Metallographic phase corrosive of pure titanium TA1 and TC4 titanium alloy

A technology of etchant and titanium alloy, applied in the preparation of test samples, etc., can solve the problems of long processing time, harmful operators, inconvenient preparation of metallographic etchant and corrosion method, etc., to achieve clear and complete grain boundary outline and uniform surface Effect

Inactive Publication Date: 2014-09-10
BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Titanium and titanium alloys have strong corrosion resistance, which brings inconvenience to the preparation of metallographic etchant and corrosion method
The commonly used corrosion reagent formulations for titanium materials are: oxalic acid corrosion reagent 10-20ml, water 80-90ml, corrosion needs to be carried out at boiling temperature, and the treatment time is 1-3 minutes, and the corrosion time for pure titanium is longer; HF(1 part)+HNO 3 (1 part) or HF (1 part)+HNO 3 (1 part) + lactic acid (3 parts), the disadvantage is that it will emit yellow smoke; HF1 ~ 3ml, HNO 3 2~6ml, water 100ml, the corrosion time also needs 1~2min; there is also acetone added to the corrosion solution, long-term use is harmful to the operator

Method used

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  • Metallographic phase corrosive of pure titanium TA1 and TC4 titanium alloy
  • Metallographic phase corrosive of pure titanium TA1 and TC4 titanium alloy
  • Metallographic phase corrosive of pure titanium TA1 and TC4 titanium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0021] First add 10ml of water into the plastic container, then add 8ml of hydrofluoric acid (mass concentration is 40%), and 8ml of acetic acid (mass concentration is 99.5%) in turn, wherein, hydrofluoric acid can adopt analytically pure hydrofluoric acid, and acetic acid can be Analytical pure acetic acid was used, and the solutions were mixed uniformly to prepare the metallographic etchant of this embodiment. The method of using the metallographic etchant is as follows: At room temperature, use a plastic dropper to absorb a small amount of etchant, and drop it on the surface of the polished pure titanium TA1 precision forged bar metallographic sample. The corrosion time is 5-8s, and then rinse with clean water. Then use a cotton ball dipped in absolute ethanol to wipe the surface of the sample, and dry the surface with a hair dryer. The metallographic structure and morphology of the obtained pure titanium TA1 precision forged rod are shown in figure 1 , the microstructure ...

Embodiment 2

[0023] First add 10ml of water into the plastic container, then add 6ml of hydrofluoric acid (mass concentration is 40%) and 6ml of acetic acid (mass concentration is 99.5%) in turn. Analytical pure acetic acid was used, and the solutions were mixed uniformly to prepare the metallographic etchant of this embodiment. The method of using the metallographic etchant is as follows: at room temperature, use a plastic dropper to absorb a small amount of etchant, and drop it on the surface of the metallographic sample of the polished pure titanium TA1 annealed plate. The erosion time is 8-10s, and then rinse the surface with clean water. Then use a cotton ball dipped in absolute ethanol to wipe the surface of the sample, and dry the surface with a hair dryer. The metallographic structure and morphology of the obtained pure titanium TA1 annealed sheet are shown in figure 2 , the microstructure in this figure is equiaxed α + a small amount of intergranular β, and the grain boundary ou...

Embodiment 3

[0025] First add 15ml of water into the plastic container, then add 8ml of hydrofluoric acid (mass concentration is 40%), 6ml of acetic acid (mass concentration is 99.5%), wherein, hydrofluoric acid can adopt analytically pure hydrofluoric acid, acetic acid can be Analytical pure acetic acid was used, and the solutions were mixed uniformly to prepare the metallographic etchant of this embodiment. The method of using the metallographic etchant is as follows: at room temperature, use a plastic dropper to absorb a small amount of etchant, drop it on the surface of the polished pure titanium TA1 annealed bar metallographic sample, etch for 8-10s, and then rinse the surface with clean water , and then use a cotton ball dipped in absolute ethanol to wipe the surface of the sample, and dry the surface with a hair dryer. The metallographic structure of the obtained pure titanium TA1 annealed rod is shown in image 3 , the microstructure in this figure is a single phase axis α, and th...

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Abstract

The invention discloses a metallographic phase corrosive of pure titanium TA1 and TC4 titanium alloy, mainly aiming at metallographic phase corrosion on pure titanium TA1 and TC4 titanium alloy. The corrosive is prepared from the following components in parts by volume: 5-10 parts of hydrofluoric acid, 5-10 parts of acetic acid and 10-40 parts of water. When the corrosive is used, a sample is cut and is subjected to embedding, grinding and polishing treatment, the prepared corrosive is dropped onto the surface of the treated sample, and after certain time, the surface is washed in clean water, subsequently wrapped by using cotton balls with absolute ethyl alcohol, and is blown to dry. By adopting the metallographic phase corrosive disclosed by the invention, metallographic phase corrosion on pure titanium TA1 and TC4 titanium alloy plates and bars in a machining state and an annealing state can be conveniently and rapidly achieved, the surface of the corroded sample is uniform and accordant, and obtained single-phase or double-phase structure is clear and complete in crystal boundary outline.

Description

technical field [0001] The invention relates to the field of metallographic corrosion of titanium and titanium alloys, in particular to a metallographic etchant for pure titanium TA1 and TC4 titanium alloys. Background technique [0002] The composition, processing and heat treatment of titanium and titanium alloys will result in different metallographic structures. The internal structure of titanium materials has a great influence on its performance, and the performance of different structures will also be different. In order to obtain the required properties of titanium and titanium alloys To understand the composition and morphology of the material, it is necessary to observe the metallographic structure. [0003] Titanium and titanium alloys have strong corrosion resistance, which brings inconvenience to the preparation of metallographic etchant and corrosion method. The commonly used corrosion reagent formulations for titanium materials are: oxalic acid corrosion reage...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/26G01N1/32
Inventor 陈飞张玉林赵云
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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