031] Table 2 Thickness of galvanized layer of malleable cast iron after immersion plating in 510℃ zinc solution for 4 minutes (μm)

[0032]

[0033] In the present invention, a 10mm×10mm malleable cast iron surface is pretreated for 60 minutes with a 30% aqueous hydrogen...

Embodiment 3

[0035] As a reference hot-dip galvanized sample, a malleable cast iron with a size of 10mm×10mm was subjected to a series of treatments of alkali washing-water washing-acid washing-water washing-assisted plating-drying (the treatment steps are the same as in Example 1). The composition of the hot-dip galvanizing alloy liquid is Zn-0.05wt.% Al, the temperature of the zinc liquid is controlled at 560°C, and the malleable cast iron sample is immersed in the zinc liquid for 4 minutes. Quantitative metallographic analysis shows that the average thickness of the coating on the malleable cast iron sample is 163.8 μm, and the thickness difference between the thickest part and the thinnest part is 267.6 μm.

[0036] Table 3 Thickness of galvanized layer of malleable cast iron after dip-plating in 560℃ zinc solution for 4 minutes (μm)

[0037]

[0038] In the present invention, a 10mm×10mm malleable cast iron surface is pretreated for 60 minutes with a 30% aqueous hydrogen peroxide sol...

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Abstract

The invention belongs to the field of metal surface engineering, and particularly relates to a method for reducing the silicon reactivity of hot-dip galvanization of the malleable cast iron. An aqueous hydrogen peroxide solution with concentration of 25-35% is adopted to process the surface of the malleable cast iron, activity of silicon is effectively reduced, and then hot-dip galvanization is conducted in Zn-0.05wt.% Al alloy liquid at 450-570DEG C. The galvanization can be lowered, thickness of a clad layer of the malleable cast iron can be effectively reduced, and thickness uniformity of the clad layer of the malleable cast iron is obviously improved.

Description

technical field [0001] The invention belongs to the field of metal surface engineering, in particular to a method for alleviating the reactivity of malleable cast iron hot-dip galvanized silicon. Background technique [0002] Hot-dip galvanized malleable cast iron is mainly used in hot-dip galvanized pipe fittings. Hot-dip galvanized pipe fittings include galvanized elbows, galvanized flanges, galvanized elbows, galvanized reducers, and galvanized pipe caps. During the hot-dip plating process, complex physical and chemical reactions occur between the pipe fitting substrate and the molten plating solution to form a corrosion-resistant zinc-iron alloy layer with a tight structure. The alloy layer is integrated with the pure zinc layer and the iron matrix, so it has strong corrosion resistance. Hot-dip galvanized pipe fittings are mainly used for gas, heating and other pipeline projects. For example, the steel pipe body needs to be galvanized for anti-corrosion treatment, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/02C23C2/06
Inventor 王建华吴悔吴长军彭浩平苏旭平
Owner CHANGZHOU UNIV
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