Method for testing influence of mosquitoes on salt spray resistance of wind power blade coating

Abstract

The invention discloses a method for testing influence of mosquitoes on salt spray resistance of a wind power blade coating, and belongs to the technical field of wind power blades. The method comprises the following steps: firstly, acquiring a plurality of wind power blade simulators similar to the components of the wind power blade, taking one of the wind power blade simulators as a contrast piece, then taking a plurality of wind power blade simulators as test pieces, performing a mosquito test on the test pieces, then performing a salt spray test, and comparing the performances of the contrast piece and the test pieces. The influence result of the mosquitoes on the salt spray resistance of the wind power blade coating is obtained. According to the test method, the influence of mosquitoes on the salt spray resistance of the coating can be judged, then whether the coating and the construction technology of the corresponding wind power blade can meet the requirement of the blade for the weather resistance of the mosquitoes or not is judged, and finish paint or technology adjustment can be further conducted on a simulation piece according to the test result.

Description

Technical Field

[0001] The invention belongs to the technical field of wind turbine blade testing, and in particular relates to a method for testing the influence of mosquitoes on the salt spray resistance of a wind turbine blade coating. Background Art

[0002] As the global demand for clean energy grows, wind power generation, as a clean and renewable energy form, is becoming increasingly important. Wind turbines, the core equipment of wind power generation, are composed of multiple key components, among which the blades are the key components for capturing wind energy and converting it into mechanical energy. Their performance and durability have a decisive impact on the operating efficiency and life of the entire wind turbine.

[0003] The leading edge of the blade is the first part to contact the airflow, and it is very easy to accumulate pollutants such as the dead bodies of insects left after impact, dust in the air, and salt, forming a complex boundary layer. This boundary layer not only increases the roughness of the blade surface and reduces the aerodynamic performance, but also may cause chemical corrosion to the blade surface material due to the chemical substances such as uric acid and salt contained in it. In particular, the acidic properties of uric acid in the dead bodies of mosquitoes are corrosive to many materials, which can accelerate the degradation of the blade surface coating, thereby affecting the salt spray resistance and overall service life of the coating.

[0004] At present, the research and development and evaluation of wind turbine blade leading edge protection materials mainly focus on improving the wear resistance, aging resistance, weather resistance and other aspects of the materials to cope with general environmental erosion. However, there are few studies on the impact of salt spray on wind turbine blades. Salt spray is mainly formed by a mixture of salt and pollutants in the air. It is a grayish-white crystal that is angular and difficult to dissolve. It contains a large amount of strongly acidic metal salts and metal oxides. When salt spray adheres to the surface of the blade, it will increase the resistance of the blade and affect the running speed and efficiency of the blade. The strongly acidic substances in the salt spray will chemically corrode the surface material of the blade, especially when there are defects such as scratches and cracks on the surface of the blade, the corrosion effect is more significant. Long-term salt spray erosion will cause weathering and burring on the surface of the blade, which will seriously affect the structural integrity and service life of the blade. In addition, the salt spray particles will rub and collide with the surface of the blade under the action of wind force, resulting in physical wear of the surface material of the blade. This wear will increase the roughness of the blade surface and further reduce the aerodynamic performance of the blade.

[0005] Furthermore, in the evaluation system of salt spray resistance, the actual impact of biological factors such as mosquitoes on material performance is ignored, which may lead to deviations between the evaluation results and actual application conditions and fail to fully reflect the true performance of protective materials in complex environments. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a testing method for the influence of mosquitoes on the salt spray resistance of wind turbine blade coating, so as to solve the problem that it is difficult to react or evaluate the influence of mosquitoes on the coating performance of wind turbine blades during service in the prior art, and there is a lack of methods for testing the salt spray resistance of the leading edge of the blades.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coatings comprises the following steps:

[0009] Step 1, obtaining N wind turbine blade simulation parts with coatings on the surface, where N is a natural number ≥ 3;

[0010] Step 2, scratching a wind turbine blade simulation part, and subjecting the scratched wind turbine blade simulation part to a salt spray test to obtain a control part;

[0011] Step 3, collecting mosquitoes by a black box method, and obtaining N-1 black boxes containing mosquitoes;

[0012] Step 4, vertically placing N-1 wind turbine blade simulation parts in N-1 black boxes for collecting mosquitoes, and obtaining process wind turbine blades after the wind turbine blades are rotated and tested;

[0013] Step 5, performing a scratching process on the N-1 process wind turbine blades obtained in step 4 to obtain process wind turbine blades with scratches;

[0014] Step 6, subjecting the process wind turbine blade with scratches to a salt spray test to obtain a test wind turbine blade;

[0015] Step 7, respectively determine the failure modes of the control and test wind turbine blades, compare the failure results, and obtain the results of the impact of mosquitoes on the salt spray resistance of the wind turbine blades.

[0016] A further improvement of the present invention is:

[0017] Preferably, in step 1, the composition of the wind turbine blade simulation is the same as the composition of the leading edge of the actual wind turbine blade to be tested, and the coating composition is the same as the coating composition on the leading edge surface of the actual wind turbine blade.

[0018] Preferably, in the same test, the scratch treatment parameters in step 2 and step 5 are the same, and the salt spray test parameters in step 2 and step 6 are the same.

[0019] Preferably, during the scratching process, two cross scratches are scratched on the test surface of the wind turbine blade, each scratch has a width of 0.5 to 1.5 mm and a length of 5 to 10 cm, and the acute angle of the two cross scratches is 20 to 60°.

[0020] Preferably, in step 2 and step 6, the temperature during the salt spray test is 30-40° C., the mass concentration of the NaCl solution is 40-60 g / L, the pH value is 6.5-7.3, and the salt spray test time is 2000 h.

[0021] Preferably, in step 2 and step 6, during the salt spray test, the wind turbine blade simulation is placed at an angle of 45° relative to the horizontal plane.

[0022] Preferably, in step 3, the process of the black box method is: placing a black box at a monitoring point at dusk with the opening of the black box facing west, collecting mosquitoes the next day for identification and counting; the monitoring point is located at the working site of the wind turbine blade.

[0023] Preferably, in step 4, the rotation speed of the wind turbine blade during the rotation test is 20-60 r / min, and the rotation test time is 48 hours.

[0024] Preferably, in step 7, the failure modes include gloss loss, bubbles, powdering and cracking; and step 7 also includes an adhesion test.

[0025] Preferably, after step 7, the composition of the wind turbine blade and the composition of the wind turbine blade surface coating are adjusted according to the failure mode result.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The present invention discloses a test method for the effect of mosquitoes on the salt spray resistance of wind turbine blade coatings. The test method is based on a simulation part with the same material as the blade, and firstly applies a protective coating on the simulation part according to the actual operation process, and then performs a mosquito impact test on the protective paint, and then performs a salt spray resistance test on the blade coating to determine the failure mode of the coating's salt spray resistance. According to the failure mode of the coating's salt spray resistance, it is first possible to determine the effect of mosquitoes on the coating's salt spray resistance, and whether the coating and construction process can meet the blade's requirements for mosquito weather resistance. Further, according to the test results, the simulation part can be adjusted for topcoat or process. The application of this research test method can identify the effect of mosquitoes on the salt spray resistance of blade coatings, timely repair and clean wind turbine blades, prevent a significant decrease in the salt spray resistance of wind turbine blades, and ensure stable operation of blades.

[0028] Furthermore, the composition of the wind turbine blade simulation is the same as that of the leading edge of an actual wind turbine blade, and the coating composition is the same as that of the coating on the leading edge surface of an actual wind turbine blade, so that the wind turbine blade to be studied can be simulated in a targeted manner.

[0029] Furthermore, in the same experiment, the scratch and salt spray test conditions of the control piece and the test piece are the same, so that the control piece and the test piece are comparable.

[0030] Furthermore, suitable monitoring points are selected near the wind farm, and the black box method is used to collect and monitor the mosquito density near the wind farm, so that the mosquito environment and type can be consistent with the local area.

[0031] Furthermore, the wind turbine blade test piece is placed vertically in the above-mentioned black box and operated at the working speed of the wind turbine blade, which can fully simulate the working environment of the wind turbine blade. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 is a flow chart of the present invention;

[0033] Figure 2 This is a schematic diagram of the black box for collecting mosquitoes of the present invention. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0035] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] The present invention discloses a test method for the effect of mosquitoes on the salt spray resistance of wind turbine blade coating. The test method selects a protective coating on a substrate of the same material as the blade according to the actual operation process, first performs a mosquito impact test on the protective paint, and then performs a salt spray resistance test on the blade coating to determine the failure mode of the coating's salt spray resistance. The gloss loss, bubbles, powdering and cracking levels of the process parts and the test parts are evaluated respectively, and the adhesion test of the pull-apart method is performed. The corresponding performances of the process parts and the three groups of test parts are compared respectively. According to the comparison results, the effect of mosquitoes on the salt spray resistance of the coating can be determined, and whether the coating and the construction process can meet the requirements of the blade for mosquito salt spray resistance, and then the topcoat or process is adjusted accordingly. The application of this research test method can identify the effect of mosquitoes on the salt spray resistance of the blade coating, timely repair and clean the wind turbine blades, prevent the salt spray resistance of the wind turbine blades from decreasing significantly, and ensure the stable operation of the blades.

[0037] As mentioned in the background technology, there are few studies on the salt spray resistance of wind turbine blades in the prior art. For mosquitoes, since their bodies contain acidic substances such as uric acid, they are corrosive to wind turbine blades, which in turn affects the salt spray resistance of wind turbine blades. However, there are few studies on the impact of this performance.

[0038] To solve the above problems, see Figure 1The first aspect of the present invention discloses a method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coatings. The method specifically comprises the following steps:

[0039] Step 1, obtaining a plurality of wind turbine blade simulation parts with coatings on the surface, where N is a natural number ≥ 3;

[0040] In some embodiments of the present invention, in this step, the composition of the wind turbine blade simulation is consistent with the composition of the leading edge of the wind turbine blade, and the coating on the surface is consistent with the composition of the coating on the leading edge of the wind turbine blade.

[0041] In some embodiments of the present invention, in this step, the width of the wind turbine blade simulation is limited to 3-8 cm, the length is 50-120 cm, and the thickness is ≥5 mm; so that the size of the wind turbine blade can adapt to the subsequent mosquito test and salt spray test in the black box.

[0042] As a preferred solution, all wind turbine blade simulation parts used have the same composition, surface coating composition and external dimensions, which is convenient for subsequent comparative tests.

[0043] Step 2, performing a scratch treatment on a wind turbine blade simulation part and then conducting a salt spray test to obtain a control part;

[0044] In some embodiments of the present invention, in this step, the scratch width is 0.5 to 1.5 mm, the length is 5 to 10 cm, and the acute angle of the cross scratch is 20 to 60°, so as to obtain a wind turbine blade simulation part with scratches;

[0045] In some embodiments of the present invention, the temperature in the salt spray test chamber is 30-40° C., the mass concentration of the NaCl solution is 40-60 g / L, the pH value is 6.5-7.3, the process parts are placed at a 45° tilt, and the test time is 2000 h.

[0046] Preferably, the parameters during the salt spray test can be adjusted according to actual conditions.

[0047] Step 3, collecting mosquitoes by a black box method to obtain a black box containing mosquitoes, the number of black boxes being the same as the number of test pieces, which is N-1;

[0048] In some embodiments of the present invention, the specific process of the black box method is:

[0049] (1) Select appropriate monitoring points near the wind farm and use the black box method to collect and monitor the mosquito density near the wind farm.

[0050] (2) Select N-1 boxes with dimensions of 3m×3m×3m (27m 3), one end is open, the outside is painted black, and the inside is painted red or brown. The black exterior is used to attract mosquitoes, while the red or brown interior helps to capture mosquitoes.

[0051] (3) See Figure 2 , place the black box at the selected monitoring point at dusk, ensure that the opening of the black box faces west, and place it in a shaded place with grass and trees.

[0052] (4) On the next morning (e.g., before 10 a.m.), the black box is retrieved and the mosquitoes inside are collected using an electric mosquito suction device for identification and counting.

[0053] As a preferred solution, during the black box method of collecting mosquitoes, the monitoring point where the black box is placed is located at the working site of the wind turbine blades, so that the number and type of mosquitoes collected meet local conditions.

[0054] In this step, a black box of appropriate size is selected. If the size is too small, fewer mosquitoes will be collected and the mosquito impact test cannot be completed. If the size is too large, the mosquitoes will be more dispersed and the density will be small, and the mosquito impact rate will be low, which will affect the test effect.

[0055] Step 4, vertically placing N-1 wind turbine blade simulation parts in a black box for collecting mosquitoes, and obtaining a process wind turbine blade after a wind turbine blade rotation test;

[0056] In some embodiments of the present invention, the remaining wind turbine blade simulation parts in step 1 are placed in the above black box, and run at a speed of 20-60 r / min for 48 hours before stopping. In this process, the wind turbine blades are placed in a standing position in the black box, which can simulate the working conditions of the wind turbine blades.

[0057] Step 5, performing a scratching process on the N-1 process wind turbine blades obtained in step 4 to obtain process wind turbine blades with scratches;

[0058] In some embodiments of the present invention, in this step, the scratch width is 0.5 to 1.5 mm, the length is 5 to 10 cm, and the acute angle of the cross scratch is 20 to 60°, so as to obtain a wind turbine blade simulation part with scratches;

[0059] As a preferred solution, in the same test, the scratching parameters of the process and the scratching position on the blade are the same as those in step 2, so that all the above test experiments are comparable.

[0060] In some embodiments of the present invention, N is 4, so the number of control pieces in step 2 is 1 and the number of test pieces is 3. When the amount of test data meets the test conditions, the test cost can be reduced.

[0061] In some embodiments of the present invention, three groups of wind turbine blade simulation pieces are placed vertically in a black box for collecting mosquitoes, and two cross scratches are made on the surfaces of the three groups of simulation pieces where there are traces of insects and dirt.

[0062] Step 6, placing the process wind turbine blade with scratches in a salt spray test chamber, performing a salt spray test, and obtaining a test wind turbine blade;

[0063] In some embodiments of the present invention, the temperature in the salt spray test chamber is 30-40° C., the mass concentration of the NaCl solution is 40-60 g / L, the pH value is 6.5-7.3, the process parts are placed at a 45° tilt, and the test time is 2000 h.

[0064] As a preferred solution, in the same test, the salt spray test conditions are the same.

[0065] Step 7, respectively determine the failure modes of the control piece and the test wind turbine blade, compare the failure results, and obtain the results of the impact of mosquitoes on the wind turbine blade.

[0066] Specifically, the gloss loss, bubbles, powdering and cracking levels of the process parts and test parts were evaluated respectively, and the adhesion test was carried out by the pull-off method. The corresponding performance of the process parts and the three groups of test parts were compared respectively, and the influence of mosquitoes on the salt spray resistance of wind turbine blades was judged based on the comparison results.

[0067] In some embodiments of the present invention, after step 2, when the salt spray test is completed, the process piece is taken out from the salt spray test chamber, and the surface of the test piece is rinsed with deionized water to remove the test solution residue, thereby obtaining a wind turbine blade control piece.

[0068] In some embodiments of the present invention, after step 6, the test piece is taken out from the salt spray test chamber, and the surface of the test piece is rinsed with deionized water to remove the test solution residue.

[0069] Exemplarily, in step 3 and step 6, the salt spray test conditions are:

[0070] The temperatures are 30°C, 35°C, and 40°C;

[0071] The mass concentrations of NaCl solutions were 40 g / L, 50 g / L, and 60 g / L;

[0072] The pH values ​​are 6.5, 6.9 and 7.3 respectively.

[0073] The test panels were placed at a 45° tilt and the test time was 2000 hours.

[0074] Preferably, three test pieces are tested in parallel under each temperature, mass concentration of NaCl solution, and pH value condition.

[0075] The following is further described in conjunction with specific embodiments.

[0076] Example 1

[0077] Step 1: Select four wind turbine blades with a width of 5 cm, a length of 100 cm, and a thickness of 10 cm.

[0078] Step 2, select one of the wind turbine blades, make two cross scratches on it, the scratch width is 1mm, the length is 10cm, the acute angle of the cross scratch is 60°, and a scratched wind turbine blade simulation part is obtained; the salt spray test conditions are as follows: the temperature is 30°C, the mass concentration of the NaCl solution is 40g / L, the pH value is 6.5, the process part is placed at a 45° tilt, and the test time is 2000h.

[0079] Step 3, collecting mosquitoes by a black box method to obtain a black box containing mosquitoes.

[0080] Step 4: Place three wind turbine blade simulation components vertically in a black box containing mosquitoes, and run them at a speed of 50 r / min for 48 hours before stopping.

[0081] Step 5, scratching the process wind turbine blade obtained in step 4, with the scratching parameters being the same as those in step 2;

[0082] Step 6, subjecting the scratch-treated wind turbine blade to a salt spray test, with the same test parameters as step 2.

[0083] Step 7, determine the failure mode, and the test results are shown in Table 1 below.

[0084] Table 1 Salt spray resistance test results of the control piece and three groups of test pieces of Example 1

[0085]

[0086] Example 2

[0087] Step 1: Select four wind turbine blades with a width of 5 cm, a length of 100 cm, and a thickness of 10 cm.

[0088] Step 2, select one of the wind turbine blades, make two cross scratches on it, the scratch width is 1mm, the length is 10cm, the acute angle of the cross scratch is 60°, and a scratched wind turbine blade simulation part is obtained; the salt spray test conditions are as follows: the temperature is 35°C, the mass concentration of the NaCl solution is 50g / L, the pH value is 6.9, the process part is placed at a 45° tilt, and the test time is 2000h.

[0089] Step 3, collecting mosquitoes by a black box method to obtain a black box containing mosquitoes.

[0090] Step 4: Place three wind turbine blade simulation components vertically in a black box containing mosquitoes, and run them at a speed of 50 r / min for 48 hours before stopping.

[0091] Step 5, scratching the process wind turbine blade obtained in step 4, with the scratching parameters being the same as those in step 2;

[0092] Step 6, subjecting the scratch-treated wind turbine blade to a salt spray test, with the same test parameters as step 2.

[0093] Step 7, determine the failure mode, and the test results are shown in Table 2 below.

[0094] Table 2 Salt spray resistance test results of the control piece and three groups of test pieces of Example 2

[0095]

[0096] Example 3

[0097] Step 1: Select four wind turbine blades with a width of 5 cm, a length of 100 cm, and a thickness of 10 cm.

[0098] Step 2, select one of the wind turbine blades, make two cross scratches on it, the scratch width is 1mm, the length is 10cm, the acute angle of the cross scratch is 60°, and a scratched wind turbine blade simulation part is obtained; the salt spray test conditions are as follows: the temperature is 40°C, the mass concentration of the NaCl solution is 60g / L, the pH value is 7.3, the process part is placed at a 45° tilt, and the test time is 2000h.

[0099] Step 3, collecting mosquitoes by a black box method to obtain a black box containing mosquitoes.

[0100] Step 4: Place three wind turbine blade simulation components vertically in a black box containing mosquitoes, and run them at a speed of 50 r / min for 48 hours before stopping.

[0101] Step 5, scratching the process wind turbine blade obtained in step 4, with the scratching parameters being the same as those in step 2;

[0102] Step 6, subjecting the scratch-treated wind turbine blade to a salt spray test, with the same test parameters as step 2.

[0103] Step 7, determine the failure mode, and the test results are shown in Table 3 below.

[0104] Table 3 Salt spray resistance test results of the control piece and three groups of test pieces of Example 3

[0105]

[0106] Based on the comparison of the salt spray resistance of the above process parts and the test parts, the influence of mosquitoes on the salt spray resistance of wind turbine blades can be determined.

[0107] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more. In the description of the present invention, the first feature "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features not being in direct contact but being in contact through another feature between them.

[0108] In the description of the present invention, “on”, “over” and “above” a first feature from a second feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0109] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0110] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0111] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0112] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A test method for the effect of mosquitoes on the salt spray resistance of wind turbine blade coating, characterized in that: The following steps are involved: Step 1, obtaining N wind turbine blade simulation parts with coatings on the surface, where N is a natural number ≥ 3; Step 2, scratching a wind turbine blade simulation part, and subjecting the scratched wind turbine blade simulation part to a salt spray test to obtain a control part; Step 3, collecting mosquitoes by a black box method, and obtaining N-1 black boxes containing mosquitoes; Step 4, vertically placing N-1 wind turbine blade simulation parts in N-1 black boxes for collecting mosquitoes, and obtaining process wind turbine blades after the wind turbine blades are rotated and tested; Step 5, performing a scratching process on the N-1 process wind turbine blades obtained in step 4 to obtain process wind turbine blades with scratches; Step 6, subjecting the process wind turbine blade with scratches to a salt spray test to obtain a test wind turbine blade; Step 7, respectively determine the failure modes of the control and test wind turbine blades, compare the failure results, and obtain the results of the impact of mosquitoes on the salt spray resistance of the wind turbine blades.

2. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to claim 1, characterized in that: In step 1, the composition of the wind turbine blade simulation is the same as the composition of the leading edge of the actual wind turbine blade to be tested, and the coating composition is the same as the coating composition on the leading edge surface of the actual wind turbine blade.

3. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to claim 1, characterized in that: In the same test, the scratch treatment parameters in step 2 and step 5 are the same, and the salt spray test parameters in step 2 and step 6 are the same.

4. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to claim 3 is characterized in that: During the scratching process, two cross scratches are made on the test surface of the wind turbine blade, each scratch has a width of 0.5 to 1.5 mm and a length of 5 to 10 cm, and the acute angle of the two cross scratches is 20 to 60°.

5. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to claim 3, characterized in that: In step 2 and step 6, the temperature during the salt spray test is 30-40° C., the mass concentration of the NaCl solution is 40-60 g / L, the pH value is 6.5-7.3, and the salt spray test time is 2000 h.

6. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to claim 5, characterized in that: In step 2 and step 6, the wind turbine blade simulation is placed at an angle of 45° relative to the horizontal plane during the salt spray test.

7. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to claim 1, characterized in that: In step 3, the process of the black box method is: placing a black box at a monitoring point at dusk with the opening of the black box facing west, collecting mosquitoes the next day for identification and counting; the monitoring point is located at the working site of the wind turbine blade.

8. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to claim 1, characterized in that: In step 4, the rotation speed of the wind turbine blade during the rotation test is 20 to 60 r / min, and the rotation test time is 48 hours.

9. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to claim 1, characterized in that: In step 7, the failure modes include gloss loss, bubbles, chalking and cracking; step 7 also includes adhesion testing.

10. The method for testing the effect of mosquitoes on the salt spray resistance of wind turbine blade coating according to any one of claims 1 to 9, characterized in that: After step 7, the composition of the wind turbine blade and the composition of the coating on the surface of the wind turbine blade are adjusted according to the failure mode results.

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