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Electrolytic extraction and determination method for nonmetallic inclusions in steel

A non-metallic inclusion and determination method technology, applied in the field of metal electrochemistry, can solve the problems of many side reactions, complex formula, unsuitable for long-term use, etc., to achieve simplified extraction and separation process, clear electrolytic reaction, non-toxic and environmentally friendly formula Effect

Active Publication Date: 2017-05-10
JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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Problems solved by technology

[0003] The main disadvantages of the traditional methods of electrolytic extraction and observation of non-metallic inclusions in steel are: 1. Use strong acid or strong alkaline solution as electrolyte, which will damage inclusions during electrolysis; 2. Use organic reagents as electrolyte , the formula is complex and volatile, highly toxic, many side reactions, and low utilization rate; 3. The electrolysis device is too simple and not suitable for long-term use, and the requirements for the size of the sample are strict; 4. The amount of impurities (carbides) after electrolysis Large, difficult to completely remove, increasing the difficulty of detection; 5. Chemical methods are used to separate the inclusions in the subsequent extraction process, causing secondary damage to the inclusions or bringing in additional impurities; 6. The filtered inclusions have poor conductivity and cannot be directly Observed under the scanning electron microscope

Method used

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  • Electrolytic extraction and determination method for nonmetallic inclusions in steel
  • Electrolytic extraction and determination method for nonmetallic inclusions in steel
  • Electrolytic extraction and determination method for nonmetallic inclusions in steel

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Embodiment Construction

[0039] Below in conjunction with embodiment the present invention is described in further detail.

[0040] The electrolytic extraction and determination method of non-metallic inclusions in steel of the present invention, the process steps are as follows:

[0041] 1. Preparation of electrolyte

[0042] To prepare an inorganic electrolytic solution, take 1000mL of deionized water, 50g of potassium chloride, and 10g of citric acid monohydrate, mix and stir until completely dissolved, filter and place in a clean reagent bottle.

[0043] 2. Preparation of semi-permeable membrane

[0044] Dissolve 45g of cellulose acetate in 500mL of acetone, mix well and use the capsule cup and capsule ring as a mold to prepare a semi-permeable membrane cup.

[0045] 3. Preparation of samples

[0046] Take the sample to be electrolyzed and heat it to 840°C for solid solution strengthening treatment, then use sandpaper to remove the surface oxide skin and ultrasonically clean it for 5 minutes be...

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Abstract

The invention relates to an electrolytic extraction and determination method for nonmetallic inclusions in steel, and belongs to the field of physical research methods of metal. Aiming at the defects of an existing electrolytic method for observing the nonmetallic inclusions in the steel, and by improvement and innovation from the aspects such as specimen preparation, electrolyte, an electrolyzer and an extraction method, the invention provides a method, comprising the steps of for dissolving a specimen in the specially-made electrolyzer by adopting novel inorganic electrolyte with a simple formula, carrying out filtering, magnetic separation and sampling, and then directly observing the nonmetallic inclusions in the steel on filter paper; the method has the advantages of accurate determination and wide application range.

Description

technical field [0001] The invention relates to a method for electrolytic extraction and determination of non-metallic inclusions in steel. It belongs to the technical field of metal electrochemistry. Background technique [0002] It is well known that the quality of steel depends to some extent on the quantity, shape and size distribution of inclusions in steel. Generally, inclusions will reduce the mechanical properties and corrosion fatigue limit of steel, and inclusions of different shapes, sizes and compositions have different effects on steel. Therefore, in order to comprehensively study the influence of inclusions on the properties of steel, it is necessary to extract the inclusions from the steel without damage, and then observe their morphology, composition and size distribution through scanning electron microscopy. [0003] The main disadvantages of the traditional methods of electrolytic extraction and observation of non-metallic inclusions in steel are: 1. Use ...

Claims

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Application Information

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IPC IPC(8): G01N23/22G01N1/28G01N1/32G01N1/34
CPCG01N1/28G01N1/32G01N1/34G01N23/22G01N23/2202
Inventor 张欣钱刚阮小江许晓红白云翁韶华周阳
Owner JIANGYIN XINGCHENG SPECIAL STEEL WORKS CO LTD
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