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Acid etching testing method of macrostructure and defect of steels

A technology of low-magnification structure and inspection method, which is applied in the field of steel low-magnification structure inspection, steel low-magnification structure and defect acid corrosion inspection, and can solve the problems of poor cold acid corrosion ability and hot acid corrosion too deep, etc., to achieve safety High reliability, reduced labor costs, and strong operability

Inactive Publication Date: 2017-04-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Application Information

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Problems solved by technology

[0005] The present invention aims to provide a low-magnification structure and defect acid-etching inspection method of steel, which uses a specific method of combining hot acid and cold acid to corrode the low-magnification structure of multi-defect low-alloy steel, and uses this method to solve the cold acid corrosion of multi-defect samples Poor performance, too deep hot acid corrosion, etc., and can be applied in metal material inspection, failure analysis, etc.

Method used

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  • Acid etching testing method of macrostructure and defect of steels
  • Acid etching testing method of macrostructure and defect of steels

Examples

Experimental program
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Effect test

Embodiment 1

[0031] In this example, a low-magnification sample of 50CrVA with a size of φ13 mm was cut and prepared, and the defect of the sample was generally level 4 loose. Select a 50ml beaker container, prepare 50wt% hydrochloric acid aqueous solution, adjust the solution temperature to 65°C, immerse the prepared sample in the above prepared solution, corrode for 15min, and wipe the surface corrosion with 10wt% sodium bicarbonate solution after taking it out product, followed by drying with alcohol. Grind and polish the corroded sample with 800#, 1000#, 1200#, 2000# sandpaper, leaving traces of surface looseness, and use 5wt% nitric acid alcohol solution to corrode for 30s, and the low-magnification structure morphology is as follows figure 1 shown.

Embodiment 2

[0033] In this example, a low-magnification sample of 30CrMnSiA with a size of φ20 mm was cut and prepared, and the defect of the sample was generally level 4 loose. Select a 50ml beaker container, prepare 50wt% hydrochloric acid aqueous solution, adjust the solution temperature to 65°C, immerse the prepared sample in the above prepared solution, corrode for 15min, and wipe the surface corrosion with 10wt% sodium bicarbonate solution after taking it out product, followed by drying with alcohol. Grind and polish the corroded sample with 800#, 1000#, 1200#, 2000# sandpaper, leaving traces of surface looseness, and use 5wt% nitric acid alcohol solution to corrode for 40 seconds, and the low-magnification structure morphology is as follows figure 2 shown.

[0034] The results of the examples show that the present invention speeds up the corrosion rate and improves the corrosion ability by combining thermal erosion and cold erosion, and can truly reflect the loose defects on the ...

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Abstract

The invention belongs to the field of macrostructure detection, and more specifically relates to an acid etching testing method of macrostructure and defect of steels. The acid etching testing method comprises following steps: 1, processing defects caused by sample cutting are removed, wherein the surface roughness of a processed sample is controlled to be 0.8<mu>m or lower, and no macroscopic processing tract is left; 2, a hydrochloric acid water solution is prepared, and the temperature of the hydrochloric acid water solution is adjusted to 60 to 70 DEG C; 3, the processed sample is immersed into the hydrochloric acid water solution, and then is taken out from the hydrochloric acid water solution, surface etched products are removed via scrubbing with a sodium bicarbonate or sodium thiosulfate solution, and then alcohol drying is carried out; and 4, the sample obtained via hot acid etching is subjected to grinding and polishing with abrasive paper so as to obtain surface loosened traces, etching is carried out with a nitric acid alcohol solution, and then observation and detection are carried out. According to the acid etching testing method, hot etching and cold etching are combined, etching speed is increased, etching performance is improved, true reflection of the sample surface loosened traces is achieved, and relatively ideal macrostructure morphology of materials with many defects can be obtained.

Description

technical field [0001] The invention relates to the field of low-magnification structure detection, in particular to a steel low-magnification structure and defect acid etching inspection method, which is suitable for the low-magnification structure inspection of steel with multiple defects (generally loose or center level greater than or equal to 3 grades). Background technique [0002] The acid etching test method used in the low-magnification microstructure and defect characterization method of steel is one of the macroscopic inspection methods. This method has a large inspection area, convenient operation, simple equipment, and can quickly detect various metallurgical defects in metal materials. Therefore, the acid etching test of steel is an important detection method commonly used in metal materials, material research and failure analysis. [0003] The inspection method usually adopts the standard GB / T 226-2015 "Steel Low-magnification Structure and Defect Acid Etching...

Claims

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Application Information

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IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 高金柱盖秀颖
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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