Electrolytic polishing – how does it actually work?
Electropolishing turns a rough stainless steel surface into a smooth, corrosion-resistant one. Without any mechanical polishing involved. At Heleon Pharma, we apply this electrochemical process to components for hygienic food and pharmaceutical environments. Here's how it works, and why it matters for your process.
A stainless steel surface can look as smooth as a mirror without ever having had a polished finish applied to it. How is that possible?
At Heleon Pharma, we do this using electrolytic polishing. Let us explain.
Electropolishing is used to make metal surfaces smoother, cleaner, and stronger by removing a tiny, controlled layer of material. Key benefits include corrosion resistance, microscopic smoothing, and easy cleaning.
How it works
We hang the component in an electrolyte bath as an anode. As soon as a current passes through it, oxidation takes place: metal ions dissolve from the surface.
But why does it become smoother?
Every surface is uneven at a microscopic level. The current density is higher on the small-raised areas, so material dissolves more quickly. In this way, the surface gradually flattens out — without mechanical contact, and therefore without creating new stresses in the material. Existing contamination on the surface dissolves away in the same process, rather than being pressed into it, as can happen with mechanical polishing.
And that is precisely why this process is important for hygienic applications, such as in the pharmaceutical industry: a surface without grooves where micro-organisms can adhere. Product also adheres less easily to the surface itself, reducing residue build-up during use, in addition to easier cleaning afterward.
At Heleon Pharma’s workshop, the EP bath is used for this purpose — depending on the order, either for smoothing weld seams or for complete components.
Do you still have questions about how this works, or what it could mean for you? Please contact our specialists.
☎️ Telephone: +31 (0)187 890 900
📬 Email: info.pharma@heleon-group.com