Electropolishing, also known as electrolytic polishing
Electropolishing, also known as electrolytic polishing, is an electrochemical process used to remove a thin layer of metal from the surface of a workpiece. This process results in a smooth, bright, and highly corrosion-resistant surface. It is often applied to stainless steel and other metals to achieve both functional and aesthetic benefits. During electropolishing, the workpiece is submerged in a mixture of acids. An electric current is passed through the solution between an anode and a cathode. The current causes controlled oxidation and dissolution of the metal surface, equalizing and removing peaks and irregularities.
Advantages of electropolishing
- Increased corrosion resistance
By removing surface imperfections and forming a uniform, chromium-rich oxide layer, electropolishing significantly improves corrosion resistance. - High hygiene
The smooth surface is easier to clean and disinfect, making it ideal for applications in the pharmaceutical, medical, and food industries. - Removal of contaminants
The process removes inclusions, contaminants, and surface impurities such as weld oxides and other imperfections. - Slightly reduces roughness value
Disadvantages of electropolishing:
- Cost: Electropolishing is more expensive compared to traditional stainless steel post-treatments.
- Aesthetics: It gives a specific, shiny surface where small imperfections are magnified, and an electropolished piece is less aesthetic. Purely for aesthetic purposes, there are better finishes; electropolishing primarily provides a highly cleanable and anti-corrosion surface.
For a fee, an electropolishing certificate can be provided.
Additionally, an extra 'de-blackening' treatment can be requested.