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Non-poaching-water common hot-dip galvanizing technique

A technology of hot-dip galvanizing without rinsing, applied in hot-dip galvanizing process, metal material coating process, coating, etc., which can solve the problems of water consumption and treatment cost increase, so as to save water resources and increase galvanizing Great effect on cost, social and economic benefits

Inactive Publication Date: 2008-07-09
ZHEJIANG SHENGDA STEEL TOWER +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a common hot-dip galvanizing process without rinsing water, which mainly solves the problem in the prior art that the industrial wastewater produced in the hot-dip galvanizing process is discharged up to the standard after treatment, and galvanizing needs to consume A large amount of water resources are lost, and the treatment cost is greatly increased, etc.

Method used

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  • Non-poaching-water common hot-dip galvanizing technique

Examples

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Effect test

Embodiment 1

[0032] Embodiment 1: the ordinary hot-dip galvanizing process without rinsing water of this example is as shown in Figure 1, and the steps are as follows:

[0033] a. Degreasing: immerse the workpiece to be galvanized in the degreasing solution to remove all kinds of grease pollution on the surface of the workpiece to be galvanized. The degreasing solution is an aqueous solution of non-phosphorus degreasing agent, which contains 2% of non-phosphorus degreasing agent, the temperature is controlled at 40°C, the degreasing and immersion time is determined according to the degree of oil pollution, and it is 10 minutes. The qualified standard for degreasing treatment is that there is no oil on the surface of the plating Impurity attachment;

[0034] b. Pickling: immerse the workpiece to be galvanized without oil pollution in the pickling solution to remove the iron oxide on the surface of the plated piece, that is, Fe 2 o 3 , Fe 3 o 4 , FeO, to ensure the smooth progress of the...

Embodiment 2

[0040] Embodiment 2: the ordinary hot-dip galvanizing process without rinsing water of this example is as shown in Figure 1, and the steps are as follows:

[0041] a. Degreasing: immerse the workpiece to be galvanized in the degreasing solution to remove all kinds of grease pollution on the surface of the workpiece to be galvanized. The degreasing liquid is an aqueous solution of non-phosphorus degreasing agent, which contains 1% of non-phosphorus degreasing agent. The temperature is controlled at 45°C. The degreasing and immersion time is determined according to the degree of oil pollution, which is 15 minutes. The qualified standard for degreasing treatment is that there is no oil on the surface of the plating Impurity attachment;

[0042] b. Pickling: immerse the workpiece to be galvanized without oil pollution in the pickling solution to remove the iron oxide on the surface of the plated piece, that is, Fe 2 o 3 , Fe 3 o 4 , FeO, to ensure the smooth progress of the zi...

Embodiment 3

[0048] Embodiment 3: the ordinary hot-dip galvanizing process without rinsing water of this example is as shown in Figure 1, and the steps are as follows:

[0049] a. Degreasing: immerse the workpiece to be galvanized in the degreasing solution to remove all kinds of grease pollution on the surface of the workpiece to be galvanized. The degreasing solution is an aqueous solution of non-phosphorus degreasing agent, which contains 3% of non-phosphorus degreasing agent, the temperature is controlled at 50°C, the degreasing and immersion time is determined according to the degree of oil pollution, and it is 11 minutes. The qualified standard for degreasing treatment is that there is no oil on the surface of the plating Impurity attachment;

[0050] b. Pickling: immerse the workpiece to be galvanized without oil pollution in the pickling solution to remove the iron oxide on the surface of the plated piece, that is, Fe 2 o 3 , Fe 3 o 4 , FeO, to ensure the smooth progress of the...

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Abstract

The invention relates to a hot-dip galvanizing process, in particular to a common hot-dip galvanizing process without rinse water, which aims to solve the technical problems existing in prior art that after being treated, if industrial wastewater which is produced during hot-dip galvanizing is discharged reaching the standard, galvanizing needs to consume a large number of water source, and the treatment cost is greatly increased and the like. The steps of common hot-dip galvanizing process without rinse water of the invention comprises degreasing, cleaning and plating auxiliary, wherein to-be-galvanized workpieces are dipped in assisted plating solution, whose components are aqueous solution of ZnCl2 and NH4Cl, the PH valve of the assisted plating solution is adjusted through adding ammonia water, then Fe2+ on the surface of the workpiece is changed into Fe3+ through hydrogen peroxide solution, and then the Fe3+ is filtered out through a filter purification device, a layer of assisted plating film is formed on the surface of the workpiece, drying, hot-dip galvanizing, cooling and inactivating.

Description

technical field [0001] The invention relates to a hot-dip galvanizing process, in particular to an ordinary hot-dip galvanizing process without rinsing water. Background technique [0002] In recent years, the country has paid more and more attention to the protection of water pollution and the environment. In order to solve the problem of discharging the industrial wastewater (rinsing water) produced during the hot-dip galvanizing process to meet the standard after treatment, galvanizing enterprises have to consume a large amount of water resources, and the treatment cost substantial improvement. Chinese patent discloses a hot-dip galvanizing process (publication number: CN 1847443A), which includes the following steps: alkali washing, water washing, pickling, water washing, dipping zinc ammonium chloride solvent, drying, hot-dip galvanizing , cooling, the solvent in the impregnated zinc ammonium chloride solvent step is added with 3.0~6.0% by weight of nanometer zinc oxid...

Claims

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Application Information

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IPC IPC(8): C23C2/06C23C2/02
Inventor 朱文德
Owner ZHEJIANG SHENGDA STEEL TOWER
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