Metallographic etchant and metallographic etching method for pure titanium and beta titanium alloy

A beta titanium alloy and metallographic corrosion technology is applied in the metallographic etchant and corrosion field of pure titanium and beta titanium alloys, which can solve the problems of difficult to control corrosion time, corrosion pits, plaques, and inability to corrode tissue morphology.

Inactive Publication Date: 2012-12-05
西安赛特新材料科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The metallographic structure of pure titanium and β-titanium alloys is a single-phase structure. During the metallographic corrosion process, the grain boundaries are difficult to corrode clearly, and the corrosion time is difficult to control. If the time is too short, the grain boundaries are difficult to corrode. Corrosion pits and plaques, especially the processed state structure, the grain boundary itself is not isometric, using the traditional one-time corrosion, there will be fuzzy, messy, and curved lines in the grain, and the structure morphology cannot be corroded basically. Abnormalities in these structures Imaging can affect metallographic analysis

Method used

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  • Metallographic etchant and metallographic etching method for pure titanium and beta titanium alloy
  • Metallographic etchant and metallographic etching method for pure titanium and beta titanium alloy
  • Metallographic etchant and metallographic etching method for pure titanium and beta titanium alloy

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Experimental program
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Effect test

Embodiment 1

[0020] Use analytically pure nitric acid, hydrofluoric acid and water as raw materials to prepare an etching solution at a ratio of 10ml:5ml:50ml, soak the ground and polished hot-rolled pure titanium plate metallographic sample in the etching solution for 12 seconds, take out the test solution Immediately rinse the sample with tap water, and then soak it in absolute ethanol at 32°C for 14 minutes; take it out for the second polishing; use analytical pure nitric acid, hydrofluoric acid and water as raw materials to prepare a corrosion solution in a ratio of 10ml: 3ml: 60ml , Soak for 10 seconds, take out the sample and immediately rinse it with tap water, then clean it with absolute ethanol without room temperature, and finally dry it with hot air with a hair dryer. The metallographic structure of the obtained pure titanium plate is shown in Fig. 1(b). Compared with the metallographic structure corroded by the traditional method (Fig. 1(a)), the hot-rolled structure obtained by...

Embodiment 2

[0022] Use analytically pure nitric acid, hydrofluoric acid and water as raw materials to prepare an etching solution at a ratio of 12ml:5ml:55ml, soak the metallographic sample of the annealed pure titanium plate that has been ground and polished in the etching solution for 12 seconds, and take out the sample Immediately rinse with tap water, then soak in absolute ethanol at 38°C for 16 minutes; take it out for second polishing; use analytical pure nitric acid, hydrofluoric acid and water as raw materials to prepare a corrosion solution in a ratio of 10ml: 5ml: 62ml, Soak for 10 seconds, take out the sample and immediately rinse it with tap water, then clean it with absolute ethanol without room temperature, and finally dry it with hot air from a hair dryer. The metallographic structure of the obtained pure titanium plate is shown in Fig. 2(b). Compared with the metallographic structure corroded by the traditional method (Fig. 2(a)), the annealed structure obtained by the meth...

Embodiment 3

[0024] Use analytically pure nitric acid, hydrofluoric acid and water as raw materials to prepare an etching solution at a ratio of 10ml: 3ml: 45ml, soak the ground and polished hot-rolled Ti25Nb25Zr rod metallographic sample in the etching solution for 15 seconds, take out the sample Immediately rinse the sample with tap water, and then soak it in absolute ethanol at 40°C for 16 minutes; take it out for the second polishing; use analytical pure nitric acid, hydrofluoric acid and water as raw materials to prepare a corrosion solution in a ratio of 10ml: 3ml: 50ml , Soak for 12 seconds, take out the sample and immediately rinse it with tap water, then clean it with absolute ethanol without room temperature, and finally dry it with hot air with a hair dryer. The metallographic structure of the obtained hot-rolled Ti25Nb25Zr bar is shown in Figure 3(b). Compared with the metallographic structure corroded by the traditional method (Figure 3(a)), the hot-rolled structure obtained by...

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Abstract

The invention relates to the field of metallographic etching of titanium and titanium alloy and discloses metallographic etchant and a metallographic etching method for pure titanium and beta titanium alloy. The metallographic etchant and the metallographic etching method are mainly used for metallographic etching of the pure titanium and the beta titanium alloy. The etchant consists of 10 to 40 volume parts of nitric acid, 5 to 10 volume parts of hydrofluoric acid, and 30 to 100 volume parts of water. The method comprises the following steps of: soaking a ground and polished metallographic specimen in the etchant for a certain period of time, then placing the metallographic specimen in warm absolute ethanol at the temperature of between 30 and 50 DEG C for a moment, polishing again to ensure that the etching layer is polished completely, and etching the metallographic specimen for the second time by using etchant which is similar to the etchant used in the first-time etching to obtain a single-phase metallographic structure. By the method, processing-state and annealing-state pure titanium and beta titanium alloy bars, wires and plates are subjected to metallographic etching, and the obtained single-phase metallographic structure is clear and complete in crystal boundary, and abnormal etching pits or plaques in a single crystal grain can be avoided.

Description

technical field [0001] The invention relates to the field of metallographic corrosion of titanium and titanium alloys, in particular to metallographic corrosion solutions and corrosion methods for pure titanium and beta titanium alloys. Background technique [0002] The metallographic structure of pure titanium and β-titanium alloys is a single-phase structure. During the metallographic corrosion process, the grain boundaries are difficult to corrode clearly, and the corrosion time is difficult to control. If the time is too short, the grain boundaries are difficult to corrode. Corrosion pits and plaques, especially the processed state structure, the grain boundary itself is not isometric, using the traditional one-time corrosion, there will be fuzzy, messy, and curved lines in the grain, and the structure morphology cannot be corroded basically. Abnormalities in these structures Imaging can affect metallographic analysis. In order to conduct effective metallographic analys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/26G01N1/32
Inventor 樊亚军曹继敏杨华斌罗斌莉赵俊罗乾伟
Owner 西安赛特新材料科技股份有限公司
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