Hot dip galvanizing additive

A hot-dip galvanizing and additive technology, applied in the field of hot-dip galvanizing additives, can solve problems such as human health hazards, poor fluidity of zinc liquid, product sales restrictions, etc., to expand sales range, ensure quality and corrosion resistance, and improve flow performance effect

Inactive Publication Date: 2012-12-12
靖江市大通标准件厂
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  • Abstract
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AI Technical Summary

Problems solved by technology

But too much lead will cause harm to human health, and product sales are restricted
Now some hot-dip galvanizing enterprises no longer use PW-grade zinc ingots in order to make products have a good zinc layer thickness, improve product corrosion resistance, and meet environmental protection requirements. Most of them use SHG-grade zinc ingots. The concentration of lead in this zinc ingot Less than 0.003%, because the concentration of lead is too low, zinc slag cannot be precipitated, the fluidity of zinc liquid is poor, and the quality of hot-dip galvanized products cannot be guaranteed

Method used

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Embodiment Construction

[0009] A hot-dip galvanizing additive, consisting of zinc-bismuth multi-element alloy, is characterized in that: the content of each element is 98.5-99.5% by weight of zinc; 0.35-0.40% of bismuth; 0.42-0.48% of rare earth and other elements; adding zinc-bismuth multi-element The temperature during alloying is generally controlled at 440°C-460°C; the amount of the zinc-bismuth multi-element alloy added accounts for 5-10% of the amount of zinc ingots required for hot-dip galvanizing.

[0010] In specific implementation, the bottom dross needs to be removed before heating the galvanizing additive for the first time, and the hot-dip galvanizing additive is added evenly with a hanging basket. When adding, the temperature of the zinc solution is generally controlled at 440°C-460°C to reduce temperature fluctuations and ensure the quality of the coating. The invention improves the fluidity of the zinc solution in the galvanizing process, reduces the thickness of the coating, reduc...

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Abstract

The invention provides a hot dip galvanizing additive which is composed of zinc-bismuth multi-element alloy and comprises the following elements expressed in weight percentage: 98.5 to 99.5% of zinc, 0.35 to 0.40% of bismuth and 0.42 to 0.48% of rare earth and other elements. Temperature is controlled to be in a range of 440 DEG C to 460 DEG C when the zinc-bismuth multi-element alloy is added; the addition amount of the zinc-bismuth multi-element alloy accounts for 5 to 10% of the amount of zinc ingots needed in hot dip galvanizing. The hot dip galvanizing additive provided by the invention greatly improves flowing properties of zinc liquid, guarantees the quality and corrosion resistance of a product, is green and environment friendly and expands the sale range of the product.

Description

[0001] Technical field: [0002] The invention relates to a hot dip galvanizing additive. Background technique: [0003] At present, most hot-dip galvanizing enterprises use PW-grade zinc ingots with a lead concentration of about 1%. A layer of lead is placed on the bottom of the zinc pot to remove zinc dross, prevent the zinc dross from adhering to the bottom of the pot, and prolong the service life of the zinc pot. , and the fluidity of the zinc liquid is good, and the product quality is guaranteed. But too much lead can cause harm to human health, and product sales are restricted. Now some hot-dip galvanizing enterprises no longer use PW-grade zinc ingots in order to make products have a good zinc layer thickness, improve product corrosion resistance, and meet environmental protection requirements. Most of them use SHG-grade zinc ingots. The concentration of lead in this zinc ingot Less than 0.003%, because the concentration of lead is too low, zinc slag cannot ...

Claims

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Application Information

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IPC IPC(8): C23C2/06
Inventor 倪江明
Owner 靖江市大通标准件厂
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