Electrolytic polishing method of cold-rolled copper-nickel composite baseband for EBSD (electron back-scattered diffraction) testing

Abstract

The invention discloses an electrolytic polishing method of a cold-rolled copper-nickel composite baseband for EBSD (electron back-scattered diffraction) testing, which comprises the following steps: carrying out mechanical polishing on the cross section of a Cu60Ni40 / Ni9W composite baseband with the cold-rolling deformation amount of 90-98%; preparing an electrolytic polishing solution from distilled water, concentrated sulfuric acid, phosphoric acid and glycerol in a volume ratio of 2:5:(2-7):(1-5); and by using the Cu60Ni40 / Ni9W composite baseband subjected to mechanical polishing as an anode and stainless steel as a cathode, connecting to a direct-current stabilized voltage supply with a wire, simultaneously immersing the Cu60Ni40 / Ni9W composite baseband subjected to mechanical polishing and the stainless steel in the electrolytic polishing solution to perform polishing, wherein the voltage is 6-9V, the temperature is 20-30 DEG C, the polishing time is 40-55 seconds, and the polishing pole distance is 35-45mm. The electrolytic polishing adopted by the invention does not need stirring. The prepared electrolytic polishing solution can remove the stress layers on the inner and outer materials of the cross section of the Cu60Ni40 / Ni9W composite baseband without causing over etching on the inner and outer materials, can obtain the bright copper-nickel composite baseband cross section, and can obtain high diffraction pattern quality in EBSD testing.

Description

Technical field [0001] The invention belongs to the technical field of electrolytic polishing, and in particular relates to an electrolytic polishing method of a cold-rolled copper-nickel composite base tape used for EBSD testing. Background technique [0002] Yttrium-based high-temperature superconductors have high irreversible fields, high current-carrying capacity and potential price advantages, which make them have potential applications in power, transportation, military and many other aspects. The yttrium-based high-temperature coating superconductor prepared based on the RABiTS technical route is mainly composed of a tough textured metal base tape, a transition layer, a superconducting layer and a protective layer. The textured metal base tape is the key to the RABiTS technology. In research, people often use EBSD technology as a conventional micro-texture analysis method. Because the test technology is based on obtaining clear Kikuchi patterns, it has relatively high requ...

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Problems solved by technology

Stress will be generated during the large deformation cold rolling process of the base strip, which seriously affects the reliable micro-orientation information obtained by EBSD test. In the research of textured metal base strip, nickel-tungsten composite base strip is the most studied textured metal base strip. Stress in the rolled nickel-tungsten composite base strip. Some scholars have used electrolytic polishing for the cold-rolled nickel-tungsten composite base strip to effectively solve the stress problem in the nickel-tungsten composite base strip. The composition of the layer materials is quite different, and it is difficult to obtain a good polishing effect on the inner and outer layer materials of different compositions by using electrolytic polishing technology to relieve stress at the same time. When characterizing the micro-texture, how to eliminate the stress existing in the cross-section of the composite substrate and obtain a bright cross-section through a suitable electrolytic polishing process brings certain challenges to the characterization of the micro-texture of the cold-rolled composite substrate.

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