Metallographic corrosive agent for annealed pure titanium and titanium alloy and using method of metallographic corrosive agent

A titanium alloy and etchant technology, applied in the field of metallographic etchant preparation, can solve the problems of excessive corrosion of the sample, difficult corrosion time, corrosion damage of operators and equipment, and achieve uniform surface of the sample and clear and complete outline of grain boundaries. , The effect of convenient and quick metallographic corrosion

Inactive Publication Date: 2018-02-23
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
Among the commonly used corrosion reagent formulas for titanium materials, the first one is oxalic acid corrosion reagent 10-20ml and water 80-90ml. The corrosion needs to be carried out at boiling temperature, and the treatment time is 1-3 minutes. For pure titanium, the corrosion time To be longer; the second is: HF (1 weight part) + HNO 3 (1 part by weight) or HF (1 part by weight)+HNO 3 (1 part by weight)+lactic acid (3 parts by weight), the disadvantage is that it produces harmful yellow smoke to the human body; the third is: HF 1 ~ 3ml, HNO 3 2~6ml and 100ml of water, because nitric acid is highly corrosive, it is very easy to cause strong corrosion damage to operators and equipment; moreover, due to the long corrosion time, it is difficult to accurately control the corrosion time, which often causes excessive corrosion of the sample Or slightly corroded, resulting in blurred metallographic photos, no obvious grain boundaries can be seen

Method used

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  • Metallographic corrosive agent for annealed pure titanium and titanium alloy and using method of metallographic corrosive agent
  • Metallographic corrosive agent for annealed pure titanium and titanium alloy and using method of metallographic corrosive agent
  • Metallographic corrosive agent for annealed pure titanium and titanium alloy and using method of metallographic corrosive agent

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Effect test

Embodiment 1

[0030] This embodiment provides a metallographic etchant for annealed pure titanium TA1 and TC4 titanium alloys. The preparation and use methods are as follows:

[0031] First 60ml of dehydrated alcohol (mass fraction is 98%) is joined in the plastic container, then add analysis pure acetic acid (mass fraction is 99.5%) 30ml, citric acid (mass fraction is 60%) 10ml, the solution is mixed evenly, in At room temperature, use a plastic dropper to absorb a small amount of corrosive agent, and drop it on the surface of the polished pure titanium TA1 precision forged bar metallographic sample surface and the pure titanium TA1 annealed bar sample surface, the erosion time is 15s, 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 and morphology of the obtained pure titanium TA1 precision forged rod are shown in figure 1 , the metallo...

Embodiment 2

[0033] This embodiment provides a metallographic etchant for annealed pure titanium TA1 and TC4 titanium alloys. The preparation and use methods are as follows:

[0034] First 60ml of dehydrated alcohol (mass fraction is 98%) is joined in the plastic container, then add analysis pure acetic acid (mass fraction is 99.5%) 30ml, citric acid (mass fraction is 60%) 10ml, the solution is mixed evenly, in At room temperature, use a plastic dropper to absorb a small amount of corrosive agent, and drop it on the surface of the metallographic sample of the polished TC4 titanium alloy hot-rolled bar and the surface of the metallographic sample of the TC4 titanium alloy annealed sheet. The corrosion time is 10 seconds, and then rinse with 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 TC4 titanium alloy hot-rolled bars are shown in image 3 , the m...

Embodiment 3

[0036] This embodiment provides a metallographic etchant for annealed pure titanium TA1 and TC4 titanium alloys. The preparation and use methods are as follows:

[0037] First 60ml of dehydrated alcohol (mass fraction is 98%) is joined in the plastic container, then add analysis pure acetic acid (mass fraction is 99.5%) 30ml, citric acid (mass fraction is 60%) 10ml, the solution is mixed evenly, in At room temperature, use a plastic dropper to absorb a small amount of corrosive agent, drop it on the surface of the polished TC4 titanium alloy cold-rolled plate metallographic sample, etch for 10 seconds, then rinse the surface with clean water, and then wipe it with a cotton ball dipped in absolute ethanol The surface of the sample was blown dry with a hair dryer. The metallographic structure and morphology of the obtained TC4 titanium alloy cold-rolled sheet are shown in Figure 5 ,Should Figure 5 The microstructure in is a basket structure formed by breaking the original β ...

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Abstract

The invention discloses a metallographic corrosive agent for annealed pure titanium and a titanium alloy. The metallographic corrosive agent is formed by evenly mixing acetic acid, citric acid and absolute ethyl alcohol. The metallographic corrosive agent can conveniently and quickly realize metallographic corrosion of the annealed pure titanium TA1 and the TC4 titanium alloy, the surface of the titanium alloy is uniform and consistent after corrosion, the grain boundary contour of a metallographic structure is clear and complete, and the metallographic structure is conveniently observed and analyzed.

Description

technical field [0001] The invention relates to the field of metallographic etchant preparation, in particular to a metallographic etchant for annealed pure titanium and titanium alloys and a method for using the same. 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 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. Among the commonly used corrosion reagent formulas for titanium materials, the first one is oxalic acid cor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/26G01N1/32
CPCC23F1/26G01N1/32
Inventor 陈飞张玉林左佑于佩航
Owner BEIJING INSTITUTE OF PETROCHEMICAL TECHNOLOGY
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