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Method for hot-dipping composite coating on steel

A composite coating and hot-dip coating technology, applied in hot-dip coating process, metal material coating process, coating, etc., to achieve the effect of solving missing plating, reducing zinc consumption, and high corrosion resistance

Active Publication Date: 2022-03-04
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problems existing in the prior art, the object of the present invention is to provide a method for hot dipping composite coating on steel, said method forms composite coating on the surface by hot dip coating steel, improves its anticorrosion ability, effectively It solves the problems of missed plating, nodules or blisters in the traditional hot-dip plating method, and has simple operation, low cost, good economic benefits, is conducive to industrial scale production, and has a good industrial application prospect

Method used

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Examples

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Embodiment 1

[0081] The steel used in this embodiment is 40mm×40mm×0.6mm SPHC steel plate, and a hole with a diameter of 4mm is drilled at one end of the steel plate, and iron wire is inserted to make a test piece. The specific chemical composition is shown in Table 1.

[0082] This embodiment provides a method for hot-dipping composite coatings on steel, said method comprising the following steps:

[0083] (1) First, pretreat the steel, place the steel in an alkaline washing solution, wash at 80°C for 5 minutes, the alkaline washing solution includes 100g / L of sodium hydroxide and 100g / L of sodium carbonate, and then wash with water , and then placed in the pickling solution, cleaned at 35°C for 3 minutes, the pickling solution included hexamethylenetetramine 3g / L and hydrochloric acid 1.2mol / L, and then washed with water; the pretreated steel was Flux plating at 80°C for 0.5min, the flux used included ammonium chloride 100g / L, zinc chloride 80g / L, emulsifier TX-10 0.5g / L, disodium hydrog...

Embodiment 2

[0089] The steel used in this embodiment is 40mm×40mm×1mm SPHC steel plate, and a hole with a diameter of 4mm is drilled at one end of the steel plate, and iron wire is inserted to make a test piece. The specific chemical composition is consistent with the steel described in Example 1.

[0090] This embodiment provides a method for hot-dipping composite coatings on steel, said method comprising the following steps:

[0091] (1) Firstly, the steel is pretreated, the steel is placed in an alkaline washing solution, and cleaned at 85°C for 10 minutes. The alkaline washing solution includes 150 g / L of sodium hydroxide and 50 g / L of potassium carbonate, and then washed with water , and then placed in the pickling solution, cleaned at 45°C for 5 minutes, the pickling solution included hexamethylenetetramine 10g / L and hydrochloric acid 3mol / L, and then washed with water; the pretreated steel was washed at 85 ℃ for 1 min, the flux used includes ammonium chloride 120g / L, zinc chloride ...

Embodiment 3

[0095] The steel used in this embodiment is the SPHC steel plate of 40mm × 40mm × 0.4mm, and a hole with a diameter of 4mm is drilled at one end of the steel plate, and iron wire is inserted to make a test piece. The specific chemical composition is consistent with the steel described in Example 1. .

[0096] This embodiment provides a method for hot-dipping composite coatings on steel, said method comprising the following steps:

[0097] (1) First, the steel is pretreated, the steel is placed in an alkaline washing solution, and cleaned at 83°C for 8 minutes. The alkaline washing solution includes potassium hydroxide 120g / L and sodium carbonate 75g / L, and then washed with water , and then placed in the pickling solution, cleaned at 40°C for 4 minutes, the pickling solution included hexamethylenetetramine 6g / L and hydrochloric acid 2mol / L, and then washed with water; the pretreated steel was washed at 82 ℃ for 1.5min, the flux used included ammonium chloride 110g / L, zinc chlo...

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Abstract

The invention provides a method for hot dipping of a steel material with a composite coating. The method comprises the following steps: carrying out plating assisting treatment on the pretreated steel material; carrying out hot-dip galvanizing on the steel subjected to assistant plating; and the steel obtained after hot-dip galvanizing is taken out, the interval is 3-8 s, then zinc-aluminum-based alloy is galvanized in a hot-dip mode, and the steel obtained after hot-dip plating of the composite coating is obtained after cooling. According to the method, the steel is subjected to hot dipping, a composite coating is formed on the surface of the steel, the corrosion resistance of the steel is improved, the problems of skip plating, nodulation, blistering and the like are effectively solved, and the method is easy to operate, low in cost, good in economic benefit, beneficial to industrial large-scale production and good in industrial application prospect.

Description

technical field [0001] The invention belongs to the technical field of metal surface anticorrosion, and relates to a method for hot-dip composite coating of steel materials. Background technique [0002] Metal products are placed in the atmosphere for a long time during use, and due to the presence of oxygen, water and other components, it is easy to cause corrosion. As a widely used alloy material, improving its anti-corrosion ability is an important means to ensure its service life. Among them, hot-dip plating is a commonly used anti-corrosion technology. Hot-dip galvanizing, referred to as hot-dip galvanizing, is a process that immerses the piece to be plated in a molten metal liquid to form a metal coating on the surface, which can significantly improve the corrosion resistance of steel in the air. [0003] Hot dip coating is divided into solvent method hot dip coating and protective gas reduction method hot dip coating. Among them, solvent hot-dip plating is often use...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C2/06C23C2/02C23G1/19C23G1/08C23G1/06C22C18/04C23C22/17C23C2/40C23C2/34C22C38/02C22C38/04C22C38/06C22C38/18
CPCC23C2/06C23C2/02C23G1/19C23G1/08C22C18/04C23C22/17C23C2/40C23G1/061C22C38/02C22C38/04C22C38/06C22C38/002C22C38/18C23C2/34C23G1/065
Inventor 崔彦斌汪前雨刘姣岳君容武荣成张建岭
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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