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CIE Lab system-based passive film surface color concentration representation method

A technology of color concentration and passivation film, which is applied in the field of surface science and color measurement, can solve problems such as chromate toxicity, quantitative characterization methods, harm to the environment and human health, and achieve the effect of convenient, quick and easy-to-understand methods

Active Publication Date: 2019-04-09
镇江大全金属表面处理有限公司
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  • 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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  • CIE Lab system-based passive film surface color concentration representation method
  • CIE Lab system-based passive film surface color concentration representation method
  • CIE Lab system-based passive film surface color concentration representation method

Examples

Experimental program
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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 deepest degree of the color has been reached;

[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 co...

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 passive film surface color concentration representation method, and belongs to the field of surface science and color measurement. According to the method, a passive film sample is pretreated; L, a and b values of measurement points on the surface of the pretreated passive film sample are measured by utilizing a CIE Lab color system; color differencevalues of the measurement points on the surface of the passive film sample are calculated according to a color difference formula; if the color difference values of n measurement points are all smaller than or equal to 10, the surface of the passive film sample has a uniform color concentration and a color value of the surface of the passive film sample is calculated; if the color difference valueof any measurement point is greater than 10, the surface of the passive film sample has a non-uniform color concentration; and a passive film appearance color concentration value of the passive filmsample, the surface of which has the uniform color concentration, is calculated, wherein 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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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