Diffusion zincizing coating method

A technology of diffusion infiltration and zinc coating, applied in solid diffusion coating, coating, metal material coating process, etc., can solve the problem that iron and steel parts are prone to re-oxidation, incomplete diffusion zinc coating, and corrosion of parts/components. and other problems, to achieve the effect of stable zinc source and heat conduction conditions, loose operation process requirements and time in the furnace, and elimination of leakage and plating.

Inactive Publication Date: 2014-03-26
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the above process, especially in the process of drying and charging, steel parts are prone to re-oxidation
Due to degreasing, pickling unclean or re-oxidation during drying and loading, it is easy to cause partial leaking and plating of steel parts after thermal diffusion treatment, making the surface of steel parts incomplete or spotted. leak plating
In the service environment, these leakage plating defects in the diffusion zinc layer and the corrosive medium in the environment form a corrosion battery, which will cause local corrosion and pitting of parts / components, which will seriously affect the service life.
In the prior art, the leakage plating rate of the products is higher than 10%, which greatly affects the application and development of this technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: the method for the diffusion galvanized coating of the present embodiment is:

[0017] A. Use conventional mechanical galvanizing methods to pre-coat a 40-micron zinc deposition layer on the surface of steel parts (the workpiece is a Ф16 flat gasket, 50 kg, and the area to be plated is 7.5 square meters), so as to obtain a prefabricated part without missing plating;

[0018] B. Bury the above-mentioned prefabricated parts in the anti-oxidation filler and put them into a diffusion and infiltration furnace or an incubator, or coat the surface of the prefabricated parts with an anti-oxidation coating and dry them naturally, then put them in a diffusion and infiltration furnace or an incubator. Heat preservation, heat the temperature in the box to 400°C and then keep it warm for 10 hours, so that the zinc and iron atoms diffuse each other and finally form a diffusion zinc layer with a zinc-iron alloy structure on the surface of the workpiece. The composition o...

Embodiment 2

[0019] Embodiment 2: the method for the diffusion galvanized coating of the present embodiment is:

[0020] A. Use conventional mechanical galvanizing methods to pre-coat a layer of 50 micron zinc deposition layer on the surface of steel parts (the workpiece is a high-strength fastening bolt of 100 kg, and the area to be plated is 6 square meters), so as to obtain a prefabricated part without missing plating ;

[0021] B. Bury the above-mentioned prefabricated parts in the anti-oxidation filler and put them into a diffusion and infiltration furnace or an incubator, or coat the surface of the prefabricated parts with an anti-oxidation coating and heat it to 80 ° C for 30 minutes before placing it in a diffusion and infiltration plating Insulate in a furnace or an incubator, heat the temperature in the box to 540°C and then insulate for 12 hours, so that the zinc and iron atoms diffuse each other and finally form a diffuse zinc-iron alloy structure on the surface of the workpie...

Embodiment 3

[0022] Embodiment 3: the method for the diffusion galvanized coating of the present embodiment is:

[0023] A. Use the conventional mechanical galvanizing method to pre-coat a 30-micron zinc deposition layer on the surface of steel parts (the workpiece is an ordinary metric M10 nut 200 ㎏, and the area to be plated is 16 ㎡), so as to obtain a prefabricated part without missing plating;

[0024] B. Bury the above-mentioned prefabricated parts in the anti-oxidation filler and put them into the diffusion coating furnace or incubator, or coat the surface of the prefabricated parts with an anti-oxidation coating and heat them to 100°C for 10 minutes, then put them into the diffusion coating Insulation is carried out in a furnace or an incubator, and the temperature in the box is heated to 600°C and then held for 20 hours, so that the zinc and iron atoms diffuse each other and finally form a diffuse zinc-iron alloy structure on the surface of the workpiece. The composition of anti-ox...

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Abstract

The invention relates to a diffusion zincizing coating method and belongs to the technical field of surface coating techniques of steel materials. The method comprises the steps of precoating the surface of a steel product with a zinc deposition layer according to a traditional mechanical zinc coating method, burying the steel product in anti-oxidation filling and putting in a diffusion coating furnace or an incubator, or applying an anti-oxidation coating on a workpiece with a pre-coated zinc layer, drying and putting in the diffusion coating furnace or the incubator for heat preservation, and allowing zinc iron atoms to diffuse mutually to form a diffusion zincizing layer with a zinc-iron alloy structure. With the adoption of the method, diffusion zincizing uncoating caused by pretreatment and reoxidation can be avoided basically, the quality of the diffusion zincizing layer is ensured, and the yield of a product is greatly improved.

Description

technical field [0001] The invention relates to a method for diffusing galvanized coating, which belongs to the technical field of surface coating technology of iron and steel materials. Background technique [0002] About one-tenth of the world's steel output is lost to corrosion and rust, and the economic losses caused to my country are at least 40 billion yuan per year, especially in environmental conditions such as outdoor exposure, marine atmosphere, and industrial atmosphere, such as road facilities, water conservancy, Components and parts of chemical industry, marine, metallurgy, power generation, automobile and construction machinery, etc. Therefore, corrosion protection of steel components and products is one of the important measures for the stable operation of engineering construction and equipment manufacturing. Forming a diffusion zinc layer on the surface of steel parts and products is an effective protective measure for the steel surface, because the diffusion ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C10/02C23C10/30
Inventor 赵晓军王胜民何明奕谭杰张启云
Owner KUNMING UNIV OF SCI & TECH
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