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Detection of roller coat chromizing membrane evenness by water cooking method

A technology for detecting the uniformity of rolls and rolls, which is applied to the field of detection of the uniformity of roll-coated chrome films on colored aluminum alloy coil coating products. Membrane performance inconsistent and other problems, to achieve the effect of short time

Active Publication Date: 2012-09-26
SOUTHWEST ALUMINUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, how to detect the uniformity of the chromized film in the transverse direction of the strip, and query the relevant information, no detection method has been found. At present, it is guaranteed by the process, such as: by controlling the uniformity of the surface of the coating roller, the ratio of the roller speed, the concentration of the bath solution, and strengthening Management and other aspects to ensure, specifically, Liu Hongjun and others pointed out in "Factors Affecting the Quality of Aluminum Alloy Chromium Films" that strengthening management is beneficial to obtain uniform and fine chromium coatings (Liu Hongjun, Factors Affecting the Quality of Aluminum Alloy Chromization Films. Coating and Electroplating, 2009, 01: 21-37.)
However, the uniformity cannot be judged, and abnormalities occur during the production process, so it is impossible to accurately know the quality of the chromium coating
Therefore, in production, it is often found that the coating film performance is unstable and the strip transverse coating film performance is inconsistent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A kind of boiling method detects the homogeneity of roller coating chromized film, comprises the following steps:

[0019] ① Sampling: Take finished samples from the production line of colored aluminum alloy coils. The samples should be flat, free of oil stains and damages;

[0020] ② Modulation of lye: prepare NaOH solution, the pH value is 7.5, and heat to boiling;

[0021] ③Poaching: put the sample in boiling NaOH solution, boil it for 20 minutes, take it out, rinse it, dry it or dry the water, and then visually observe the surface;

[0022] ④ Judgment of uniformity:

[0023] a. There are no streaks on the surface, the color is uniform, and the chrome film is very uniform;

[0024] b. Sporadic stripes on the surface, uniform color, and relatively uniform chrome film;

[0025] c. Fine stripes on the surface, uniform chrome film;

[0026] d. The surface has thick and many stripes, and the chromium coating is uneven.

Embodiment 2

[0028] A kind of boiling method detects the homogeneity of roller coating chromized film, comprises the following steps:

[0029] ① Sampling: Take finished samples from the production line of colored aluminum alloy coils. The samples should be flat, free of oil stains and damages;

[0030] ②Preparation of lye: prepare NaOH solution, the pH value is 9, and heat to boiling;

[0031] ③Poaching: Put the sample in boiling NaOH solution, boil it for 50 minutes, take it out, rinse it, dry it or dry the water, and then visually observe the surface;

[0032] ④ Judgment of uniformity:

[0033] a. There are no streaks on the surface, the color is uniform, and the chrome film is very uniform;

[0034] b. Sporadic stripes on the surface, uniform color, and relatively uniform chrome film;

[0035] c. Fine stripes on the surface, uniform chrome film;

[0036] d. The surface has thick and many stripes, and the chromium coating is uneven.

Embodiment 3

[0038] A kind of boiling method detects the homogeneity of roller coating chromized film, comprises the following steps:

[0039] ① Sampling: Take finished samples from the production line of colored aluminum alloy coils. The samples should be flat, free of oil stains and damages;

[0040] ② Modulation of lye: prepare NaOH solution, the pH value is 8, and heat to boiling;

[0041] ③Poaching: Put the sample into boiling NaOH solution, boil it for 30 minutes, take it out, rinse it, dry it or dry the water, and then visually observe the surface;

[0042] ④ Judgment of uniformity:

[0043] a. There are no streaks on the surface, the color is uniform, and the chrome film is very uniform;

[0044] b. Sporadic stripes on the surface, uniform color, and relatively uniform chrome film;

[0045] c. Fine stripes on the surface, uniform chrome film;

[0046] d. The surface has thick and many stripes, and the chromium coating is uneven.

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PUM

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Abstract

The invention discloses a method for detecting the uniformity of a roller coating chromizing film by a water boiling method. The method comprises the following steps: (1) sampling: a roller coating chromizing sample is picked up from a colorful aluminum alloy coiled material, and the sample is required to be smooth and free of oil stains and damage; (2) preparing alkali solution, namely an NaOH solution of which the pH value is between 7.5 and 9 is prepared and heated to be boiled; (3) water boiling: the sample is put in the boiling NaOH solution, subjected to water boiling for 30 minutes, taken out, cleaned and air-dried or oven-dried, and then the surface of the sample is visually observed; and (4) making the uniformity judgment. According to the chemical property of the chromizing filmthat the sample can be oxidized and discolored when boiled in water, the uniformity of the thickness of the chromizing film can be judged by the uniformity of color; moreover, the detection method has the advantages of convenience and quickness, short time, and accuracy and reliability.

Description

technical field [0001] The invention relates to a water boiling method for detecting the uniformity of a roll-coated chrome film, in particular to a method for detecting the uniformity of a roll-coated chrome film on a colored aluminum alloy coil coating product. Background technique [0002] Colored aluminum alloy coil coating products must be degreased, washed and rolled with chrome treatment before coating. service life of the coating. The film weight (thickness) and uniformity of the chrome film determine the quality of the chrome film and affect the quality of the final product. The unevenness of the chrome film on the roller coating means that the film thickness in the transverse direction of the strip is uneven, some are more and some are less or some have no chrome film, which will inevitably affect the inconsistency of the transverse coating performance of the strip. [0003] To measure the film weight of the chromium film, the methods currently used include the c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N33/00
Inventor 袁礼军
Owner SOUTHWEST ALUMINUM GRP