In the field of metallographic analysis, the sample preparation process is crucial to the accuracy of the experimental results. The EP-6100 electrolytic polishing corrosion instrument, with its excellent performance and efficient operation, has become an ideal choice for preparing metallographic samples. The electrolytic polishing corrosion instrument combines polishing and corrosion functions through the electrochemical principle, which not only achieves efficient sample preparation, but also does not produce deformation layers caused by mechanical processing. The reliability of the experimental results has been greatly improved.