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Method for measuring surface layer oxide film thickness of galvanized steel plate

A measurement method and oxide film technology, applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve problems such as difficulty in ensuring the accuracy of film thickness measurement

Active Publication Date: 2008-02-27
JFE STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, for example, when there are unevenness caused by temper rolling and fine unevenness caused by alloying reaction on the base plated steel sheet, such as alloyed hot-dip galvanized steel sheet, it is difficult to ensure the measurement accuracy of the film thickness.
[0016] As mentioned above, there is no technology that can accurately measure the thickness of the ultra-thin oxide film formed on the surface layer of hot-dip galvanized steel sheets at a minimum speed that does not delay shipments.

Method used

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  • Method for measuring surface layer oxide film thickness of galvanized steel plate
  • Method for measuring surface layer oxide film thickness of galvanized steel plate
  • Method for measuring surface layer oxide film thickness of galvanized steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] After tempering and rolling an alloyed hot-dip galvanized steel sheet with a thickness of 0.8mm, it was immersed in an acidic sulfuric acid aqueous solution containing 20 g / l of sodium acetate at a pH of 2.0 and a liquid temperature of 50°C for 1 second, and then left to stand. After a predetermined period of time, they were washed and dried to prepare 40 test materials in which zinc-based oxides (including hydroxides) were formed on the surface of the plating layer. The inner and outer surfaces of the test materials were used as oxide films. Determination of thickness. At this time, the leaving time was changed in the range of 2 to 60 seconds to adjust the thickness of the oxide film formed on the flat portion of the test material. After punching the test material to a diameter of 12mm, it was ultrasonically cleaned with toluene for 2 minutes, and then ultrasonically cleaned with ethanol for 1 minute, and then dried with hot air and fixed to the sample holder of EPMA on.

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Embodiment 2

[0060] After cutting and processing various hot-dip galvanized steel sheets with a thickness in the range of 0.8-1.2mm after tempering and rolling by electric discharge matting rolls into 40mm squares, they are ultrasonically cleaned with toluene for 2 minutes, and then with ethanol Ultrasonic cleaning was carried out for 1 minute, and then it was dried with hot air and used as a test material. The thickness of the oxide film on the surface of these hot-dip galvanized steel sheets is randomly formed in a storage environment or the like, so it does not cover the entire surface uniformly. In this case, the method of measuring the average oxide film thickness by surface analysis is effective.

[0061]EPMA uses the ERA-8600MX produced by Japan Electronics. The acceleration voltage during the measurement was set to 3kY, the beam current was 120nA, the beam diameter was 100μm, and the analytical crystal was LDE1. Under the conditions of 200 points×200 points at a 100μm pitch, the 20mm s...

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Abstract

An object of the present invention is to provide a technology capable of rapidly and accurately measuring the thickness of an oxide film having a thickness of 10 nm to 100 nm formed on the surface layer of a galvanized steel sheet. Furthermore, the main purpose is to evaluate the press formability of a plated steel sheet having the oxide film based on the measured oxide film thickness. A method for measuring the film thickness of an oxide film formed on the surface of a galvanized steel sheet, characterized in that, using an electron probe microanalyzer or a scanning electron microscope with a wavelength-dispersive X-ray detector, the method is applied to the galvanized steel sheet The surface is irradiated with electron rays accelerated to 3-6kV, and the intensity of Kα rays of oxygen generated by the detector and the wave height analyzer in the subsequent stage is measured to eliminate the influence of secondary rays of zinc L rays.

Description

Technical field [0001] The present invention relates to a technique for rapidly measuring the thickness of an oxide film formed on the surface layer of a galvanized steel sheet with a thickness of 10 nm to 100 nm. Background technique [0002] In the field of products such as steel, semiconductors, and displays, sometimes surface coatings with a thickness of tens to hundreds of nanometers become a factor that determines product characteristics. In the field of steel products, sometimes a surface layer film with a thickness of tens to hundreds of nm becomes a factor that determines the stamping characteristics of the product. In steel sheets used in automobiles and home appliances, zinc-based plating has been frequently applied from the viewpoint of high corrosion resistance in recent years. When a galvanized steel sheet is press-formed to produce a difficult-to-form part, there is a problem that press cracks of the steel sheet are likely to occur at a location that is difficult t...

Claims

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Application Information

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IPC IPC(8): G01B15/02G01N23/225
CPCG01B15/02G01N23/225
Inventor 野吕寿人名越正泰平章一郎杉本芳春佐藤重臣
Owner JFE STEEL CORP
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