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A method for characterizing the surface color concentration of passivation film based on cie Lab system

A technology of color concentration and passivation film, applied in the field of surface science and color measurement, can solve the problems of chromate toxicity, quantitative characterization method, color concentration without the appearance of passive film, etc., to achieve the effect of convenient, fast and easy to understand

Active Publication Date: 2021-04-27
镇江大全金属表面处理有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used chromate passivation can make the surface produce bright iridescent colors, which has good corrosion resistance and decorative properties, but chromate is very toxic and seriously endangers the environment and human health. Based on environmental protection requirements, chromium-free Passivation is a hot spot in current research, and passivation films of various colors have been successfully prepared, including blue-white, green, black and rainbow colors, etc., and the corrosion resistance has also been greatly improved.
[0003] It can be seen that chromium-free passivation can still produce rich colors, but at present, the characterization and evaluation of the appearance and color of the passivation film can only be performed visually. There is no scientific and effective method to characterize the color of the passivation film, let alone The quantitative characterization method of the color density of the passivation film appearance seriously restricts the evaluation and control of the color quality of the passivation film, and restricts the control and optimization of the passivation process

Method used

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  • A method for characterizing the surface color concentration of passivation film based on cie Lab system
  • A method for characterizing the surface color concentration of passivation film based on cie Lab system
  • A method for characterizing the surface color concentration of passivation film based on cie Lab system

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Effect test

Embodiment 1

[0021] Embodiment 1: a kind of verification of the characterization method of the surface color concentration of the passivation film based on CIE Lab system:

[0022] Fix a=-120, b=-120 unchanged, change the value of L, and use the formula of the appearance color concentration of the passivation film Calculate the passivation film appearance color concentration value on the passivation film sample surface of uniform color concentration (see Table 1):

[0023] Table 1

[0024]

[0025] From the data in Table 1, it can be seen that as L gradually decreases, the color gradually becomes darker, and the color concentration gradually increases. When the color concentration value reaches 100, it indicates that the color has reached the deepest level;

[0026] Fix L=50, keep a=40, change the value of b, from -120 to 120, the interval is 20, use the formula of the color concentration of the appearance of the passivation film Calculate the passivation film appearance color conce...

Embodiment 2

[0034] Embodiment 2: a kind of characterization method based on the color density of passivation film surface of CIE Lab system, concrete steps are as follows:

[0035] (1) Pretreatment of passivation film samples: place the color passivation film samples prepared by the same passivation film preparation method at a temperature of 40°C for constant temperature aging treatment for 24 hours, and then use absolute ethanol to wipe the surface to remove the samples. Impurities on the sample surface;

[0036] (2) Set the measurement conditions of the CIE Lab color system: D65 geometrical optics lighting conditions, 10° observation field of view, UV light source is off, SCE measurement mode, where the brightness L is 0 to 100, and the color channel a from green to red is -120~120, the color channel b from blue to yellow is -120~120;

[0037] (3) Step (1) uniformly select n measurement points on the surface of the pretreated passivation film sample, wherein n≥5; randomly select a poi...

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Abstract

The invention discloses a CIE Lab system-based characterization method for the surface color concentration of a passivation film, belonging to the fields of surface science and color measurement. The present invention pretreats the passivation film sample, utilizes the CIE Lab color system to measure the L, a, b values ​​of the surface measurement point of the pretreated passivation film sample, and then calculates the value of the passivation film sample surface measurement point according to the color difference formula Color difference value, if the color difference values ​​of n measuring points are all ≤ 10, then the surface of the passivation film sample has a uniform color concentration, and the color value of the surface of the passivation film sample is calculated; if the color difference value of any measurement point >10, the surface of the passivation film sample is non-uniform color concentration; calculate the passivation film appearance color concentration value of the passivation film sample surface with uniform color concentration, where the color concentration of white is 0, and the color concentration of black is 100.

Description

technical field [0001] The invention relates to a characterization method of the color concentration on the surface of a passivation film based on a CIE Lab system, belonging to the fields of surface science and color measurement. Background technique [0002] In the field of surface engineering, in order to prevent corrosion of the metal substrate and prolong its service life, the surface is usually galvanized, which is the most widely used anti-corrosion method in life and production. However, the galvanized layer is easily corroded in humid air to form white rust, which further corrodes the metal substrate and cannot achieve good corrosion resistance. Therefore, after the galvanizing is completed, it must be passivated. Passivation is to form a dense oxide film layer on the surface of the zinc layer to isolate the zinc layer from the external environment and further protect the metal substrate. It has been verified that the passivated workpiece can greatly extend the co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01J3/46
CPCG01J3/465G01J2003/467
Inventor 范云鹰白明明
Owner 镇江大全金属表面处理有限公司