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Surface pretreatment method for improving quality of malleable cast iron hot-dip galvanizing coating

A surface pretreatment, hot-dip galvanizing technology, applied in hot-dip plating process, coating, metal material coating process, etc. problems, to achieve the effect of reducing the thickness of the galvanized layer and improving the uniformity of the coating

Active Publication Date: 2019-12-27
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, the iron content in the galvanizing solution increases, and zinc slag is formed, which increases the viscosity of the galvanizing solution, and the fluidity of the alloy solution is significantly reduced. Thick zinc layer

Method used

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  • Surface pretreatment method for improving quality of malleable cast iron hot-dip galvanizing coating
  • Surface pretreatment method for improving quality of malleable cast iron hot-dip galvanizing coating
  • Surface pretreatment method for improving quality of malleable cast iron hot-dip galvanizing coating

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A malleable cast iron sample with a size of 10mm×10mm×4mm was buried in a sodium bicarbonate powder bed, and the surface was pretreated at 200°C for 60 minutes. -Drying treatment, and then immerse the malleable cast iron sample in the zinc alloy solution for 4 minutes, the composition of the hot-dip galvanizing alloy solution is also Zn-0.05wt.%Al, and the temperature of the zinc alloy solution is controlled at 460°C. Table 1 shows the thickness measurement results of the malleable cast iron coating before and after 60 minutes of sodium bicarbonate pretreatment at 200 °C. Quantitative metallographic analysis shows that the average thickness of the malleable cast iron coating is 86.5 μm, which is 15.2% less than that of the unpretreated sample. The coating thickness difference between the thickest part and the thinnest part is 118.4 μm, which is 20.3% less than the coating thickness difference between the thickest part and the thinnest part of the unpretreated sample, an...

Embodiment 2

[0032] A malleable cast iron sample with a size of 10mm×10mm×4mm was buried in a sodium bicarbonate powder bed, and the surface was pretreated at 300°C for 60 minutes. After taking it out, it was sequentially washed with alkali-washed-acidic-washed-assisted plating -Dry a series of treatments, zinc alloy solution and then immerse the malleable cast iron sample in the zinc alloy solution for 4 minutes. The composition of the hot-dip galvanized alloy solution is also Zn-0.05wt.%Al, and the temperature of the zinc alloy solution is controlled at 460°C. Table 2 shows the thickness measurement results of the malleable cast iron coating before and after 300°C sodium bicarbonate pretreatment for 60 minutes. Quantitative metallographic analysis shows that the average thickness of the malleable cast iron coating is 76.1 μm, which is 25.4% less than that of the unpretreated sample. The thickness difference between the thickest part and the thinnest part is 71.8 μm, which is 51.7% less t...

Embodiment 3

[0036] A malleable cast iron sample with a size of 10mm×10mm×3mm was buried in a sodium bicarbonate powder bed, and the surface was pretreated at 400°C for 60 minutes. -Dry a series of zinc alloy baths, and then immerse the malleable cast iron sample in the zinc alloy bath for 4 minutes. The composition of the hot-dip galvanized alloy bath is Zn-0.05wt.%Al, and the temperature of the zinc alloy bath is controlled at 460°C. Table 3 shows the thickness measurement results of the malleable cast iron coating before and after 400°C sodium bicarbonate pretreatment for 60 minutes. Quantitative metallographic analysis shows that the average thickness of the malleable cast iron coating is 81.3 μm, which is 20.3% less than that of the unpretreated sample. The coating thickness difference between the thickest part and the thinnest part is 61.2 μm, which is 58.9% less than that of the unpretreated sample between the thickest part and the thinnest part, and the coating uniformity is more o...

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Abstract

The invention belongs to the field of metal surface engineering, and particularly relates to a surface pretreatment method for improving the quality of a malleable cast iron hot-dip galvanizing coating. According to the main step of the surface pretreatment method, a malleable cast iron part is buried into a sodium bicarbonate powder bed, so that the malleable cast iron part is placed in an oxidizing atmosphere to be subjected to surface oxidizing pretreatment, and the aim of effectively inhibiting the activity of silicon on the surface of the cast iron part is achieved. Compared with malleable cast iron which is not pretreated. The plating thickness difference of different positions of the malleable cast iron part and the average thickness value are remarkably reduced, the plating qualityis obviously improved, and the surface pretreatment method has wide application prospects in the galvanization industry.

Description

technical field [0001] The invention belongs to the field of metal surface engineering, in particular to a surface pretreatment method for improving the quality of malleable cast iron hot-dip galvanized coating. Background technique [0002] In the traditional manufacturing industry, the hot-dip galvanizing method has a long history of development. As a relatively mature protection measure, it is widely used on the surface of metal parts such as high-voltage line towers exposed in the wild, street lamp poles and other metal parts in the urban atmospheric environment. corrosion protection. [0003] Hot-dip galvanized malleable cast iron is usually used in hot-dip galvanized pipe fittings. Hot-dip galvanized pipe fittings include galvanized elbows, galvanized flanges, galvanized elbows, galvanized reducers, galvanized pipe caps, etc. During the hot-dip galvanizing process, the alloy thermodynamic and kinetic reactions occur between the pipe fitting substrate and the zinc liqu...

Claims

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Application Information

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IPC IPC(8): C23C2/02C23C2/06
CPCC23C2/02C23C2/06
Inventor 王建华吴悔刘亚吴长军苏旭平
Owner CHANGZHOU UNIV
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