If you want to make a good system, you need to do many steps, practice more and summarize more.

1. Sample cutting: Cut the sample with a good metallographic cutter, and the cut sample will be smooth.

2. Pre-grinding: No.400 metallographic water-resistant sandpaper →800 mesh metallographic water-resistant sandpaper → 1200 metallographic water-resistant sandpaper.

3. Polishing: Polishing requires at least two processes, and the selection of polishing cloth and polishing agent is very important, from coarse to fine.

4. Cleaning: Wash with distilled water and analytically pure hexanol, otherwise the polished sample will be polluted into a dirty sample.

5. Erosion: According to different metallographic requirements, choose the corresponding etchant and erosion time.