Distinguishing between perfect and imperfect electropolishing | Limat | 23.12.08


Electrochemical metal polishing sets a high industrial standard. The process must produce smooth, flawless, high-gloss metal surfaces. Metals subjected to electropolishing are not supposed to exhibit any signs of streaking, chipping or corrosion, nor should they suffer from water stains, asymmetry, striations, scratches or any other blemish to the finish.

Quality electrochemical polishing begins with using the best products. Quality products alongside experience, professional techniques and optimal execution conditions greatly increase the chances achieving the desired result.

Stainless steel parts made out of certain alloys can prove more challenging, and indentations, exposed joints, an uneven finish and a generally “unfinished” look are some of the things which occur when the polishing process encounters problems. The reasons for that vary, but they mostly stem from improper work conditions. 

Naturally, the best results can be seen on surfaces sporting simple shapes. Metals who sport complex features, such as angles, are more challenging. Mechanical polishing will not yield the desired results on such surfaces. 

Spotting the difference between quality electropolishing an unprofessional electropolishing is a little like distinguishing  between real and fake bank notes: the best way to learn how to tell them apart is by knowing what the real thing looks like. Once you know that, you will be able to tell the difference between low-grade electropolishing and quality electropolishing, easily.  

Many industries choose electrochemical polishing for its flawless finish, which affords the metals high corrosion resistance and creates a smooth, shiny surface. When aiming for the latter, a simple visual inspection will immediately indicate between the two, since if the surface is not uniform in luster, or has any imperfections, the process was low-grade. Nevertheless, a microscopic examination, which will determine whether the surface is smooth enough, is also required in order to ensure the surface is bacteria and rust resistance.

Many polished metals may appear, to the untrained eye, as if they had undergone electropolishing. Only a  microscopic examination will show that the surface of such metals is, in fact, not smooth.

Electrochemical polishing is the only process which can guarantee a metal's long-term hygiene and rust-resistance, making it highly cost effective, especially for sensitive industries.