The surface polished by electrolytic polishing will not produce a metamorphic layer, no additional stress, and can remove or reduce the original stress layer. It can process hard and soft materials that are difficult to mechanically polish, as well as thin-walled, complex-shaped, and small parts and products. The polishing time is short, and multiple pieces can be polished at the same time. The production efficiency is high, so it is often selected.

The surface roughness that can be achieved by electrolytic polishing is related to the original surface roughness. Due to the poor versatility of the electrolyte, short service life and strong corrosion, the application range of electrolytic polishing is limited, so you need to pay attention to its scope of application .

Electrolytic polishing is mainly used for metal products and parts with small surface roughness, such as reflectors, stainless steel tableware, decorations, injection needles, springs, blades, and stainless steel tubes. It can also be used to polish certain molds and metallographic abrasive discs. This shows that its scope of application is still very wide.

So what are the advantages of electrolytic polishing?

1. Greatly improve the surface corrosion resistance. Due to the selective elution of elements by electrolytic polishing, a dense and solid chromium-rich solid transparent film is formed on the surface, and an isoelectric surface is formed, thereby eliminating and reducing microbattery corrosion.

2. The micro-surface after electrolytic polishing is smoother than that of mechanical polishing, and the reflection rate is higher. This makes the equipment non-sticking, hanging, and easy to clean, and the surface of the workpiece is reduced by about 1 wire, which meets the requirements of GMP and FDA regulations.

3. Electrolytic polishing is not limited by the size and shape of the workpiece. Workpieces that are not suitable for mechanical polishing can be polished, such as the inner walls of elongated tubes, elbows, bolts, nuts, and inner and outer walls of containers.

What are the conditions for electrolytic polishing?

(1) There is a very small gap (called machining gap) between the workpiece anode and the tool cathode (mostly the forming tool cathode), generally in the range of 0.1-1mm.

(2) The electrolyte flows continuously from the processing gap at a high speed (6-30m / s) to ensure that the anode dissolution products and the heat generated by the electrolytic current through the electrolyte are removed and depolarized.

(3) The anode of the workpiece and the cathode of the tool are connected to a DC power supply (generally 10-24V). Under the above two process conditions, the current density through the machining gap of the two poles is very high, up to the order of 10-100A / cm2.

(4) The corresponding parts on the workpiece and the convex parts of the tool dissolve faster than other parts. As the tool cathode feeds the workpiece slowly, the workpiece dissolves continuously according to the profile of the end of the tool, the electrolytic product is constantly taken away by the high-speed flowing electrolyte, and the formation of the ultra-finished tool is "replicated" on the workpiece.