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Method for quantitatively evaluating surface color defects of anodized aluminum alloy

A technology for aluminum alloy surface and color defects, which is applied in the direction of color/spectral characteristic measurement, optical test defects/defects, etc., can solve the problems that the severity of color defects cannot be effectively compared, and the analysis of color defects cannot be quantified, so as to facilitate the production process , high precision, and the effect of improving the quality and stability of aluminum materials

Pending Publication Date: 2022-05-27
中铝河南洛阳铝加工有限公司 +1
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Problems solved by technology

[0004] Compared with the existing reported research work and related literature and patents, the current analysis methods for the color defects of the aluminum alloy surface after anodic oxidation have the following limitations: 1. The analysis of color defects mainly depends on the naked eye of the human body, and individual differences are prone to exist ;2. The analysis of color defects cannot be quantified, and can only be carried out relatively by using the overall qualitative method, and qualitative results such as darker, whiter, lighter, and darker can be obtained; 3. When the aluminum alloy is anodized, there are local defects on the surface When there are multiple color difference points or color uneven points, it is not possible to effectively compare the severity of color defects at different local locations

Method used

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  • Method for quantitatively evaluating surface color defects of anodized aluminum alloy
  • Method for quantitatively evaluating surface color defects of anodized aluminum alloy
  • Method for quantitatively evaluating surface color defects of anodized aluminum alloy

Examples

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Embodiment 1

[0027] Example 1: In this example, a blue 1050 aluminum alloy CTP plate with dark streaks in the middle of the sample to be tested is used as an example, and the method for quantitative evaluation of its color defects is as follows:

[0028] (1) Determine the position of the color defect on the surface of the sample to be tested by naked eye observation;

[0029] (2) Determine the straight line perpendicular to the processing direction of the material including the color defect points;

[0030] (3) Determine the test standard point and comparative analysis point by naked eye observation. The point adjacent to the color defect point is the test standard point, and the other selected points are the comparative analysis point. The defect point and the test standard point are respectively For one, select 7 comparative analysis points, and define them as comparative analysis point 1, comparative analysis point 2... comparative analysis point 7;

[0031] (4) Calculate the Lab value...

Embodiment 2

[0035]Embodiment 2: In this embodiment, the sample to be tested is taken as an example of a silver 1050 aluminum alloy CTP plate with wide white stripes on the surface. According to the method of the present invention, the color defect points, the comparative analysis points and the test standard sample points are determined, and the defect points and There is one test standard point each, and two comparative analysis points are selected, which are respectively defined as comparative analysis point 1 and comparative analysis point 2; the color space coordinate Lab value is calculated by spectrophotometry, and the grating diameter in spectrophotometry is 4 mm; Measure and calculate the object color tristimulus values ​​X, Y, Z, color space coordinates L, a, and b values ​​of the test standard points, color defect points, and contrast analysis points, as well as the color defect points, contrast analysis points, and test standard points. The color difference △E value, the calcula...

Embodiment 3

[0037] Example 3: In this example, the sample to be tested is taken as an example of anodized 5xxx series aluminum alloy yellow 3C parts with a light yellow area, and the color defect point, the comparative analysis point and the test standard sample are determined according to the method of the present invention. There are three adjacent color defect points, namely defect points 1, 2, and 3, one test standard point, and four comparative analysis points, namely comparative analysis points 1, 2, 3, and 4; Calculate the color space coordinate Lab value by spectrophotometry, the grating diameter in spectrophotometry is 4mm; measure and calculate the object color tristimulus values ​​X, Y, Z, color space of the test standard point, color defect point, and contrast analysis point Coordinate L, a, b values ​​and color defect points, the color difference △E value between the comparative analysis point and the test standard sample point, the calculation results are shown in Table 3; ba...

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Abstract

The invention discloses a method for quantitatively evaluating surface color defects of anodized aluminum alloy. The method comprises the following steps: (1) determining color defect points; (2) determining a straight line which contains color defect points and is perpendicular to the material processing direction; (3) determining test standard sample points and contrastive analysis points; (4) calculating color space coordinate L, a and b values of the standard sample point, the color defect point and the contrastive analysis point; (5) calculating a color difference value E among the color defect point, the contrastive analysis point and the standard sample point; (6) the severity of the color defect on the surface of the aluminum alloy subjected to anodic oxidation is preliminarily judged; and (7) whether the color defect affects normal use of the anodized aluminum alloy or not is judged. Quantitative evaluation is carried out on the surface color defects of the aluminum alloy subjected to anodic oxidation by means of color difference calculation, color detection is carried out by means of equipment, data quantification is achieved, precision is higher, influences of human factors are small, product quality judgment is facilitated, the production process improvement is facilitated, and the aluminum product quality and stability are improved.

Description

technical field [0001] The invention belongs to the field of analysis and testing of aluminum and aluminum alloy materials, and in particular relates to a method for quantitatively evaluating color defects on the surface of aluminum alloys after anodic oxidation. Background technique [0002] Aluminum and aluminum alloys have the characteristics of low density, high plasticity, good electrical conductivity, corrosion resistance, and easy recycling. After anodizing, they can be widely used in decoration, corrosion protection, electrical insulation, construction and other fields. According to the role of anodizing, anodizing can be divided into bright anodizing, decorative anodizing, protective anodizing, etc. Among them, bright anodizing refers to anodizing characterized by high specular reflectivity, decorative anodizing refers to anodizing films characterized by uniform appearance and beautiful appearance, and protective anodizing refers to corrosion resistance and wear res...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/25G01N21/88
CPCG01N21/25G01N21/88
Inventor 高崇杨升高文赖爱玲任毅斌刘辉
Owner 中铝河南洛阳铝加工有限公司
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