Inspection method of aluminum extrusion profile

Abstract

The invention relates to an inspection method of an aluminum extruded section, which is used for pre-judging different colors of the aluminum extruded section after anodic oxidation, and comprises the following steps of: providing the aluminum extruded section; polishing the test surface of the aluminum extrusion profile; the aluminum extrusion profile is soaked in a test solution for corrosion, the test solution is a first test solution or a second test solution, the first test solution comprises an aqueous solution of phosphoric acid, the mass percentage concentration of the phosphoric acid is 80%-90%, the second test solution is an aqueous solution of sodium hydroxide, and the mass percentage concentration of the sodium hydroxide is 1%-2%; and judging whether the aluminum extrusion profile is abnormal or not according to the corrosion degree of the test surface of the aluminum extrusion profile, if the corrosion degree reaches or exceeds a preset corrosion degree, judging that the aluminum extrusion profile is abnormal, and otherwise, judging that the aluminum extrusion profile is qualified. According to the inspection method, anodic oxidation of products unqualified in heat treatment is effectively avoided, production waste is effectively avoided, the production cycle of the products is shortened, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to a method for inspecting aluminum extruded profiles. Background Art

[0002] During the heat treatment (such as solution and aging treatment) of traditional aluminum extrusions, the temperature and time control of the heat treatment deviate, resulting in abnormalities in the material of the aluminum extrusions, which in turn affects the performance of the material. At this time, it is impossible to judge the abnormality of the aluminum extrusions after heat treatment from the appearance. After the abnormal aluminum extrusions are subsequently anodized, obvious discoloration will be observed. Since the defects caused by the heat treatment of aluminum extrusion products cannot be effectively discovered before anodization, products that fail the heat treatment (solid solution and aging treatment) are still anodized, which causes waste in production, resulting in a long production cycle and high production costs. Summary of the invention

[0003] In view of the defects existing in the prior art, the object of the present invention is to provide an inspection method for aluminum extruded profiles, which is used for pre-inspection of aluminum extruded profiles before anodizing.

[0004] In view of this, the present application provides an inspection method for aluminum extrusion profiles, which is used to predict in advance whether the aluminum extrusion profiles have different colors after anodizing, including: Provide aluminum extrusion profiles; Polishing the test surface of the aluminum extruded profile; Immersing the aluminum extruded profile in a test solution for corrosion, wherein the test solution is a first test solution or a second test solution, wherein the first test solution includes an aqueous solution of phosphoric acid, wherein the mass percentage concentration of the phosphoric acid is 80%-90%, and the second test solution includes an aqueous solution of sodium hydroxide, wherein the mass percentage concentration of the sodium hydroxide is 1%-2%; and Whether the aluminum extruded profile is abnormal is judged according to the corrosion degree of the test surface of the aluminum extruded profile. If the corrosion degree reaches or exceeds the preset corrosion degree, the aluminum extruded profile is judged to be abnormal. Otherwise, the aluminum extruded profile is judged to be qualified.

[0005] The inspection method of aluminum extrusion profiles in the present application can be used to predict in advance whether the workpiece formed by the aluminum extrusion profile will have different colors after anodizing. It only needs to polish and corrode the aluminum extrusion profile, and then judge whether the corrosion degree exceeds the preset corrosion degree to judge whether the aluminum extrusion profile is qualified. Therefore, the inspection method effectively avoids the anodizing treatment of products that fail the heat treatment (solid solution and aging treatment), thus effectively avoiding production waste, shortening the production cycle of the product and reducing production costs.

[0006] In some implementations, polishing the test surface of the aluminum extruded profile includes: polishing the test surface of the aluminum extruded profile with sandpaper.

[0007] In some embodiments, the step of polishing the test surface of the aluminum extrusion profile with sandpaper comprises: The test surface of the aluminum extruded profile was coarsely polished using 800-mesh sandpaper, medium-polished using 1200-mesh sandpaper, and fine-polished using 2000-mesh sandpaper.

[0008] In some implementations, polishing the test surface of the aluminum extruded profile with sandpaper further comprises: polishing the test surface of the aluminum extruded profile with aluminum polishing paste after polishing with sandpaper.

[0009] In some embodiments, before immersing the aluminum extruded profile in the test solution, the inspection method further comprises: wiping the polished test surface of the aluminum extruded profile with anhydrous alcohol and drying it; After immersing the aluminum extruded profile in the test solution, the inspection method further comprises: taking the aluminum extruded profile out of the test solution, and washing and drying the aluminum extruded profile.

[0010] In some embodiments, immersing the aluminum extruded profile in the test solution for corrosion comprises: When the first test solution is used, the first test solution is maintained at a temperature of 75-85° C. and the soaking time is 50-70 seconds; When the second test solution is used, the second test solution is maintained at a temperature of 70-80° C. and the immersion time is 160-200 seconds.

[0011] In some embodiments, determining whether the aluminum extruded profile is abnormal includes: providing a critical reference sample of the aluminum extruded profile, comparing a test surface of the aluminum extruded profile with a reference surface of the reference sample, and determining whether the aluminum extruded profile is abnormal.

[0012] In some implementations, if the matte degree of the test surface of the aluminum extruded profile is greater than or equal to the matte degree of the reference surface, the aluminum extruded profile is determined to be abnormal.

[0013] In some embodiments, a microscope is used to capture a partial magnified image of the test surface of the aluminum extruded profile and a partial magnified image of the reference surface of the reference sample; The density of the corrosion black spots in the local enlarged image is observed. If the density of the corrosion black spots on the test surface is greater than or equal to the density of the corrosion black spots on the reference surface, the aluminum extruded profile is judged to be abnormal.

[0014] In some embodiments, the reference sample providing the critical value of the aluminum extruded profile comprises: Providing an aluminum extruded profile sample, wherein the aluminum extruded profile sample is sequentially subjected to solution treatment, aging treatment, and anodizing treatment; Determine whether the color of the aluminum extrusion profile sample after anodizing treatment is abnormal, select the aluminum extrusion profile samples of different colors for grade classification, and perform the following processing: Selecting one surface of the aluminum extruded profile sample as a reference surface, and removing the oxide film generated on the reference surface after anodizing treatment; performing polishing on the reference surface; Immersing the aluminum extruded profile sample in the test solution for corrosion, and then taking out the aluminum extruded profile sample for cleaning and drying; According to the corrosion degree of the reference surface, the multiple groups of aluminum extruded profile samples are graded and correlated with the previous grades of anode color difference to form multiple reference samples of different grades. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic flow chart of the inspection method of aluminum extruded profiles according to an embodiment of the present application.

[0016] Figure 2 Two schematic photographs of aluminum extruded profiles after being corroded by the second test solution.

[0017] Figure 3 Two schematic photographs of aluminum extruded profiles after being corroded by the first test solution.

[0018] Figure 4 These are microscope magnified images of three different grades of aluminum extruded profiles according to the embodiments of this application.

[0019] Figure 5 A schematic flow chart of a critical reference sample of aluminum extruded profiles is provided for the embodiments of the present application. DETAILED DESCRIPTION

[0020] In order to more clearly understand the purpose, features and advantages of the present application, the present application is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth to facilitate a full understanding of the present application, and the embodiments described are only a part of the embodiments of the present application, rather than all of the embodiments.

[0021] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, it should be noted that the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art in the technical field of the present application. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0023] Some embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0024] Solution treatment is a heat treatment process, the main purpose of which is to evenly dissolve the solute elements in the alloy into the base metal to form a solid solution. In this process, the solubility of the solute elements in the base metal is increased by heating the alloy, thereby achieving a uniform distribution effect. Solution treatment helps to improve the strength and toughness of the alloy, laying the foundation for subsequent processing and aging treatment.

[0025] Aging treatment is a heat treatment process after solution treatment. Its purpose is to adjust the alloy's aging temperature, aging time, temperature system and other parameters to precipitate, precipitate or transform the phase in the alloy, thereby improving the alloy's performance. Aging treatment can significantly improve the alloy's mechanical properties such as hardness, tensile strength, yield strength and elongation, and can also improve the alloy's corrosion resistance.

[0026] This application provides a method for testing aluminum extrusion profiles after solution treatment and aging treatment, which can be used to predict the appearance of discoloration in the aluminum extrusion profiles after anodizing. Figure 1 , Figure 1 The following is a flow chart of a method for inspecting aluminum extruded profiles provided in an embodiment of the present application. Figure 1 As shown, the inspection method for aluminum extruded profiles provided in the embodiment of the present application includes the following steps S1 to S4.

[0027] Step S1, providing aluminum extruded profiles.

[0028] The aluminum extrusion profile has undergone heat treatment such as solid solution and aging, and has not yet been anodized.

[0029] Step S2: polishing the test surface of the aluminum extruded profile.

[0030] Polishing the aluminum extrusion profile includes: polishing the test surface of the aluminum extrusion profile with sandpaper. The purpose of step S2 is to obtain a clean and smooth test surface, because the dirt, impurities and uneven defects remaining on the test surface of the aluminum extrusion profile will interfere with the subsequent inspection and judgment, and affect the judgment result of the subsequent observation of the test surface, so the test surface must be polished into a smooth and impurity-free surface.

[0031] In some embodiments, since the thickness of the aluminum extrusion profile will be reduced to a certain extent during the polishing process, a certain amount of excess thickness is usually reserved on the side where the test surface is located for consumption during the polishing process. For example, the excess thickness may be 0.05 mm.

[0032] In some embodiments, the sandpaper polishing includes: using 800-grit sandpaper to perform rough polishing on the test surface of the aluminum extrusion profile, using 1200-grit sandpaper to perform medium polishing on the test surface of the aluminum extrusion profile, and using 2000-grit sandpaper to perform fine polishing on the test surface of the aluminum extrusion profile. A good polishing effect can be obtained by sequentially polishing with three sandpapers of different coarseness and fineness.

[0033] The coarseness of sandpaper is determined by the number of grains per unit area. Specifically, the number of sandpaper represents the number of grains per square centimeter. For example, 800-grit sandpaper contains 800 grains of sand per square centimeter, while 2000-grit sandpaper has 2000 grains of sand per square centimeter. Therefore, the larger the number, the finer the sandpaper. In practical applications, 800-grit sandpaper is relatively coarse and suitable for some occasions that require greater grinding; while 2000-grit sandpaper is finer and suitable for occasions that require fine grinding.

[0034] In some embodiments, after polishing with sandpaper, polishing the aluminum extruded profile further includes: polishing the test surface of the aluminum extruded profile with aluminum polishing paste. The polishing paste can further polish the test surface of the aluminum extruded profile to obtain a bright effect.

[0035] In some embodiments, the components of the aluminum polishing paste include an abrasive, a polishing agent, a brightener, and a solvent. The abrasive can be selected from at least one of aluminum oxide, silicon dioxide, and titanium dioxide. The polishing agent can be oleic acid. The brightener can be silicone. The solvent can be mineral oil.

[0036] Step S3, immersing the aluminum extruded profile in a test solution for corrosion.

[0037] Since impurities such as polishing paste may remain on the test surface after polishing, the inspection method also includes wiping the test surface of the polished aluminum extrusion profile with anhydrous alcohol to remove impurities and drying it before immersing the aluminum extrusion profile in the test solution.

[0038] The function of step S3 is to corrode the aluminum extruded profile. If the product has passed the heat treatment such as solid solution and aging and has good corrosion resistance, then step S3 will cause less or basically no corrosion to it. If the product has failed the heat treatment such as solid solution and aging, for example, during the solid solution and aging treatment, the MgZn2 phase in the aluminum material precipitates abnormally coarsely in the aluminum matrix, resulting in poor corrosion resistance of the aluminum extruded profile, then step S3 will cause more corrosion to it.

[0039] The test solution may be a first test solution or a second test solution. In the embodiment of the present application, the first test solution is an acidic solution, and the second test solution is an alkaline solution. In some embodiments, the first test solution is an aqueous solution including phosphoric acid, wherein the mass percentage concentration of the phosphoric acid is 80%-90%. When the first test solution is used, the aluminum extruded profile is immersed in the first test solution for corrosion, and the temperature of the first test solution is maintained at 75-85° C., and the immersion time is 50-70 seconds. The second test solution is an aqueous solution including sodium hydroxide, wherein the mass percentage concentration of the sodium hydroxide is 1%-2%. When the second test solution is used, the aluminum extruded profile is immersed in the second test solution for corrosion, and the temperature of the second test solution is maintained at 70-80°C, and the immersion time is 160-200 seconds.

[0040] After the aluminum extrusion profile is immersed in the test solution for a preset time, the aluminum extrusion profile is taken out of the test solution, and the aluminum extrusion profile is washed and dried. In some embodiments, the washing can be done with deionized water. The drying can be done with a clean dust-free cloth, and then the aluminum extrusion profile is allowed to dry naturally.

[0041] Step S4, judging whether the aluminum extruded profile is abnormal according to the corrosion degree of the test surface of the aluminum extruded profile, if the corrosion degree reaches or exceeds the preset corrosion degree, the aluminum extruded profile is judged to be abnormal, otherwise, the aluminum extruded profile is judged to be qualified.

[0042] In some embodiments, determining whether the aluminum extruded profile is abnormal includes: providing a critical reference sample of the aluminum extruded profile, comparing a test surface of the aluminum extruded profile with a reference surface of the reference sample, and determining whether the aluminum extruded profile is abnormal.

[0043] In order to ensure the accuracy of the judgment, a reference sample that has undergone the same polishing and corrosion treatments as mentioned above is usually provided. By comparing it with the reference sample, it is determined whether the degree of corrosion exceeds that of the reference sample.

[0044] For multiple aluminum extruded profile workpieces from the same batch or multiple aluminum extruded profile workpieces from different batches, the final corrosion resistance of the aluminum extruded profiles may be different, and the products are usually graded. For example, the products are divided into Class A, Class B, Class C, and Class D, etc., where the corrosion resistance of Class A, Class B, Class C, and Class D decreases in sequence. In some embodiments, products of Class C and above are considered qualified products, and products below Class C are considered unqualified products. In this case, the C-class product can be used as a reference sample for this application. In some embodiments, B and above are considered qualified products, and products below Class B are considered unqualified products. In this case, the B-class product can be used as a reference sample for this application. Which specific level is considered qualified can be adjusted and set according to the final application scenario and requirements of the product.

[0045] In an ideal state, after the corrosion treatment in step S3, the aluminum extruded profile is completely uncorroded, and the test surface still maintains a bright effect. In this state, the test surface has a high reflectivity to light. However, after the corrosion treatment in step S3, the actual aluminum extruded profile workpiece may have more or less dotted corrosion pits on the test surface. The size of the corrosion pits is small and cannot be seen directly by the naked eye. The presence of corrosion pits causes light to be diffusely reflected on the test surface, so when the test surface is observed with the naked eye, a matte effect similar to fog can be seen.

[0046] In some embodiments, for aluminum extrusion profiles with obvious corrosion, the degree of matte effect of the test surface can be compared with the degree of matte effect of the reference sample by visual observation after taking a photo or directly visual observation, and then a direct judgment can be made. If the matte degree of the test surface of the aluminum extrusion profile is greater than or equal to the matte degree of the reference surface, the aluminum extrusion profile is judged to be abnormal.

[0047] Figure 2 Shown are photographs of the test surfaces of the aluminum extruded profiles after being corroded by the second solution, one of which is qualified and the other is unqualified. It can be seen that the matte degree of the surface of the unqualified aluminum extruded profile is significantly greater than the matte degree of the surface of the qualified aluminum extruded profile.

[0048] Figure 3 Shown are photographs of the test surfaces of the aluminum extruded profiles after being corroded by the first solution, one of which is qualified and the other is unqualified. It can be seen that the matte degree of the surface of the unqualified aluminum extruded profile is significantly greater than the matte degree of the surface of the qualified aluminum extruded profile.

[0049] For aluminum extruded profiles whose matteness cannot be directly judged by the naked eye, a microscope can be used to magnify and compare them, thereby making an accurate judgment.

[0050] Figure 4Shown are microscope magnified images of the test surfaces corresponding to three different grades of aluminum extruded profiles, and the three images have the same area and magnification. In the magnified image of the A-grade aluminum extruded profile, it can be seen that only two or three black pit-like corrosion points appear sporadically in the image. In the magnified image of the B-grade aluminum extruded profile, it can be seen that the number of black pit-like corrosion points in the image is significantly more than the number of corrosion points in the A-grade aluminum extruded profile. In the magnified image of the C-grade aluminum extruded profile, it can be seen that the number of black pit-like corrosion points in the image is significantly more than the number of corrosion points in the B-grade aluminum extruded profile. In one embodiment, for example, B-grade and above are defined as qualified products, and C-grade and below are defined as unqualified products. In this case, the C-grade product can be used as a reference sample.

[0051] Therefore, when making actual judgments, you can use a microscope to magnify the image and make effective judgments.

[0052] In some embodiments, a microscope is used to capture a partial magnified image of the test surface of the aluminum extruded profile and a partial magnified image of the reference surface of the reference sample; The density of the corrosion black spots in the local enlarged image is observed. If the density of the corrosion black spots on the test surface is greater than or equal to the density of the corrosion black spots on the reference surface, the aluminum extruded profile is judged to be abnormal.

[0053] The density of corrosion black spots refers to the number of corrosion black spots per unit area. The greater the density of corrosion black spots, the greater the degree of corrosion of the aluminum extruded profile by the test solution, and the worse the corrosion resistance of the aluminum extruded profile; the smaller the density of corrosion black spots, the smaller the degree of corrosion of the aluminum extruded profile by the test solution, and the better the corrosion resistance of the aluminum extruded profile.

[0054] In the present application, the reference sample of the aluminum extruded profile is obtained by the reverse calculation method, and it is necessary to ensure that the reference sample and the aluminum extruded profile workpiece undergo exactly the same polishing treatment and exactly the same corrosion treatment.

[0055] In some embodiments, in combination with Figure 5 , providing a critical reference sample of aluminum extruded profiles includes the following steps S51 to S56.

[0056] S51. Provide an aluminum extruded profile sample, which has undergone solution treatment, aging treatment, and anodizing treatment in sequence.

[0057] In some embodiments, the aluminum extruded profile sample is subjected to milling, sanding, and sandblasting in sequence after solution treatment and aging treatment and before anodizing treatment.

[0058] S52. Determine whether the color of the aluminum extruded profile sample after anodizing treatment is abnormal, select aluminum extruded profile samples of different colors for grade classification, and perform the following processing.

[0059] S53. Select one surface of the aluminum extruded profile sample as a reference surface, and remove the oxide film generated on the reference surface after anodizing.

[0060] Since it is necessary to ensure that the test surface of the reference sample and the aluminum extrusion profile to be compared have the same condition, the oxide film on the reference surface needs to be removed. The oxide film can be removed by mechanical polishing, but is not limited to this.

[0061] S54, polishing the reference surface.

[0062] The reference surface of the reference sample and the test surface of the aluminum extrusion profile to be compared therewith undergo exactly the same polishing treatment, for details, see the above-mentioned polishing treatment.

[0063] S55, and immersing the aluminum extruded profile sample in the test solution for corrosion, and then taking out the aluminum extruded profile sample for cleaning and drying.

[0064] Similarly, the reference surface of the reference sample and the test surface of the aluminum extrusion profile to be compared therewith undergo exactly the same corrosion treatment, and the specific details can be referred to the above-mentioned corrosion treatment.

[0065] S56. According to the corrosion degree of the reference surface, multiple groups of aluminum extrusion samples are graded and correlated with the grades of anode color in S52 to form multiple reference samples of different grades. According to the quality requirements of the actual product, the corresponding grade of reference samples can be selected for comparison with the test product.

[0066] The traditional quality inspection method for aluminum extruded profiles with discoloration after anodizing: After the aluminum extruded profiles are anodized, an appearance inspection is performed to determine whether there are discoloration defects caused by abnormal heat treatment. The cycle takes 15 days and the cost per piece is about 200 yuan. In the present application, the quality inspection of aluminum extruded profiles: by polishing the aluminum extruded profiles that have not yet been anodized and immersing them in the test solution, by observing the test surface and comparing it with the reference sample, the risk of discoloration after anodizing the product can be quickly screened out. The cycle is 1 day and the cost is about 20 yuan per piece. It can be seen that the inspection method for aluminum extruded profiles of the present application can effectively shorten the inspection cycle and reduce production costs.

[0067] The inspection method of aluminum extrusion profiles in the present application can be used to predict in advance whether the workpiece formed by the aluminum extrusion profile will have different colors after anodizing. It only needs to polish and corrode the aluminum extrusion profile, and then compare it with the reference sample to determine whether the aluminum extrusion profile is qualified. Therefore, the inspection method effectively avoids the anodizing treatment of products that fail the heat treatment (solid solution and aging treatment), thus effectively avoiding production waste, shortening the product production cycle and reducing production costs.

[0068] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. A method for inspecting aluminum extruded profiles, for predicting in advance whether the aluminum extruded profiles will have different colors after anodizing, characterized in that: include: Provide aluminum extrusion profiles; Polishing the test surface of the aluminum extruded profile; Immersing the aluminum extruded profile in a test solution for corrosion, wherein the test solution is a first test solution or a second test solution, wherein the first test solution includes an aqueous solution of phosphoric acid, wherein the mass percentage concentration of the phosphoric acid is 80%-90%, and the second test solution includes an aqueous solution of sodium hydroxide, wherein the mass percentage concentration of the sodium hydroxide is 1%-2%; and Whether the aluminum extruded profile is abnormal is judged according to the corrosion degree of the test surface of the aluminum extruded profile. If the corrosion degree reaches or exceeds the preset corrosion degree, the aluminum extruded profile is judged to be abnormal. Otherwise, the aluminum extruded profile is judged to be qualified.

2. The inspection method for aluminum extrusion profiles according to claim 1, characterized in that: The polishing of the test surface of the aluminum extruded profile includes: polishing the test surface of the aluminum extruded profile with sandpaper.

3. The inspection method for aluminum extrusion profiles according to claim 2, characterized in that: The test surface of the aluminum extrusion profile polished by sandpaper includes: The test surface of the aluminum extruded profile was coarsely polished using 800-mesh sandpaper, medium-polished using 1200-mesh sandpaper, and fine-polished using 2000-mesh sandpaper.

4. The method for inspecting aluminum extruded profiles according to claim 2, characterized in that: The method of polishing the test surface of the aluminum extruded profile with sandpaper also includes: polishing the test surface of the aluminum extruded profile with aluminum polishing paste after polishing with sandpaper.

5. The method for inspecting aluminum extruded profiles according to claim 1, characterized in that: Before immersing the aluminum extrusion profile in the test solution, the inspection method further comprises wiping the polished test surface of the aluminum extrusion profile with anhydrous alcohol and drying it; After immersing the aluminum extruded profile in the test solution, the inspection method further comprises: taking the aluminum extruded profile out of the test solution, and washing and drying the aluminum extruded profile.

6. The inspection method for aluminum extrusion profiles according to claim 1, characterized in that: The step of immersing the aluminum extruded profile in the test solution for corrosion comprises: When the first test solution is used, the temperature of the first test solution is maintained at 75-85° C. and the immersion time is 50-70 seconds; When the second test solution is used, the temperature of the second test solution is maintained at 70-80° C., and the immersion time is 160-200 seconds.

7. The inspection method for aluminum extrusion profiles according to claim 1, characterized in that: The determining whether the aluminum extruded profile is abnormal includes: providing a critical reference sample of the aluminum extruded profile, comparing the test surface of the aluminum extruded profile with the reference surface of the reference sample, and determining whether the aluminum extruded profile is abnormal.

8. The method for inspecting aluminum extruded profiles according to claim 7, characterized in that: If the matte degree of the test surface of the aluminum extruded profile is greater than or equal to the matte degree of the reference surface, the aluminum extruded profile is judged to be abnormal.

9. The method for inspecting aluminum extruded profiles according to claim 7, characterized in that: Using a microscope to capture a partial magnified image of the test surface of the aluminum extruded profile and a partial magnified image of the reference surface of the reference sample; The density of the corrosion black spots in the local enlarged image is observed. If the density of the corrosion black spots on the test surface is greater than or equal to the density of the corrosion black spots on the reference surface, the aluminum extruded profile is judged to be abnormal.

10. The method for inspecting aluminum extruded profiles according to claim 7, characterized in that: The reference samples providing the critical value of the aluminum extruded profiles include: Providing an aluminum extruded profile sample, wherein the aluminum extruded profile sample is sequentially subjected to solution treatment, aging treatment, and anodizing treatment; Determine whether the color of the aluminum extrusion profile sample after anodizing treatment is abnormal, select the aluminum extrusion profile samples of different colors for grade classification, and perform the following processing: Selecting one surface of the aluminum extruded profile sample as a reference surface, and removing the oxide film generated on the reference surface after anodizing treatment; performing polishing on the reference surface; Immersing the aluminum extruded profile sample in the test solution for corrosion, and then taking out the aluminum extruded profile sample for cleaning and drying; According to the corrosion degree of the reference surface, the multiple groups of aluminum extruded profile samples are divided into grades and correlated with the previous grades of anode color difference to form multiple reference samples of different grades.

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