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Method of constructing highly corrosion-resistant zinc alloy double-coating on surface of steel product

A zinc alloy, high corrosion resistance technology, applied in metal material coating process, coating, hot-dip plating process, etc., can solve problems such as difficult plating, to prolong service life, process stability, improve coating corrosion resistance effect Effect

Inactive Publication Date: 2018-04-13
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a method for constructing a high-corrosion-resistant zinc alloy double coating on the surface of steel, which can not only solve the problem of high-aluminum (Al>1%) high-corrosion-resistant zinc alloy coating difficult to help plating, but also can Obtaining the dual protective effect of galvanized layer and high-corrosion-resistant zinc alloy coating can promote the application of high-corrosion-resistant zinc alloy technology in batch hot-dip galvanizing

Method used

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  • Method of constructing highly corrosion-resistant zinc alloy double-coating on surface of steel product
  • Method of constructing highly corrosion-resistant zinc alloy double-coating on surface of steel product
  • Method of constructing highly corrosion-resistant zinc alloy double-coating on surface of steel product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Take the pre-plating of pure zinc coating and then Galfan coating as an example. process such as figure 2 As shown, the technological process for preparing a high corrosion-resistant Galfan alloy layer is degreasing, water washing, pickling, water washing, fluxing, drying, hot-dip pure zinc plating, cooling, hot-dip Galfan alloy plating, and cooling. The details of each process are as follows:

[0035] (1) Hang the 08F low-silicon steel test piece (3cm×4cm×2mm), then place it in a 70°C, 20wt% NaOH solution for degreasing for 2 minutes, and then rinse it with 80°C hot water;

[0036](2) Soak the low-silicon steel test piece washed in step (1) in hydrochloric acid with a concentration of 15wt% for 5 minutes, and then rinse it with water;

[0037] (3) Soak the low-silicon steel test piece rinsed in step (2) in a 70°C fluxing solution (15wt% NH 4 Cl, 15 wt% ZnCl 2 , and the rest is water) for 1 min, then take it out and dry it;

[0038] (4) Soak the low-silicon steel ...

Embodiment 2

[0043] Take the pre-plating of pure zinc coating and then Galfan coating as an example. process such as figure 2 As shown, the technological process for preparing a high corrosion-resistant Galfan alloy layer is degreasing, water washing, pickling, water washing, fluxing, drying, hot-dip pure zinc plating, cooling, hot-dip Galfan alloy plating, and cooling. The details of each process are as follows:

[0044] (1) Hang the 08F low-silicon steel test piece (3cm×4cm×2mm), then place it in a 70°C, 20wt% NaOH solution for degreasing for 2 minutes, and then rinse it with 80°C hot water;

[0045] (2) Soak the low-silicon steel test piece washed in step (1) in hydrochloric acid with a concentration of 15wt% for 5 minutes, and then rinse it with water;

[0046] (3) Soak the low-silicon steel test piece rinsed in step (2) in a 70°C fluxing solution (15wt% NH 4 Cl, 15 wt% ZnCl 2 , and the rest is water) for 1 min, then take it out and dry it;

[0047] (4) Soak the low-silicon steel...

Embodiment 3

[0051] Take the pre-plating of pure zinc coating and then Galfan coating as an example. process such as figure 2 As shown, the technological process for preparing a high corrosion-resistant Galfan alloy layer is degreasing, water washing, pickling, water washing, fluxing, drying, hot-dip pure zinc plating, cooling, hot-dip Galfan alloy plating, and cooling. The details of each process are as follows:

[0052] (1) Hang the 08F low-silicon steel test piece (3cm×4cm×2mm), then place it in a 70°C, 20wt% NaOH solution for degreasing for 2 minutes, and then rinse it with 80°C hot water;

[0053] (2) Soak the low-silicon steel test piece washed in step (1) in hydrochloric acid with a concentration of 15wt% for 5 minutes, and then rinse it with water;

[0054] (3) Soak the low-silicon steel test piece rinsed in step (2) in a 70°C fluxing solution (15wt% NH 4 Cl, 15 wt% ZnCl 2 , and the rest is water) for 1 min, then take it out and dry it;

[0055] (4) Soak the low-silicon steel...

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Abstract

The invention discloses a method of constructing a highly corrosion-resistant zinc alloy double-coating on the surface of a steel product. The method comprises the technological steps of degreasing, water washing, pickling, water washing, assisted plating, drying, hot dipping in pure zinc, cooling, hot dipping in a highly corrosion-resistant zinc alloy, and cooling sequentially. The highly corrosion-resistant zinc alloy is an alloy with a relatively low melting point and high coating corrosion resistance for the hot dipping. The surface of the steel product is subjected to pre-treatment of plating by adopting a conventional batch hot-dip galvanizing process, and after being subjected to hot-dip galvanizing in a 435-460 DEG C pure zinc bath, the surface of the steel product is directly placed in or is cooled and then placed in a 385-450 DEG C alloy bath for dip plating for 5-120 s, and then is cooled. By adopting the method, the problems that the probability of skip plating is high, a coating is thin (less than 20 m) and the surface quality of the coating is poor when steel is directly put in a dip plating aluminum-zinc (the content of Al is greater than 1%) alloy bath are solved, the corrosion resistance of the steel product is improved significantly and the service life is prolonged substantially due to a constructed double-coating superimposed structure, the method is stablein technology, and the coating quality 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 method for constructing a high-corrosion-resistant zinc alloy double coating on the surface of steel. Background technique [0002] Hot-dip galvanizing technology is widely used in the protection of steel materials, and it is one of the most simple and effective protection methods for steel surface protection. Hot-dip galvanizing is a process in which the cleaned and activated steel is immersed in liquid zinc, and an iron-zinc alloy phase layer is formed on the surface of the steel through the reaction and diffusion between iron and zinc. Typical conventional hot-dip galvanized coatings include alloy phase layers ( Γ Mutually, δ Related z Phase) and a free zinc layer, this coating can isolate the contact between the steel material and the corrosive environment, and use the characteristics of zinc as a sacrificial anode for steel to protect the steel mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/02
CPCC23C2/02C23C2/06
Inventor 孔纲翁天宇王彦启曹祖军车淳山赖德林万先兰
Owner SOUTH CHINA UNIV OF TECH
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