Steel structure part surface protective coating and preparation method thereof

A technology for protective coatings and structural parts, applied in the field of protective coatings on the surface of steel structural parts and its preparation, can solve the problems of short anti-corrosion life, high porosity, limited coating thickness, etc., to improve corrosion resistance and prolong service life , the effect of simple method

Active Publication Date: 2016-06-01
GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hot-dip galvanizing is to immerse the workpiece to be coated in the molten zinc solution, so that the surface of the workpiece is bonded with a layer of zinc coating. It is currently the main means of anti-corrosion tower rods. However, the preparation process of this method requires high temperature, and the coating cannot be repaired after damage. Moreover, the thickness of the coating is limited, and its anti-corrosion life is short; thermal spraying uses oxygen-acetylene as a heat source for heating metal materials (flame spraying) or an electric arc as a heat source (arc spraying), and atomizes the molten metal with a high-speed airflow and High-speed spraying to the surface of the workpiece to form a coating....

Method used

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  • Steel structure part surface protective coating and preparation method thereof
  • Steel structure part surface protective coating and preparation method thereof
  • Steel structure part surface protective coating and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0038] The surface of the light steel alloy of the high-voltage transmission tower is mechanically sandblasted to make it look metallic, and then within 8 hours, the Zn / Al / Mg alloy powder is directly sprayed on the light steel alloy of the high-voltage transmission tower by using a high-speed airflow On the surface of structural parts, the compressed gas is air, by controlling the spraying parameters: spraying distance 25mm, gas pressure 3.5MPa, gas temperature 600°C, air flow rate 35g / s, spraying time 20min / m 2 , Zn / Al / Mg alloy powder is deposited on the surface of the light steel alloy to obtain a uniformly distributed protective coating, the thickness of the coating is 120 microns, and its structure is as follows figure 2 As shown, the coating is firmly combined with the steel structure and can be used as a long-term protective coating for the steel structure.

Embodiment 2

[0040]The surface of the light steel alloy of the high-voltage transmission tower is mechanically sandblasted to make it have a metallic color, and then within 8 hours, the Zn / Al / Mg alloy powder is directly sprayed on the light steel alloy of the high-voltage transmission tower by using a high-speed airflow On the surface of structural parts, the compressed gas is air, by controlling the spraying parameters: spraying distance 40mm, gas pressure 4.0MPa, gas temperature 700°C, air flow rate 40g / s, spraying time 30min / m 2 , Zn / Al / Mg alloy powder is deposited on the surface of the light steel alloy to obtain a uniformly distributed protective coating, the thickness of the coating is 180 microns, and it is firmly combined with the steel structure, which can be used as the steel structure Long-lasting protective coating.

Embodiment 3

[0042] The surface of the light steel alloy of the high-voltage transmission tower is mechanically sandblasted to make it have a metallic color, and then within 8 hours, the Zn / Al / Mg alloy powder is directly sprayed on the light steel alloy of the high-voltage transmission tower by using a high-speed airflow On the surface of structural parts, the compressed gas is air, by controlling the spraying parameters: spraying distance 45mm, gas pressure 4.5MPa, gas temperature 800°C, air flow rate 45g / s, spraying time 45min / m 2 , Zn / Al / Mg alloy powder is deposited on the surface of the light steel alloy to obtain a uniformly distributed protective coating. The thickness of the coating is 260 microns, and its structure is as follows image 3 As shown, it is firmly combined with the steel structure and can be used as a long-term protective coating for the steel structure.

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Abstract

The invention relates to a steel structure part surface protective coating and a preparation method thereof. The preparation method comprises the following steps that Zn/Al/Mg alloy powder is directly sprayed on the surface of a steel structure part through high-speed airflow, so that the Zn/Al/Mg alloy powder is deposited on the surface to form the protective coating. The Zn/Al/Mg alloy powder is formed by mixing 5 wt%-15 wt% of aluminum powder, 0.01 wt%-0.02 wt% of magnesium powder and the balance zinc powder. The spraying technological parameters are as follows, the spraying distance is 25-50 mm, the air pressure is 3.5-5.0 MPa, the air temperature is 580-800 DEG C, and the air flow is 35-50 g/s. According to the preparation method, the uniformly distributed Zn/Al/Mg coating with the ideal thickness can be prepared on the surface of the steel structure part, the corrosion resistance of the steel structure part in the marine environment is remarkably improved, and the service life is prolonged.

Description

technical field [0001] The invention relates to the field of metal anticorrosion, in particular to a protective coating on the surface of steel structural parts and a preparation method thereof. Background technique [0002] The environment around the ocean contains highly corrosive electrolytes. Over the years, countries have made unremitting efforts to prevent the corrosion of steel materials in the marine environment. As early as the 1930s, the long-term anti-corrosion technology of spraying a certain thickness of zinc, aluminum or their alloys on the steel surface to form a dense coating has been used. In various typical environments, the protection life exceeds 20 years without maintenance. The 19-year test of the American Welding Society on the thermal sprayed zinc (aluminum) layer shows that the coating thickness is 80-150 μm, which can ensure that the base metal will not be corroded in the harsh marine atmosphere; the tests of the former Soviet Union also show that,...

Claims

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Application Information

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IPC IPC(8): C23C24/02
CPCC23C24/02
Inventor 刘静黄青丹张亚茹饶锐宋浩永赵崇智何彬彬李聃陈于晴吴培伟裴利强李助亚
Owner GUANGZHOU POWER SUPPLY BUREAU GUANGDONG POWER GRID CO LTD
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