CN113150642A - Anticorrosive coating system for outer wall of tower cylinder of ocean wind turbine generator and coating method - Google Patents

Abstract

The invention provides an anticorrosive coating system for the outer wall of a tower drum of an ocean wind turbine generator and a coating method, wherein the anticorrosive coating system comprises the following components: a primer coating, an epoxy micaceous iron intermediate paint coating and a finish paint coating; the primer coating is a graphene zinc-rich coating and is coated on the surface of the steel structure. The engineering application of the graphene zinc-rich primer on the ocean wind power is realized, the protective life of the coating is prolonged through the design of the coating system, an anticorrosion technology integrating an anticorrosion coating system and a coating process is formed, the service life of the wind power equipment is prolonged, and the maintenance cost is reduced. Specifically, the graphene zinc-rich paint is adopted to replace the traditional epoxy zinc-rich primer, and a small amount of graphene is added into the paint, so that the content of zinc powder in the coating can be reduced, the adhesive force of the coating to a base material is improved, and the cathode protection effect of the coating is better.

Description

Anticorrosive coating system for outer wall of tower cylinder of ocean wind turbine generator and coating method

Technical Field

The invention belongs to the technical field of corrosion protection, and particularly relates to an anticorrosive coating system for the outer wall of a tower drum of an ocean wind turbine generator and a coating method.

Background

The ocean wind turbine generator system faces strong corrosion environment with high humidity, high salt fog and alternation of dry and wet for a long time, and the tower barrel is extremely easy to corrode in the ocean atmospheric region, thereby bringing huge potential safety hazards to wind power equipment, shortening the service life of the wind power equipment, increasing the maintenance cost and causing economic loss. The severe environment causes severe corrosion threat to the marine wind power equipment, and the outer wall of the steel structure tower barrel in the atmospheric region is usually protected by adopting a three-layer composite anti-corrosion coating system consisting of epoxy zinc-rich primer, epoxy mica iron intermediate paint and polyurethane finish paint.

The cathode protection action principle of the traditional zinc-rich primer on the steel substrate is that a zinc-rich coating forms a zinc powder protective film on the steel surface, and under the action of a corrosion medium, zinc powder and a metal matrix form a zinc-iron corrosion battery. The zinc powder has a potential lower than that of iron, and can be used as an active metal sacrificial anode to provide cathodic protection for matrix metal and prevent the corrosion of steel.

However, in order to achieve a good protection effect, an electric path needs to be formed among the zinc powder, and increasing the content of the zinc powder is beneficial to improving the conductive path of the coating, so that the salt spray resistance of the coating is improved, but the excessive content of the zinc can cause a series of problems of reduced adhesion of the coating, reduced impact strength and the like. The use practice shows that the anticorrosive coating system adopted at the present stage cannot effectively resist the severe corrosion environment encountered by the ocean wind power equipment, so that the wind power equipment is frequently and obviously corroded or is hidden corroded.

Disclosure of Invention

The invention provides an anticorrosive coating system for the outer wall of a tower barrel of an ocean wind turbine generator and a coating method, which solve the problem that the existing anticorrosive coating system is easy to cause the wind power equipment to be frequently and obviously corroded or corroded in a concealed mode.

The invention provides an anticorrosive coating system for the outer wall of a tower cylinder of an ocean wind turbine, which comprises the following components: a primer coating, an epoxy micaceous iron intermediate paint coating and a finish paint coating;

the primer coating is a graphene zinc-rich coating and is coated on the surface of the steel structure.

Optionally, the thickness of the dry film of the graphene zinc-rich coating is 40-70 μm.

Optionally, the dry film thickness of the epoxy micaceous iron oxide intermediate paint coating is 320-340 μm.

Optionally, the epoxy mica iron intermediate paint coating is an epoxy mica iron intermediate paint containing scaly mica pigment.

Optionally, the finish coat is a polyurethane finish coat or a fluorocarbon finish coat.

Optionally, the dry film thickness of the finish coat is 80-110 μm.

Optionally, the total dry film thickness of the system is 440 to 520 μm.

The invention also provides a coating method of the anticorrosive coating system for the outer wall of the tower barrel of the marine wind turbine generator, which comprises the following steps:

carrying out oil and rust removal treatment on the surface of the steel plate, carrying out sand blasting on the surface to Sa2.5 level, and blowing clean by using dry compressed air;

spraying the graphene zinc-rich coating as a primer by adopting an air spraying method;

after the graphene zinc-rich coating is dried for 6 hours, coating an epoxy micaceous iron intermediate paint coating;

coating the epoxy micaceous iron intermediate paint, airing for 24 hours, and spraying a finish coat; and air-drying at room temperature for 7 days.

Optionally, the epoxy micaceous iron oxide intermediate paint coating comprises:

and spraying or brushing the epoxy micaceous iron intermediate paint coating.

Optionally, the brushing the epoxy micaceous iron intermediate paint coating comprises:

and brushing four epoxy micaceous iron intermediate paint coatings at intervals of 0.5 h.

The invention provides an anticorrosive coating system and a coating method for the outer wall of a tower cylinder of an ocean wind turbine generator system, which realize the engineering application of graphene zinc-rich primer on ocean wind power, prolong the protection period of the coating through the design of the coating system, form an anticorrosive technology integrating an anticorrosive coating system and a coating process, prolong the service life of wind power equipment and reduce the maintenance cost. Specifically, the graphene zinc-rich paint is adopted to replace the traditional epoxy zinc-rich primer, and a small amount of graphene is added into the paint, so that the content of zinc powder in the coating can be reduced, the adhesive force of the coating to a base material is improved, and the cathode protection effect of the coating is better. The traditional epoxy zinc-rich primer improves the electric path of the coating by increasing the content of zinc powder, and the coating with too high content of zinc powder becomes brittle, so that the toughness is reduced and the adhesion to a base material is reduced. After a small amount of graphene is added, the graphene is good in conductivity and can be communicated with zinc powder in the coating, and the electrochemical protection performance of the coating is guaranteed. Meanwhile, the flaky graphene layers are stacked, so that a shielding effect can be achieved, and a good barrier effect on corrosive media is achieved. The epoxy mica iron intermediate paint is used as an intermediate coating, the scaly mica iron oxide is used as a filler, and the flaky structures are overlapped in a staggered mode and stacked layer by layer to play a shielding role, so that the invasion path of a corrosive medium is greatly prolonged, and the diffusion of water, Cl & lt- & gt and the like in the coating is reduced. The finish paint is polyurethane finish paint or fluorocarbon finish paint, and the polyurethane finish paint has good wear resistance, water resistance, acid and alkali medium resistance and can adapt to marine corrosion environment. The fluorocarbon coating is a general name of series coatings taking fluorine-containing resin as a main film forming material, the fluorocarbon finish contains a large amount of C-F chemical bonds, the bond energy is up to 485.6kJ/mol, the molecular structure and the chemical property of the fluorocarbon coating are stable, and the aging resistance of the fluorocarbon coating is strong.

Drawings

FIG. 1 is a schematic structural diagram of an anticorrosive coating system for the outer wall of a tower of an ocean wind turbine provided by the invention.

Detailed Description

The anticorrosive coating system and the coating method for the outer wall of the tower cylinder of the marine wind turbine generator set provided by the invention are explained in detail below with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of an anticorrosion coating system for an outer wall of a tower of an ocean wind turbine generator system, as shown in fig. 1, the anticorrosion coating system provided by the invention comprises: a primer coating, an epoxy micaceous iron intermediate paint coating and a finish paint coating;

the primer coating is a graphene zinc-rich coating and is coated on the surface of the steel structure.

Aiming at the corrosion problem of the outer wall of the tower barrel of the ocean wind turbine generator, the design of an anti-corrosion coating system is developed, the engineering application of the graphene zinc-rich primer on the ocean wind power is realized, the protection life of the coating is prolonged through the design of the coating system, an anti-corrosion technology integrating an anti-corrosion coating system and a coating process is formed, the service life of wind power equipment is prolonged, and the maintenance cost is reduced.

The invention designs a coating system, provides a long-acting heavy-duty anticorrosive coating system, and adopts the coating matching of 'graphene zinc-rich anticorrosive primer + epoxy micaceous iron intermediate paint + polyurethane finish paint' or 'graphene zinc-rich anticorrosive primer + epoxy micaceous iron intermediate paint + fluorocarbon finish paint', so that the anticorrosive capacity of wind power equipment is improved, and the service life of the wind power equipment is prolonged.

According to the anti-corrosion coating system for the outer wall of the tower barrel of the ocean wind turbine generator, the graphene zinc-rich coating is coated on the surface of a steel structure, the epoxy micaceous iron intermediate paint coating is coated, and the polyurethane finish paint or fluorocarbon finish paint coating is coated finally to form a three-layer anti-corrosion coating system. The graphene zinc-rich primer has high corrosion resistance and good cathodic protection effect on a steel substrate, and the thickness of a dry film of the coating is 40-70 mu m. The intermediate paint is epoxy micaceous iron intermediate paint, the dry film thickness of the intermediate paint coating is 320-340 mu m, and the preferred intermediate paint is epoxy micaceous iron intermediate paint containing scaly mica pigment. The finish paint is polyurethane finish paint or fluorocarbon finish paint, the thickness of a dry film of the coating is 80-110 mu m, and the total thickness of a dry film of an anticorrosion coating system is 440-520 mu m.

The coating system has the following specific characteristics:

(1) the graphene zinc-rich paint is adopted to replace the traditional epoxy zinc-rich primer, and a small amount of graphene is added into the paint, so that the content of zinc powder in the coating can be reduced, the adhesive force of the coating to a base material is improved, and the cathode protection effect of the coating is better. The traditional epoxy zinc-rich primer improves the electric path of the coating by increasing the content of zinc powder, and the coating with too high content of zinc powder becomes brittle, so that the toughness is reduced and the adhesion to a base material is reduced. After a small amount of graphene is added, the graphene is good in conductivity and can be communicated with zinc powder in the coating, and the electrochemical protection performance of the coating is guaranteed. Meanwhile, the flaky graphene layers are stacked, so that a shielding effect can be achieved, and a good barrier effect on corrosive media is achieved.

(2) The epoxy mica iron intermediate paint is used as an intermediate coating, the scaly mica iron oxide is used as a filler, and the flaky structures are overlapped in a staggered way and stacked layer by layer to play a shielding role, so that the invasion path of a corrosive medium is greatly prolonged, and water and Cl are reduced^-Etc. in the coating.

(3) The finish paint is polyurethane finish paint or fluorocarbon finish paint, and the polyurethane finish paint has good wear resistance, water resistance, acid and alkali medium resistance and can adapt to marine corrosion environment. The fluorocarbon coating is a general name of series coatings taking fluorine-containing resin as a main film forming material, the fluorocarbon finish contains a large amount of C-F chemical bonds, the bond energy is up to 485.6kJ/mol, the molecular structure and the chemical property of the fluorocarbon coating are stable, and the aging resistance of the fluorocarbon coating is strong.

Through the design of the anti-corrosion coating system on the outer wall of the tower barrel of the ocean wind turbine generator, a long-acting anti-corrosion coating system can be formed, the corrosion rate and the expansion rate of the wind power equipment in the service process are reduced, the overhaul time and the service life of the equipment are prolonged, and the economical efficiency is improved. Through coating performance tests, the anticorrosive coating system of the invention achieves the following technical indexes, as shown in table 1.

TABLE 1 Corrosion protection coating System Properties

By way of example, the corrosion resistant coating system and coating method provided by the present invention will be illustrated below with reference to specific coating thickness examples.

Example 1

Before coating, the surface of a steel plate with the thickness of 3mm is subjected to oil and rust removal treatment, the surface is subjected to sand blasting to Sa2.5 level, visible rust, dirt, oxide skin and foreign matters do not exist on the surface after the sand blasting is finished, and surface dust is blown clean by dry compressed air. And (3) spraying the graphene zinc-rich primer by adopting an air spraying method, wherein the thickness of a dry film is 40 mu m, and coating the epoxy micaceous iron intermediate paint after the primer is dried for 6 h. The intermediate paint coating process can adopt spraying and brushing, if brushing is adopted, the intermediate paint is brushed for four times at an interval of 0.5h, and the dry film thickness is 320 mu m. After the intermediate paint is coated, the paint is dried for 24 hours, and the polyurethane finish paint can be sprayed, wherein the dry film thickness of the finish paint is 80 mu m. After finishing paint coating, the coating is dried at room temperature for 7 days to obtain an anticorrosive coating system. The performance of the paint is tested, the paint resists cathodic disbonding and soaking for 180 days, the salt spray resistance time is 5000h, and the adhesive force is 15.3 MPa.

Example 2

Before coating, the surface of a steel plate with the thickness of 3mm is subjected to oil and rust removal treatment, the surface is subjected to sand blasting to Sa2.5 level, visible rust, dirt, oxide skin and foreign matters do not exist on the surface after the sand blasting is finished, and surface dust is blown clean by dry compressed air. And (3) spraying the graphene zinc-rich primer by adopting an air spraying method, wherein the thickness of a dry film is 50 mu m, and coating the epoxy micaceous iron intermediate paint after the primer is dried for 6 h. The intermediate paint coating process can adopt spraying and brushing, if the intermediate paint coating process adopts brushing, the intermediate paint is brushed for four times at an interval of 0.5h, and the dry film thickness is 340 mu m. After the intermediate paint is coated, the paint is dried for 24 hours, and the polyurethane finish paint can be sprayed, wherein the dry film thickness of the finish paint is 90 mu m. After finishing paint coating, the coating is dried at room temperature for 7 days to obtain an anticorrosive coating system. Testing the performance of the paint, and resisting cathodic disbanding and soaking for 180d, the salt spray resisting time is 5300h, and the adhesive force is 15.1 MPa.

Example 3

Before coating, the surface of a steel plate with the thickness of 3mm is subjected to oil and rust removal treatment, the surface is subjected to sand blasting to Sa2.5 level, visible rust, dirt, oxide skin and foreign matters do not exist on the surface after the sand blasting is finished, and surface dust is blown clean by dry compressed air. And (3) spraying the graphene zinc-rich primer by adopting an air spraying method, wherein the thickness of a dry film is 60 mu m, and coating the epoxy micaceous iron intermediate paint after the primer is dried for 6 h. The intermediate paint coating process can adopt spraying and brushing, if the intermediate paint coating process adopts brushing, the intermediate paint is brushed for four times at an interval of 0.5h, and the dry film thickness is 340 mu m. After the intermediate paint is coated, the paint is dried for 24 hours, and the polyurethane finish paint can be sprayed, wherein the dry film thickness of the finish paint is 100 mu m. After finishing paint coating, the coating is dried at room temperature for 7 days to obtain an anticorrosive coating system. The performance of the paint is tested, the paint resists cathode stripping and soaking for 180 days, the salt spray resistance time is more than or equal to 8000h, and the adhesive force is 15.6 MPa.

Example 4

Before coating, the surface of a steel plate with the thickness of 3mm is subjected to oil and rust removal treatment, the surface is subjected to sand blasting to Sa2.5 level, visible rust, dirt, oxide skin and foreign matters do not exist on the surface after the sand blasting is finished, and surface dust is blown clean by dry compressed air. And (3) spraying the graphene zinc-rich primer by adopting an air spraying method, wherein the thickness of a dry film is 70 mu m, and coating the epoxy micaceous iron intermediate paint after the primer is dried for 6 h. The intermediate paint coating process can adopt spraying and brushing, if the intermediate paint coating process adopts brushing, the intermediate paint is brushed for four times at an interval of 0.5h, and the thickness of a dry film is 330 mu m. After the intermediate paint is coated, the paint is dried for 24 hours, and the polyurethane finish paint can be sprayed, wherein the dry film thickness of the finish paint is 110 mu m. After finishing paint coating, the coating is dried at room temperature for 7 days to obtain an anticorrosive coating system. The performance of the paint is tested, the paint resists cathode stripping and soaking for 180 days, the salt spray resistance time is more than or equal to 8000h, and the adhesive force is 14.6 MPa.

Example 5

Before coating, the surface of a steel plate with the thickness of 3mm is subjected to oil and rust removal treatment, the surface is subjected to sand blasting to Sa2.5 level, visible rust, dirt, oxide skin and foreign matters do not exist on the surface after the sand blasting is finished, and surface dust is blown clean by dry compressed air. And (3) spraying the graphene zinc-rich primer by adopting an air spraying method, wherein the thickness of a dry film is 40 mu m, and coating the epoxy micaceous iron intermediate paint after the primer is dried for 6 h. The intermediate paint coating process can adopt spraying and brushing, if brushing is adopted, the intermediate paint is brushed for four times at an interval of 0.5h, and the dry film thickness is 320 mu m. After the intermediate paint is coated, the paint is dried for 24 hours, fluorocarbon finish paint can be sprayed, and the thickness of the dry film of the finish paint is 80 mu m. After finishing paint coating, the coating is dried at room temperature for 7 days to obtain an anticorrosive coating system. The performance of the paint is tested, the cathodic disbonding resistance is 180d, the salt spray resistance time is 6000h, and the adhesive force is 14.9 MPa.

Example 6

Before coating, the surface of a steel plate with the thickness of 3mm is subjected to oil and rust removal treatment, the surface is subjected to sand blasting to Sa2.5 level, visible rust, dirt, oxide skin and foreign matters do not exist on the surface after the sand blasting is finished, and surface dust is blown clean by dry compressed air. And (3) spraying the graphene zinc-rich primer by adopting an air spraying method, wherein the thickness of a dry film is 50 mu m, and coating the epoxy micaceous iron intermediate paint after the primer is dried for 6 h. The intermediate paint coating process can adopt spraying and brushing, if the intermediate paint coating process adopts brushing, the intermediate paint is brushed for four times at an interval of 0.5h, and the dry film thickness is 340 mu m. After the intermediate paint is coated, the paint is dried for 24 hours, fluorocarbon finish paint can be sprayed, and the thickness of the dry film of the finish paint is 90 mu m. After finishing paint coating, the coating is dried at room temperature for 7 days to obtain an anticorrosive coating system. The performance of the paint is tested, the paint resists cathode stripping and soaking for 180 days, the salt spray resistance time is more than or equal to 8000h, and the adhesive force is 15.4 MPa.

Example 7

Before coating, the surface of a steel plate with the thickness of 3mm is subjected to oil and rust removal treatment, the surface is subjected to sand blasting to Sa2.5 level, visible rust, dirt, oxide skin and foreign matters do not exist on the surface after the sand blasting is finished, and surface dust is blown clean by dry compressed air. And (3) spraying the graphene zinc-rich primer by adopting an air spraying method, wherein the thickness of a dry film is 60 mu m, and coating the epoxy micaceous iron intermediate paint after the primer is dried for 6 h. The intermediate paint coating process can adopt spraying and brushing, if the intermediate paint coating process adopts brushing, the intermediate paint is brushed for four times at an interval of 0.5h, and the thickness of a dry film is 330 mu m. After the intermediate paint is coated, the paint is dried for 24 hours, and fluorocarbon finish paint can be sprayed, wherein the thickness of a dry film of the finish paint is 100 mu m. After finishing paint coating, the coating is dried at room temperature for 7 days to obtain an anticorrosive coating system. The performance of the paint is tested, the paint resists cathode stripping and soaking for 180 days, the salt spray resistance time is more than or equal to 8000h, and the adhesive force is 14.6 MPa.

Example 8

Before coating, the surface of a steel plate with the thickness of 3mm is subjected to oil and rust removal treatment, the surface is subjected to sand blasting to Sa2.5 level, visible rust, dirt, oxide skin and foreign matters do not exist on the surface after the sand blasting is finished, and surface dust is blown clean by dry compressed air. And (3) spraying the graphene zinc-rich primer by adopting an air spraying method, wherein the thickness of a dry film is 70 mu m, and coating the epoxy micaceous iron intermediate paint after the primer is dried for 6 h. The intermediate paint coating process can adopt spraying and brushing, if brushing is adopted, the intermediate paint is brushed for four times at an interval of 0.5h, and the dry film thickness is 320 mu m. After the intermediate paint is coated, the paint is dried for 24 hours, fluorocarbon finish paint can be sprayed, and the thickness of the dry film of the finish paint is 110 mu m. After finishing paint coating, the coating is dried at room temperature for 7 days to obtain an anticorrosive coating system. The performance of the paint is tested, the cathodic disbonding resistance is 180d, the salt spray resistance time is 7500h, and the adhesive force is 14.3 MPa.

The paint film thickness and some properties of the paint films of examples 1 to 8 of the present invention are shown in Table 2 below.

TABLE 2 Corrosion protection coating thickness and Properties

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims (10)

1. An anticorrosive coating system of ocean wind turbine tower section of thick bamboo outer wall which characterized in that includes: a primer coating, an epoxy micaceous iron intermediate paint coating and a finish paint coating;

the primer coating is a graphene zinc-rich coating and is coated on the surface of the steel structure.

2. The system of claim 1, wherein the graphene zinc-rich coating has a dry film thickness of 40 μ ι η to 70 μ ι η.

3. The system according to claim 1, wherein the dry film thickness of the epoxy cloud iron intermediate paint coating is 320-340 μm.

4. The system of claim 3, wherein the epoxy mica intermediate paint coating is an epoxy mica intermediate paint containing scaly mica pigments.

5. The system of claim 1, wherein the topcoat coating is a polyurethane topcoat or a fluorocarbon topcoat coating.

6. The system of claim 5, wherein the dry film thickness of the topcoat coating is between 80 μ ι η and 110 μ ι η.

7. The system according to claim 1, wherein the total dry film thickness of the system is 440 to 520 μm.

8. A method of applying an anti-corrosive coating system for the outer wall of a tower of a marine wind turbine according to any one of claims 1 to 7, comprising:

carrying out oil and rust removal treatment on the surface of the steel plate, carrying out sand blasting on the surface to Sa2.5 level, and blowing clean by using dry compressed air;

spraying the graphene zinc-rich coating as a primer by adopting an air spraying method;

after the graphene zinc-rich coating is dried for 6 hours, coating an epoxy micaceous iron intermediate paint coating;

coating the epoxy micaceous iron intermediate paint, airing for 24 hours, and spraying a finish coat; and air-drying at room temperature for 7 days.

9. The method of claim 8, wherein applying the micaceous iron oxide intermediate paint coating comprises:

and spraying or brushing the epoxy micaceous iron intermediate paint coating.

10. The method of claim 9, wherein brushing the epoxy cloud intermediate coat comprises:

and brushing four epoxy micaceous iron intermediate paint coatings at intervals of 0.5 h.

Images