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Method for measuring thickness of galvanized layer

A measuring method and technology of coating thickness, applied in the field of inspection and testing, can solve the problem of not being able to replace the determination of the adhesion amount of the zinc layer, etc., and achieve the effect of improving the measurement accuracy, the method is simple and easy to operate, and the operation is convenient.

Inactive Publication Date: 2013-12-18
ANGANG STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The copper sulfate test method is to immerse the sample in the copper sulfate solution and etch it several times until the end of the test etching to detect the uniformity and corrosion resistance of the coating, but the copper sulfate test cannot replace the adhesion of the zinc layer. determination

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Used to evaluate the thickness of the zinc layer of the LX100B galvanized sheet with a thickness of 3mm.

[0018] 1. Select a sample of galvanized sheet 10×10mm, after inlaying, grinding and polishing, use ultrasonic cleaning to thoroughly remove the contaminants that may remain on the sample surface during the sample preparation process.

[0019] 2. Place the sample in the coating machine, select a carbon rod with a diameter of 1.8mm, and a spraying time of 4s, to spray carbon on the surface of the sample to increase the conductivity of the mosaic sample without concealing the sample information.

[0020] 3. Observe the sample surface under an optical microscope at 500 times to confirm that the standard sample is free of contamination and other defects.

[0021] 4. The sample is put into the electron probe sample chamber and evacuated. The acceleration voltage is 15V, the beam current is 20nA, and the beam spot size is 1.8μm as the analysis parameters.

[0022] 5. Observe the ba...

Embodiment 2

[0026] Used to evaluate the thickness of the zinc layer of the DX52 galvanized sheet with a thickness of 1.5mm.

[0027] 1. Select a sample of galvanized sheet 10×10mm, after inlaying, grinding, and polishing, use ultrasonic cleaning to completely remove the contaminants that may remain on the sample surface during the sample preparation process.

[0028] 2. Place the sample in the coating machine, select a carbon rod with a diameter of 1.5mm, and a spraying time of 3s, and spray carbon on the surface of the sample to increase the conductivity of the mosaic sample without concealing the sample information.

[0029] 3. Observe the sample surface under an optical microscope at 500 times to confirm that the standard sample is free of contamination and other defects.

[0030] 4. The sample is put into the electron probe sample chamber and evacuated. The acceleration voltage is 15V, the beam current is 15nA, and the beam spot size is 1.5μm as the analysis parameters.

[0031] 5. Observe the ...

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Abstract

The invention provides a method for measuring the thickness of a galvanized layer. A galvanized sheet sample is placed in a coating machine, and a carbon rod is used for spraying the surface of the sample with carbon. The sample is placed in an electronic probe sample chamber which is vacuumized, a backscattered electron image of the sample is observed, the thickness of the galvanized layer takes account for 1 / 2 of the scanned area, the line scanning is adopted from the position far away from the outer layer of the galvanized layer by 1 / 2 of the thickness of the galvanized layer to the position, perpendicular to the galvanized layer, far away from the other layer of the galvanized layer by 1 / 2 of the thickness of the galvanized layer in the direction towards a base body to obtain a component analytic curve, 50% of the maximum strength of the steep side of the measured curve serves as the two boundary points of the galvanized layer, and the thickness of the galvanized layer is measured. Different areas are selected and the average value of a plurality of points is worked out, wherein the average value is the thickness of the galvanized layer. The thickness of the galvanized layer is measured through the component analytic curve of the sample, the boundaries are clear, the error problems caused by the fact that the surface of the sample is rough, the shape of the sample is complex, and the contrast of the sample is not obvious can be effectively solved, and the accuracy of measuring the thickness of the galvanized sheet galvanized layer is improved.

Description

Technical field [0001] The invention belongs to the technical field of inspection and testing, and particularly relates to a method for measuring the thickness of the galvanized layer of a galvanized sheet. Background technique [0002] Plating is one of the main methods to protect ferrous metal materials, and it is the most effective and economical way to protect steel from corrosion. According to statistics, galvanized products account for about 70% of all surface treated steel products. The corrosion resistance of the galvanized layer is mainly determined by the thickness of the galvanized layer, so measuring the thickness is often the main basis for judging the quality of the galvanized layer. [0003] The galvanized layer has different reactions depending on the composition, organization and structure of the surface of the workpiece steel. In addition, the angle and speed at which the workpiece enters and exits the zinc solution during the hot-dip galvanizing process also ha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01B15/02
Inventor 马惠霞严平沅李文竹钟莉莉王晓峰黄磊
Owner ANGANG STEEL CO LTD
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