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CN-121992472-A - Corrosive agent for metallographic corrosion of titanium palladium alloy and metallographic corrosion method

CN121992472ACN 121992472 ACN121992472 ACN 121992472ACN-121992472-A

Abstract

The invention provides an aggressive agent for metallographic erosion of a titanium palladium alloy, which comprises the following components of glycerol, methanol, benzenesulfonic acid, oxalic acid and deionized water. The etchant can enable metallographic structure corrosion of the titanium palladium alloy to be easy to control, the process is safer, the metallographic structure easy to observe is easier to obtain, and the preparation and corrosion processes of the etchant are simple and convenient to operate.

Inventors

  • LIU YANGYANG
  • LI WENTING
  • WANG LONGSHAN
  • BAO ENCHENG
  • TANG SEN
  • ZHAO DONGKE
  • ZHANG HONGKE

Assignees

  • 万华化学集团股份有限公司

Dates

Publication Date
20260508
Application Date
20241105

Claims (9)

  1. 1. An aggressive agent for metallographic attack of titanium palladium alloy is prepared from the following raw materials: 10-20 parts of glycerin, 15-25 parts of methanol, 3-5 parts of benzenesulfonic acid, 3-10 parts of oxalic acid and 20-30 parts of deionized water.
  2. 2. The etchant for metallographic attack of titanium-palladium alloy according to claim 1, which is prepared from the following raw materials: 13-18 parts of glycerin, 20-25 parts of methanol, 4-5 parts of benzenesulfonic acid, 8-10 parts of oxalic acid and 20-25 parts of deionized water.
  3. 3. The etchant for metallographic attack of titanium palladium alloy according to claim 1 or 2, which is prepared from the following raw materials: 15 parts of glycerin, 25 parts of methanol, 5 parts of benzenesulfonic acid, 10 parts of oxalic acid and 20 parts of deionized water.
  4. 4. A metallographic etching method of a titanium palladium alloy, comprising the steps of: 1) Sequentially adding deionized water, glycerol and methanol into a container, uniformly stirring, standing, sequentially adding benzenesulfonic acid and oxalic acid, and stirring until the benzenesulfonic acid and oxalic acid are completely dissolved to obtain an aggressive agent; 2) Cleaning a titanium palladium alloy sample by using deionized water and ethanol, removing surface attachments, airing, polishing by using sand paper, and mechanically polishing until the surface is smooth to obtain the titanium palladium alloy sample; 3) Placing the aggressive agent prepared in the step 1) into a container, selecting an inert material containing platinum, gold, lead or carbon as a cathode, and placing the titanium palladium alloy sample obtained in the step 2) opposite to the anode at a spacing distance of 2-4cm, connecting the cathode and the anode to a direct current power supply, introducing voltage of 5-15V, and electrolyzing for 20-30s; 4) Taking out the sample, cleaning with deionized water, cleaning with ethanol, and air drying to complete metallographic erosion.
  5. 5. The metallographic etching method of a titanium-palladium alloy according to claim 4, wherein in step 1), The preparation of the aggressive agent is carried out at room temperature; Adding deionized water, glycerol and methanol into a container in turn, stirring uniformly, standing for 10-20min, adding benzenesulfonic acid and oxalic acid in turn, stirring until completely dissolved, and standing for 20-40min.
  6. 6. The metallographic etching method of a titanium palladium alloy according to claim 4 or 5, wherein, in step 2), The ethanol used for cleaning is absolute ethanol; Sandpaper with specifications of 200# 400# and 600# was used for sequential sanding.
  7. 7. The metallographic attack method of a titanium palladium alloy according to any one of claims 4 to 6, wherein in step 3) the effective working surface areas of the cathode and anode are the same.
  8. 8. The metallographic etching method of a titanium-palladium alloy according to any one of claims 4 to 7, wherein in step 4), the ethanol used for washing is absolute ethanol.
  9. 9. The metallographic etching method of a titanium palladium alloy according to any one of claims 4 to 8, further comprising the steps of: After the metallographic erosion is finished, a microscope or a scanning electron microscope is used for observing the grain boundary and the metallographic structure of the metallographic eroded titanium palladium alloy sample.

Description

Corrosive agent for metallographic corrosion of titanium palladium alloy and metallographic corrosion method Technical Field The invention belongs to the field of metallographic analysis, and particularly relates to an erosion agent and an erosion method for metallographic erosion of a titanium-palladium alloy. Background Titanium alloys (e.g., TA8, TA9, TA 10) have better resistance to more strong corrosion systems due to their excellent corrosion resistance, and their surface oxide films can have very good corrosion resistance, such as strong corrosion systems containing chlorine, alkali, nitric acid, sulfuric acid, and the like, and most of high-temperature organic acid systems, so that they are increasingly used in chemical devices. Meanwhile, the titanium palladium alloy such as TA9 of the palladium alloy is added, so that the titanium palladium alloy can resist a low-oxygen environment, an acid environment and a high-temperature chloride environment, and in boiling sulfuric acid with the concentration of 5%, the corrosion speed of the TA9 titanium palladium alloy is about 0.5mm/a, and compared with that of pure titanium, the corrosion speed of the titanium palladium alloy is greatly reduced. In the technical field of metal erosion, particularly, the metallographic analysis can rapidly judge the application performance of a titanium-palladium alloy which is a high-strength, light-weight and high-corrosion-resistance metal material. The metallographic erosion method is used to make the structure of the titanium-palladium alloy clearly visible, thereby facilitating observation and analysis. However, titanium palladium alloys are relatively difficult to attack because of their relatively high corrosion resistance. At present, main aggressive agents adopt hydrofluoric acid, perchloric acid and the like so as to achieve the effects of surface grain boundary and tissue appearance. However, hydrofluoric acid has strong corrosiveness, is easy to cause irreversible injury to human bodies in the use process, and has smell in the use process, so that the perchloric acid is easy to volatilize to cause injury of respiratory tracts of experimental staff. When the etchant is adopted, most of the etchant is eroded in a wiping or soaking mode, the erosion process is easily influenced by erosion time, reasonable erosion time is needed, excessive erosion or insufficient erosion effect can be caused due to overlong or too short erosion time, and in addition, high-corrosiveness media such as hydrofluoric acid, perchloric acid and the like are needed in the solution preparation process, so that personal injury can be caused to human bodies due to improper operation, and the risk is high. Thus, there is an urgent need in the art for safe, effective, corrosion-controllable etchants. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide an erosion agent and an erosion method for metallographic erosion of a titanium palladium alloy. The etchant can enable metallographic structure corrosion of the titanium palladium alloy to be easy to control, the process is safer, the metallographic structure easy to observe is easier to obtain, and the preparation and corrosion processes of the etchant are simple and convenient to operate. In order to achieve the aim of the invention, the invention adopts the following technical scheme: the invention provides an aggressive agent for metallographic attack of a titanium palladium alloy, which is prepared from the following raw materials: 10-20 parts of glycerin, 15-25 parts of methanol, 3-5 parts of benzenesulfonic acid, 3-10 parts of oxalic acid and 20-30 parts of deionized water. The etchant for metallographic attack of the titanium palladium alloy is preferably prepared from the following raw materials: 13-18 parts of glycerin, 20-25 parts of methanol, 4-5 parts of benzenesulfonic acid, 8-10 parts of oxalic acid and 20-25 parts of deionized water. The etchant for metallographic attack of the titanium palladium alloy is further preferably prepared from the following raw materials: 15 parts of glycerin, 25 parts of methanol, 5 parts of benzenesulfonic acid, 10 parts of oxalic acid and 20 parts of deionized water. The invention also provides a metallographic erosion method of the titanium palladium alloy, which comprises the following steps: 1) Sequentially adding deionized water, glycerol and methanol into a container, uniformly stirring, standing, sequentially adding benzenesulfonic acid and oxalic acid, and stirring until the benzenesulfonic acid and oxalic acid are completely dissolved to obtain an aggressive agent; 2) Cleaning a titanium palladium alloy sample by using deionized water and ethanol, removing surface attachments, airing, polishing by using sand paper, and mechanically polishing until the surface is smooth to obtain the titanium palladium alloy sample; 3) Placing the aggressive agent prepared in the step 1) into a container, selecting an