Surface coating repairing method for composite coating system

Abstract

The invention discloses a method for repairing a surface coating of a composite coating system. The method comprises the following steps: acquiring a measured value of a color value of the composite coating system near a to-be-repaired composite coating system; obtaining a color value influence factor corresponding to the composite coating system; and according to the obtained measured value of the color value of the composite coating system and the color value influence factor, the true value of the surface coating color of the composite coating system is obtained, and the surface coating is repaired according to the true value of the surface coating color. The real value of the surface coating color of the composite coating system is obtained according to the obtained measured value of the color value of the composite coating system and the color value influence factor, and the surface coating is repaired according to the real value of the surface coating color. The problem that color difference exists between the color of the colored paint after the surface coating is repaired and the color of the colored paint of an unrepaired part is reduced or eliminated.

Description

Technical Field

[0001] The invention belongs to the field of inspection and detection technology, and specifically relates to a method for repairing surface coating of a composite coating system. Background Art

[0002] The composite coating system on the aircraft surface adopts a combination of a base coating system and a surface coating, and the values ​​of brightness L, chromaticity a and chromaticity b of the composite coating system are specified. The color of the paint of the surface coating matches the color of the paint of the base coating system to form a two-color or multi-color composite coating system. In the multi-color composite coating system, the color of the paint of the surface coating fails and changes color due to various factors. For example, the color of the paint film in different parts is inconsistent due to poor hiding power and uneven film thickness of the surface coating; the surface coating is exposed to sunlight and atmospheric conditions outdoors, and the surface coating is photo-oxidative aging, which causes the surface coating to fall off, fade or change color. When the above phenomenon occurs in the surface coating, it is necessary to repair the surface coating of the composite coating system in time, and the color of the repaired paint is required to be uniform and consistent with the color of the paint of the unrepaired part. The existing conventional repair and maintenance method is to use new paint for repair. Because the color of the new paint is not corrected according to the original coating color, the color of the paint of the repaired surface coating and the color of the paint of the unrepaired part have a large color difference. Summary of the invention

[0003] The purpose of the present invention is to provide a composite coating system surface coating repair method to solve the problem of color difference between the color of the paint after the surface coating is repaired and the color of the paint of the unrepaired part.

[0004] The present invention is achieved through the following technical solutions:

[0005] A composite coating system surface coating repair method is used to repair the worn part of the surface coating in the composite coating system, comprising:

[0006] obtaining a measurement of a color value of a composite coating system located proximate to a composite coating system to be repaired;

[0007] Obtaining a color value influencing factor corresponding to the composite coating system, wherein the color value influencing factor is the influence of the bottom coating system in the composite coating system on the color value of the surface coating, wherein the bottom coating system is a coating system composed of other coatings in the composite coating system except the surface coating;

[0008] According to the measured value of the color value of the composite coating system and the color value influencing factor, the true value of the surface coating color of the composite coating system is obtained, and the surface coating is repaired according to the true value of the surface coating color.

[0009] In some embodiments, the step of obtaining the color value influencing factor corresponding to the composite coating system includes:

[0010] According to the color values ​​of the multiple groups of samples of the same composite coating system, the standard value of the color value of the composite coating system sample is calculated, and according to the standard value of the color value of the composite coating system sample and the color value of the surface coating of the composite coating system sample, the color value influencing factor corresponding to the composite coating system is obtained;

[0011] The same composite coating system samples are composite coating systems having the same number of coating layers and using the same materials for each coating layer.

[0012] In some embodiments, the step of calculating the standard value of the color value of the composite coating system sample includes:

[0013] According to the color values ​​of multiple groups of identical composite coating system samples obtained, the confidence interval of the color values ​​of the composite coating system samples at a preset confidence level is calculated, and the median of the confidence interval of the color values ​​of the composite coating system samples is used as the standard value of the color values ​​of the composite coating system samples.

[0014] In some embodiments, the true value of the surface coating color of the composite coating system is the difference between the measured value of the color value of the composite coating system and the color value influencing factor of the composite coating system.

[0015] In some embodiments, the color value of the composite coating system includes a lightness value L*, a chromaticity value a*, and a chromaticity value b* based on a Lab color space.

[0016] In some embodiments, the surface coating repair method of the composite coating system also includes the step of establishing a mapping relationship between different composite coating systems and corresponding color value influencing factors, obtaining the color value influencing factors of the corresponding composite coating system according to the mapping relationship between different composite coating systems and color value influencing factors, and repairing the surface coatings of different composite coating systems.

[0017] In some embodiments, by acquiring the color value influencing factors corresponding to different composite coating systems, a mapping relationship between different composite coating systems and the corresponding color value influencing factors is established.

[0018] In some embodiments, the step of obtaining the color value influencing factors of different composite coating systems includes:

[0019] For different composite coating systems, multiple groups of color values ​​of the corresponding composite coating systems are obtained respectively, and the standard values ​​of the color values ​​of the corresponding composite coating systems are calculated according to the multiple groups of color values. According to the standard values ​​of the color values ​​of the corresponding composite coating systems and the color values ​​of the surface coatings of the corresponding composite coating systems, the color value influencing factors of the underlying coating systems on the color values ​​of the surface coatings in each composite coating system are obtained.

[0020] In some embodiments, the step of obtaining multiple sets of color values ​​corresponding to the composite coating system includes:

[0021] A plurality of groups of identical composite coating system samples are prepared for different composite coating systems, and the color values ​​of the plurality of groups of identical composite coating system samples are measured to obtain a plurality of groups of color values ​​of the corresponding composite coating systems; the identical composite coating system samples are composite coating systems having the same number of coating layers and the same materials used in each coating layer.

[0022] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0023] 1. The true value of the surface coating color of the composite coating system is obtained based on the measured value of the color value of the composite coating system and the color value influencing factor. The surface coating is repaired by the true value of the surface coating color obtained based on the color value influencing factor, which can effectively reduce or eliminate the color difference between the color of the paint after the surface coating is repaired and the color of the paint of the unrepaired part.

[0024] 2. By establishing a mapping relationship between different composite coating systems and corresponding color value influencing factors, when repairing the surface coatings of different composite coating systems, the color value influencing factors corresponding to the composite coating systems can be quickly obtained, so that it can be suitable for the repair of different composite coating systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 The figure is a flow chart of surface coating repair of a composite coating system in an embodiment of the present invention.

[0027] Figure 2 Schematic diagram of color value influencing factors of the composite coating system in an embodiment of the present invention.

[0028] Figure 3Schematic diagram of the actual value of the surface coating color of the composite coating system in an embodiment of the present invention.

[0029] Figure 4 It is a sub-interval frequency distribution line graph of the brightness value L* of the color value of the composite coating system sample in the embodiment of the present invention.

[0030] Figure 5 It is a sub-interval frequency distribution line graph of the chromaticity value a* of the color value of the composite coating system sample in the embodiment of the present invention.

[0031] Figure 6 A line graph showing the sub-interval frequency distribution of the chromaticity value b* of the color value of the composite coating system sample in an embodiment of the present invention.

[0032] Figure 7 Standard normal distribution curve of color values ​​of composite coating system samples in an embodiment of the present invention. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0034] Example 1

[0035] In the repair of the surface coating of the composite coating system on the aircraft surface, there is a problem of color difference between the repaired coating system and the unrepaired coating system. There are many factors that cause color difference during the repair. In addition to external controllable factors, there are also factors affecting the inherent spectral characteristics of the composite coating system.

[0036] The composite coating system on the aircraft surface is a multi-coating system composed of different types of coatings. Different types of coatings achieve specific color effects through the projection, reflection and absorption of different light. When different types of coatings are superimposed together, the spectral characteristics of the composite coating system will be affected, resulting in certain changes in the color of the paint, causing color difference. Therefore, when repairing the surface coating, in order to reduce or eliminate the color difference between the color of the repaired paint and the color of the paint of the unrepaired part, it is necessary to know the impact value of the bottom coating system in the composite coating system on the color value of the surface coating, and obtain the true value of the color value of the surface coating based on the impact value to solve the problem of color difference.

[0037] It is assumed that the composite coating system of the aircraft is composed of four coatings of different materials and different colors, namely A coating, B coating, C coating and D coating. A coating is the surface coating, and the B coating, C coating and D coating are superimposed to form the underlying coating system. The color value influencing factor is the influence value of the underlying coating system in the composite coating system on the color value of the surface coating.

[0038] The color value of the composite coating system minus the color value of the surface coating is the color value influencing factor, which is recorded as (A+B+C+D)-A=color value influencing factor. Figure 2 .

[0039] The color value of the composite coating system near the composite coating system to be repaired is used as the reference color value of the surface coating after repair, so that the color value of the repaired part is consistent with the color value of the composite coating system near the part to be repaired. Due to the influence of the underlying coating system on the color value of the surface coating, the measured value of the color value of the composite coating system near the part to be repaired cannot be directly used as the repaired color value, because the measured value of the color value of the composite coating system near the part to be repaired is the color value of the composite coating system, not the color value of the surface coating alone. Therefore, the measured value of the color value of the composite coating system is subtracted from the color value influencing factor to obtain the true value of the color of the surface coating used for repair, which is recorded as (A+B+C+D)-influencing factor BCD =A, reference Figure 3 .

[0040] When repairing the surface coating of a composite coating system, the actual value of the surface coating color is used for repair so that the color of the repaired paint is consistent with the color of the paint of the unrepaired part.

[0041] Based on the above technical ideas, in some embodiments of the present invention, the surface coating repair method of the composite coating system is as follows: Figure 1 ,include:

[0042] obtaining a measurement of a color value of a composite coating system located proximate to a composite coating system to be repaired;

[0043] Obtaining a color value influencing factor corresponding to the composite coating system, wherein the color value influencing factor is the influence of the bottom coating system in the composite coating system on the color value of the surface coating, wherein the bottom coating system is a coating system composed of other coatings in the composite coating system except the surface coating;

[0044] According to the measured value of the color value of the composite coating system and the color value influencing factor, the true value of the surface coating color of the composite coating system is obtained, and the surface coating is repaired according to the true value of the surface coating color.

[0045] In some embodiments, the step of obtaining the color value influencing factor corresponding to the composite coating system includes:

[0046] According to the color values ​​of the multiple groups of samples of the same composite coating system, the standard value of the color value of the composite coating system sample is calculated, and according to the standard value of the color value of the composite coating system sample and the color value of the surface coating of the composite coating system sample, the color value influencing factor corresponding to the composite coating system is obtained;

[0047] The same composite coating system samples are composite coating systems having the same number of coating layers and using the same materials for each coating layer.

[0048] In some embodiments, the step of calculating a standard value of a color value of a composite coating system sample includes:

[0049] According to the color values ​​of multiple groups of identical composite coating system samples obtained, the confidence interval of the color values ​​of the composite coating system samples at a preset confidence level is calculated, and the median of the confidence interval of the color values ​​of the composite coating system samples is used as the standard value of the color values ​​of the composite coating system samples.

[0050] The confidence interval method and the median method are used to calculate the standard value of the color value corresponding to the composite coating system. The color value of the composite coating system should be normally distributed as a whole.

[0051] The following takes the color value of the composite coating system as an example, the brightness value L*, chromaticity value a* and chromaticity value b* based on the Lab color space, to analyze the distribution of the color value of the composite coating system.

[0052] It is assumed that the composite coating system of the aircraft is composed of the superposition of A coating, B coating, C coating and D coating, A coating is the surface coating, and the superposition of B coating, C coating and D coating constitutes the bottom coating system, and the color paints used in A coating, B coating, C coating and D coating are of different types and / or different colors.

[0053] According to the above composite coating system, 20 identical four-color composite coating system samples are made, and the color values ​​of each composite coating system sample are measured. The brightness value L*, chromaticity value a* and chromaticity value b* of the color value of each composite coating system sample are measured based on the Lab color space. The brightness value L*, chromaticity value a* and chromaticity value b* of the color value of the i-th composite coating system sample are respectively recorded as L* i , a* i , b* i , i=1,…,20, the measured color value data refer to Table 1.

[0054] Table 1 Color values ​​of various composite coating system samples

[0055] Sample No. 1 2 3 4 5 6 7 8 9 10 L* 72.12 72.137 72.138 72.154 72.156 72.165 72.172 72.174 72.178 72.185 a* -2.25 -2.215 -2.205 -2.195 -2.18 -2.145 -2.22 -2.19 -2.174 2.178 b* -0.877 -0.91 -0.866 -0.86 -0.8 -0.865 -0.858 -0.855 -0.833 -0.822 Sample No. 11 12 13 14 15 16 17 18 19 20 L* 72.19 72.192 72.195 72.2 72.208 72.21 72.246 72.264 72.282 72.3 a* -2.175 -2.1 -2.16 -2.158 -2.147 -2.225 -2.14 -2.138 -2.13 -2.235 b* -0.849 -0.844 -0.845 -0.83 -0.84 -0.825 -0.825 -0.82 -0.82 -0.835

[0056] According to the minimum and maximum values ​​of the brightness value L*, chromaticity value a*, and chromaticity value b* of the color values ​​of each composite coating system sample, the value range of the brightness value L*, chromaticity value a*, and chromaticity value b* is equally divided into 10 sub-intervals, and the frequency of the composite coating system samples in each sub-interval is obtained by statistics, refer to Table 2.

[0057] Table 2 Frequency of composite coating system samples in each sub-interval

[0058]

[0059]

[0060] According to Table 2, a sub-interval frequency distribution line graph of the brightness value L*, chromaticity value a*, and chromaticity value b* of the composite coating system sample color value is drawn. Figure 4 , Figure 5 , Figure 6 .

[0061] The line graphs of the brightness value L*, chromaticity value a*, and chromaticity value b* of the composite coating system sample color value were analyzed, and it was found that each line graph showed a normal distribution with low sides and high middle. The standard normal distribution curve, referring to Figure 7 It can be seen that the distribution of the color values ​​of the composite coating system samples roughly fluctuates around a "certain standard value". The "certain standard value" is set as the median, and the confidence interval method is used to obtain the range of approximate standard values ​​of the color values ​​of the composite coating system samples.

[0062] From the perspective of mathematical statistics and probability theory, the color values ​​of the samples of each composite coating system can be judged to be normally distributed overall, that is, distributed around the median. As the number of samples of the composite coating system increases, the median will infinitely approach the standard value, and the approximate value will be used instead of the standard value. If the color values ​​of the samples of each composite coating system include the standard value, the minimum and maximum values ​​of the color values ​​of the samples of the composite coating system are used as the standard value interval of the color values ​​of the samples of the composite coating system; if there is a more accurate sub-interval in the standard value interval of the color values ​​of the samples of the composite coating system, the sub-interval is obtained by interval estimation, and then the standard value is approximately determined by the median method.

[0063] Among them, the median is the number in the middle position of a set of data arranged in order, that is, in this set of data, half of the data is larger than it, and half of the data is smaller than it; if the number of values ​​greater than the median and less than the median is less than half, then there must be some values ​​in this set of data that are equal to the median.

[0064] The surface coating repair method of the composite coating system adopted by the present invention is described below with reference to specific embodiments.

[0065] A method for repairing a surface coating of a composite coating system, comprising:

[0066] The color value of the composite coating system near the composite coating system to be repaired is measured to obtain a measured value of the color value of the composite coating system near the composite coating system to be repaired.

[0067] It is assumed that the composite coating system to be repaired is composed of A coating, B coating, C coating and D coating superimposed on each other, A coating is the surface coating, B coating, C coating and D coating are superimposed to form the bottom coating system, and the color paints used in A coating, B coating, C coating and D coating are of different types and / or different colors.

[0068] According to the set composite coating system to be repaired, multiple groups of identical composite coating system samples are made, and the multiple groups of identical composite coating system samples are measured to obtain color values ​​of the multiple groups of identical composite coating system samples, and the brightness value L*, chromaticity value a* and chromaticity value b* of the color values ​​of the multiple groups of identical composite coating system samples are obtained based on the Lab color space.

[0069] According to the brightness value L*, chromaticity value a* and chromaticity value b* of the color values ​​of multiple groups of the same composite coating system samples, the average values ​​of the brightness value L*, chromaticity value a* and chromaticity value b* of the color values ​​of the composite coating system samples are calculated respectively.

[0070] According to the lightness value L*, chromaticity value a*, chromaticity value b* of the color values ​​of multiple groups of the same composite coating system samples and the average value of the lightness value L*, chromaticity value a*, chromaticity value b* of the color values ​​of the composite coating system samples The variance values ​​σL*, σa*, and σb* of the brightness value L*, chromaticity value a*, and chromaticity value b* of the color value of the composite coating system are calculated respectively.

[0071] The calculation formulas for the variance values ​​σL*, σa*, and σb* are:

[0072]

[0073] According to the average value of the lightness value L*, chromaticity value a*, chromaticity value b* of the color value of the composite coating system sample The confidence intervals of the brightness value L*, chromaticity value a*, and chromaticity value b* of the color values ​​of the composite coating system samples were calculated using the variance values ​​σL*, σa*, and σb*, respectively.

[0074] The confidence intervals of the brightness value L*, chromaticity value a*, and chromaticity value b* of the color value of the composite coating system sample can be expressed as:

[0075] Confidence interval for L*:

[0076] Confidence interval for a*:

[0077] Confidence interval for b*:

[0078] The confidence level of the color value of the composite coating system sample is set to 1-α.

[0079] According to the confidence interval, confidence level and quantile value table of the brightness value L*, chromaticity value a* and chromaticity value b* of the color value of the composite coating system sample, the intervals of the brightness L*, chromaticity value a* and chromaticity value b* of the color value of the composite coating system sample at the preset confidence level are calculated respectively, and the median of the intervals of the brightness L*, chromaticity value a* and chromaticity value b* of the color value of the composite coating system sample at the preset confidence level is taken as the standard value of the brightness L*, chromaticity value a* and chromaticity value b* of the color value of the composite coating system sample, and the standard value of the color value of the composite coating system sample is obtained based on the Lab color space.

[0080] According to the standard value of the color value of the composite coating system sample and the color value of the surface coating of the composite coating system sample, the color value influencing factor corresponding to the composite coating system is obtained.

[0081] When repairing the surface coating of the composite coating system, the true value of the surface coating color of the composite coating system is obtained by subtracting the color value influencing factor of the composite coating system from the measured value of the color value of the composite coating system, and the surface coating is repaired according to the true value of the surface coating color.

[0082] The true value of the surface coating color of the composite coating system is obtained based on the measured value of the color value of the composite coating system and the color value influencing factor. The surface coating is repaired by the true value of the surface coating color obtained based on the color value influencing factor. This can effectively reduce or eliminate the color difference between the color of the paint after the surface coating is repaired and the color of the paint of the unrepaired part.

[0083] Furthermore, lowering the confidence level and narrowing the confidence interval can improve the degree of color difference correction and reduce or eliminate color difference.

[0084] Furthermore, a plurality of groups of identical composite coating system samples are prepared for different composite coating systems, and the color values ​​of the plurality of groups of identical composite coating system samples are measured to obtain a plurality of groups of color values ​​of the corresponding composite coating systems; the identical composite coating system samples are composite coating systems having the same number of coating layers and the same materials used in each coating layer;

[0085] For different composite coating system samples, multiple groups of color values ​​of the corresponding composite coating system samples are obtained respectively, and the standard values ​​of the color values ​​of the corresponding composite coating system samples are calculated according to the multiple groups of color values; according to the standard values ​​of the color values ​​of the corresponding composite coating system samples and the color values ​​of the surface coatings of the corresponding composite coating systems, the color value influencing factors of the underlying coating systems on the color values ​​of the surface coatings in different composite coating systems are obtained.

[0086] According to the color value influencing factors corresponding to different composite coating systems, a mapping relationship between different composite coating systems and the corresponding color value influencing factors is established.

[0087] Suppose X is a set of color values ​​of the composite coating system, x is a color value of a specific composite coating system in the set, that is, x∈X, y is the color value influencing factor value of the specific composite coating system, and the set where y belongs is Y. Then there is a set Y={f(x)|x∈X}, and a mapping relationship f:X→Y is established.

[0088] According to the mapping relationship between different composite coating systems and color value influencing factors, the color value influencing factors of the corresponding composite coating systems are obtained, and the surface coatings of the different composite coating systems are repaired.

[0089] By establishing a mapping relationship between different composite coating systems and corresponding color value influencing factors, when repairing the surface coatings of different composite coating systems, the color value influencing factors corresponding to the composite coating systems can be quickly obtained, thereby being applicable to the repair of different composite coating systems.

[0090] The steps to obtain the color value influencing factors of different composite coating systems include:

[0091] For different composite coating systems, multiple groups of color values ​​of the corresponding composite coating systems are obtained respectively, and the standard values ​​of the color values ​​of the corresponding composite coating systems are calculated according to the multiple groups of color values. According to the standard values ​​of the color values ​​of the corresponding composite coating systems and the color values ​​of the surface coatings of the corresponding composite coating systems, the color value influencing factors of the underlying coating systems on the color values ​​of the surface coatings in each composite coating system are obtained.

[0092] The steps of obtaining a plurality of sets of color values ​​corresponding to the composite coating system include:

[0093] A plurality of groups of identical composite coating system samples are prepared for different composite coating systems, and the color values ​​of the plurality of groups of identical composite coating system samples are measured to obtain a plurality of groups of color values ​​of the corresponding composite coating systems; the identical composite coating system samples are composite coating systems having the same number of coating layers and the same materials used in each coating layer.

[0094] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A method for repairing a surface coating of a composite coating system, used to repair a worn portion of a surface coating of a composite coating system, characterized in that: include: obtaining a measurement of a color value of a composite coating system located proximate to a composite coating system to be repaired; Obtaining a color value influencing factor corresponding to the composite coating system, wherein the color value influencing factor is the influence of the bottom coating system in the composite coating system on the color value of the surface coating, wherein the bottom coating system is a coating system composed of other coatings in the composite coating system except the surface coating; According to the measured value of the color value of the composite coating system and the color value influencing factor, the true value of the surface coating color of the composite coating system is obtained, and the surface coating is repaired according to the true value of the surface coating color.

2. A composite coating system surface coating repair method according to claim 1, characterized in that: The step of obtaining the color value influencing factor corresponding to the composite coating system includes: According to the color values ​​of multiple groups of samples of the same composite coating system, the standard value of the color value of the composite coating system sample is calculated, and according to the standard value of the color value of the composite coating system sample and the color value of the surface coating of the composite coating system sample, the color value influencing factor corresponding to the composite coating system is obtained; The same composite coating system samples are composite coating systems with the same number of coating layers and the same materials used in each coating layer.

3. A composite coating system surface coating repair method according to claim 2, characterized in that: The step of calculating the standard value of the color value of the composite coating system sample comprises: According to the color values ​​of multiple groups of identical composite coating system samples obtained, the confidence interval of the color values ​​of the composite coating system samples at a preset confidence level is calculated, and the median of the confidence interval of the color values ​​of the composite coating system samples is used as the standard value of the color values ​​of the composite coating system samples.

4. A composite coating system surface coating repair method according to claim 1, characterized in that: The true value of the surface coating color of the composite coating system is the difference between the measured value of the color value of the composite coating system and the color value influencing factor of the composite coating system.

5. The surface coating repair method of a composite coating system according to claim 1, characterized in that: The color value of the composite coating system includes a lightness value L*, a chromaticity value a*, and a chromaticity value b* based on the Lab color space.

6. A composite coating system surface coating repair method according to claim 1, characterized in that: The method for repairing the surface coating of a composite coating system also includes the step of establishing a mapping relationship between different composite coating systems and corresponding color value influencing factors, and obtaining the color value influencing factors of the corresponding composite coating system based on the mapping relationship between different composite coating systems and color value influencing factors, and repairing the surface coatings of different composite coating systems.

7. A composite coating system surface coating repair method according to claim 6, characterized in that: By acquiring the color value influencing factors corresponding to different composite coating systems, a mapping relationship between different composite coating systems and the corresponding color value influencing factors is established.

8. A composite coating system surface coating repair method according to claim 7, characterized in that: The steps to obtain the color value influencing factors of different composite coating systems include: For different composite coating systems, multiple groups of color values ​​of the corresponding composite coating systems are obtained respectively, and the standard values ​​of the color values ​​of the corresponding composite coating systems are calculated according to the multiple groups of color values. According to the standard values ​​of the color values ​​of the corresponding composite coating systems and the color values ​​of the surface coatings of the corresponding composite coating systems, the color value influencing factors of the underlying coating systems on the color values ​​of the surface coatings in each composite coating system are obtained.

9. A composite coating system surface coating repair method according to claim 8, characterized in that: The step of obtaining multiple sets of color values ​​corresponding to the composite coating system includes: A plurality of groups of identical composite coating system samples are prepared for different composite coating systems, and the color values ​​of the plurality of groups of identical composite coating system samples are measured to obtain a plurality of groups of color values ​​of the corresponding composite coating systems; the identical composite coating system samples are composite coating systems having the same number of coating layers and the same materials used in each coating layer.

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