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Metallographic sample preparation and display method for iron-aluminum-silicon layer of aluminum-silicon coated steel plate

A coated steel plate and metallographic sample preparation technology, which is applied in the field of metal coating detection, can solve the problems of brittle coating, difficult sample preparation, and inability to guarantee the integrity of the coating, so as to achieve complete coating and low detection and analysis costs Effect

Pending Publication Date: 2021-11-02
TANGSHAN IRON & STEEL GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the coating of aluminum-coated silicon products is very brittle after hot stamping, the integrity of the coating cannot be guaranteed by the traditional metallographic sample preparation method, and the traditional nitric acid etchant cannot distinguish the phases in the iron-aluminum-silicon layer. XRD method can be used to achieve this purpose, but its cost is high and sample preparation is difficult

Method used

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  • Metallographic sample preparation and display method for iron-aluminum-silicon layer of aluminum-silicon coated steel plate
  • Metallographic sample preparation and display method for iron-aluminum-silicon layer of aluminum-silicon coated steel plate
  • Metallographic sample preparation and display method for iron-aluminum-silicon layer of aluminum-silicon coated steel plate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this example, the aluminum-silicon coated steel plate (1500+AS grade), the metallographic sample preparation and display method of the metallographic structure of the iron-aluminum-silicon layer after hot stamping, including sample preparation, chemical corrosion and microscope observation, the specific process steps are as follows Said:

[0038] (1) Sample preparation:

[0039] Take the aluminum-silicon coated steel plate, scrape and coat a layer of Nippon topcoat with a thickness of about 20 μm on the surface of the steel plate with an RDS20 scraper rod, put it in a box-type drying furnace, keep the furnace temperature at 350 ° C, keep it for 50 seconds, and blow it with cold air after water cooling Dry; Cut a sample of 15mm×15mm by wire cutting, put the sample into the mosaic machine for mosaic;

[0040] Roughly grind the inlaid sample on a grinder until the surface is smooth and the scratches are of the same depth, and then smoothed on 280#, 400#, 600#, 800# met...

Embodiment 2

[0047] Take the aluminum-silicon-coated steel plate, scrape and coat a layer of Nippon topcoat with a thickness of about 35 μm on the surface of the steel plate with an RDS 35 scraper rod, put it in a box-type drying furnace, and dry it at a furnace temperature of 347 ° C, keep it for 52 seconds, and water-cool it. Afterwards, dry it with cold air; cut a sample of 10mm×10mm by wire cutting, and put the sample into the mosaic machine for mosaic;

[0048] Roughly grind the inlaid sample on a grinder until the surface is smooth and the scratches are of the same depth, and then smoothed on 280#, 400#, 600#, 800# metallographic sandpaper in turn, and the smoothing direction is perpendicular to the direction of the previous scratch;

[0049] Use a fine velvet polishing cloth evenly sprayed with 2.5 μm metallographic polishing agent to polish the sample, spray absolute ethanol while polishing, and the surface of the sample is bright without scratches after polishing for 86 seconds;

...

Embodiment 3

[0055] Take the aluminum-silicon coated steel plate, scrape and coat a layer of Nippon topcoat with a thickness of about 50 μm on the surface of the steel plate with an RDS50 scraper rod, put it in a box-type drying furnace, and dry it at a furnace temperature of 352 ° C, keep it warm for 47 seconds, and then water-cool it. Blow dry with cold air; cut a sample of 20mm×20mm by wire cutting, put the sample into the mosaic machine for mosaic;

[0056]Roughly grind the inlaid sample on a grinder until the surface is smooth and the scratches are of the same depth, and then smoothed on 280#, 400#, 600#, 800# metallographic sandpaper in turn, and the smoothing direction is perpendicular to the direction of the previous scratch;

[0057] Use a fine velvet polishing cloth evenly sprayed with 2.5 μm metallographic polishing agent to polish the sample, spray absolute ethanol while polishing, and the surface of the sample is bright without scratches after polishing for 110 seconds;

[005...

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Abstract

The invention discloses a metallographic sample preparation and display method of an iron-aluminum-silicon layer after hot stamping forming of an aluminum-silicon coated steel plate, which comprises the following steps: (1) sample preparation: taking the aluminum-silicon coated steel plate, blade-coating a layer of finish paint on the surface of the steel plate by using an RDS20-50# scraper bar, placing the steel plate in a box-type drying furnace for drying, preserving heat, cooling with water, and then blow-drying with cold air, wherein the thickness of the film is 20-50[mu]m, cutting the sample by using wire cutting, and putting the sample into an embedding machine for embedding; then performing grinding and polishing; (2) chemical corrosion: the sample prepared in the step (1) is sequentially subjected to chemical corrosion in a test solution a and a test solution b, the test solution a is a 0.1% nitric acid methanol solution, and the test solution b is 0.1% nitric acid +0.1% HF aqueous solution; and (3) microscope observation: after chemical corrosion is completed, washing the sample with absolute ethyl alcohol, blow-drying the sample with a blower, and observing the sample under a ZISS metallographic microscope. According to the method provided by the invention, a complete coating structure can be obtained, the morphology and distribution state of each phase in the coating can be clearly displayed in the structure observation process, and the method has the characteristics of low detection and analysis cost, rapidness and simplicity.

Description

technical field [0001] The invention belongs to the technical field of metal coating detection, and in particular relates to a metallographic sample preparation and display method of an iron-aluminum-silicon layer after hot stamping of an aluminum-silicon coated steel plate. Background technique [0002] Due to the good anti-oxidation and anti-corrosion properties of aluminum-silicon-coated steel sheets, the research and development and application of its products are becoming more and more extensive, and the technical requirements for its physical performance testing are also increasing. At present, there are few studies on the changes of coating phases after hot stamping of aluminum-silicon-coated steel sheets, especially on the changes of alloy layers. The microstructure and performance of the coating on the coated steel sheet have changed after hot stamping. With the completion of the hot stamping, there are many quality problems in the coating, such as coating cracking,...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N1/32G01N21/84
CPCG01N1/28G01N1/286G01N1/32G01N21/84G01N2001/2866G01N2001/2873
Inventor 魏焕君邝霜田秀刚何先勇韩鹏冯倩尹芳郭健霍俊梅
Owner TANGSHAN IRON & STEEL GROUP
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