Electropolishing

2021-10-05

Electropolishing

Overview

The workpiece is used as the anode to connect to the positive pole of the DC power supply. Use lead, stainless steel and other conductive materials resistant to electrolyte corrosion as the cathode, and connect to the negative electrode of the DC power supply. The two are immersed in the electrolyte (generally based on sulfuric acid and phosphoric acid) at a certain distance, and at a certain temperature, voltage and current density (generally less than 1A/cm2), electrify for a certain period of time (generally several tens of seconds to A few minutes), the tiny protrusions on the surface of the workpiece dissolve first, and gradually become a smooth and shiny surface.

Features:

1.The polished surface will not produce a metamorphic layer, no additional stress, and can remove or reduce the original stress layer;

2.For hard materials, soft materials and thin-walled, complex-shaped, and small parts that are difficult to be mechanically polished Both products can be processed;

3.The polishing time is short, and multiple pieces can be polished at the same time, and the production efficiency is high;

4.The surface roughness that can be achieved by electrolytic polishing is related to the original surface roughness, and generally can be increased by two levels. However, due to the poor versatility of the electrolyte, short service life and strong corrosiveness, the application range of electrolytic polishing is limited. Electrolytic polishing is mainly used for metal products and parts with small surface roughness, such as mirrors, stainless steel tableware, decorations, injection needles, springs, blades and stainless steel tubes.

Process flow

Degreasing - washing - derusting - washing - Electropolishing - washing - neutralization - washing - passivation - packaging

Advantage

1.The inner and outer colors are consistent, the luster is long-lasting, and the recesses that cannot be thrown by mechanical polishing can also be leveled.

2.High production efficiency and low cost.

3.Increase the corrosion resistance of the workpiece surface.