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Environment-friendly hot-drip coating method

A hot-dip and environmental-friendly technology, applied in the hot-dip plating process, coating, metal material coating process, etc., can solve the problems of long time consumption, high cost, high energy consumption, etc., to reduce risks, avoid missing plating, adaptable effect

Active Publication Date: 2018-07-10
TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. Environmental pollution: on the one hand, due to the commonly used pickling and rust removal methods, the discharge of waste acid and pickling water (more than 30 kg of waste acid and 4 tons of waste pickling water are produced for each ton of steel wire produced) and pickling The acid gas produced during the period will pollute the environment
In addition, when the solvent on the surface of the workpiece reacts with the zinc liquid, a large amount of zinc fumes will be produced, causing environmental pollution.
[0005] 2. Low production efficiency: it takes time to dry the workpiece and heat up to the hot-dip process temperature, so the production efficiency cannot be improved
[0006] 3. High production cost: High production cost due to high energy consumption and high zinc consumption, low product profit and poor competitiveness
[0007] 4. It is only suitable for hot-dip galvanizing, and it is necessary to develop different new-type fluxes for hot-dip other alloys
thus resulting in high zinc capacity and high energy consumption
In addition, the pretreatment also adopts the degreasing-pickling process, which has serious pollution
The pre-galvanized workpiece is also immersed in the zinc pot in a cold state, and is heated to the galvanizing process temperature by the zinc liquid, which takes a long time, so the production efficiency is low
[0014] In summary, the current hot-dip galvanizing of long products has problems such as high pollution, low efficiency, high cost, and different processes for different products.

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0039] Adopt the inventive method to implement the threaded steel of product diameter 10mm, material 20MnSi, tensile strength 455Mpa, hot-dip Galfan alloy. The coating thickness is required to be 15um, and the strength drop shall not exceed 5%. Its technological process is:

[0040] Grind the threaded steel with a wire wheel to remove rust, Figure 4 The Galfan alloy was plated on the test device, and the induction heating was carried out in the quartz tube under the protection of nitrogen gas. After the rust removal treatment, it was immediately inserted into the quartz tube filled with nitrogen gas, and the heating temperature of the workpiece was measured by an infrared thermometer when it was 485 ° C. The quartz tube is directly inserted into the Galfan bath, the hot-dip time is 6 seconds, and the hot-dip temperature is 450°C. Air cooling and water cooling are proposed, thereby completing the hot-dip process without help.

[0041] In this embodiment, the diameter of the ...

Embodiment 2

[0044] Adopt the method of the present invention to implement the angle steel hot-dip galvanizing of product 30*30*3, material Q345, strength 450Mpa requires the amount of zinc 140g / m 2 , which is 20um thick, the strength drops within 5%. Its technological process is:

[0045] After the angle steel is shot blasted, the Figure 4 Galvanizing is implemented on the experimental device. In this embodiment, the inner diameter of the quartz tube matches the shape of the angle steel, and the angle steel can move up and down in the quartz tube. When induction heating is carried out in the quartz tube, an infrared thermometer is used to measure the temperature. When the surface of the angle steel is heated to 520 ° C, the hot-dip temperature is 450 ° C, inserted into the zinc solution for plating, and the hot-dip time is 8 seconds.

[0046] The three parallel hot-plated workpieces obtained by the process of this embodiment have coating thicknesses of 18 μm, 21 μm, and 23 μm, respecti...

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Abstract

The invention relates to an environment-friendly hot-drip coating method. According to the method, an environment-friendly rust removing method is adopted to conduct rust removing treatment on the surface of steel, and a preparing surface before coating is obtained; then fast heating is conducted in a protective atmosphere, then a to-be-processed workpiece directly enters a plating solution in a closed system for executing hot-dip coating, the fast heating temperature is higher than the hot-dip coating temperature, and a coating layer is formed on the metal surface; and finally, aftertreatmentis performed to obtain a finished product, and the hot-dip coating technology is completed. According to the environment-friendly hot-drip coating method, the advantages of a solvent method and the advantages of a reduction method are combined, the defects of the solvent method and the defects of the reduction method are abandoned, a mechanical derusting method or a modern environment-friendly rust remover is used for replacing seriously-polluted acid pickling, no plating-assistant agent is used, the workpiece subjected to environment-friendly rust removing is quickly heated and plated underthe inert gas shielding action, and accordingly environment-friendly hot-dip coating without acid pickling and plating assisting can be well achieved. The method not only can be used for hot-dip galvanizing but also can be used for hot-dip coating of other kinds of zinc-aluminum alloy, and the application range is wide.

Description

technical field [0001] The invention relates to the technical field of hot-plating in the metallurgical industry, in particular to an environment-friendly hot-plating method. Background technique [0002] Traditional hot-plating methods mainly include solvent method (also known as dry method) and gas reduction method. [0003] The solvent method is to use pickling to remove rust on the surface of the workpiece, and then dip it in a zinc-ammonia solution-type flux for hot-dip plating, see figure 1 . The specific process is as follows: degreasing 1, washing 2, derusting 3, washing 2, plating help 4, drying 5, hot-dip 6, post-treatment 7, finished product 8. Among them, pickling is mostly used for rust removal, which is the most economical and effective rust removal method at present. The biggest problem is environmental pollution. The principle of the solvent method is to clean the surface of the steel part, dip it in a solvent to protect the surface from rusting again, and...

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 曹晓明谢志峰
Owner TIANJIN GONGDA GALVANIZING EQUIP CO LTD
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