Electropolishing is...scientifically... the anodic ion dissolution of metal in an electrolyte solution.

By explaining the mechanism by which electropolishing works will help answer the question

The part being polished is connected to the positive side of a power source and submerged in a specifically controlled electrolyte solution. Electrically conductive plates lining the wall of the electrolyte tank are connected to the negative side of the power source. The power is switched on and electrolysis takes place. At this point, surface metal on the part begins to dissolve VERY VERY slowly. The key to the electropolishing process is what happens MICROSCOPICALLY. At this level, we'll actually...the electron-microscopic level the surface of metal looks like a bunch of peaks and valleys. With the electropolishing process started the surface of the metal is begins to slowly erode away. Interestingly, the peaks are dissolved at a higher rate than the valleys. This in turn evens out and smoothes the metal surface, at the micron level. Visually the part looks like it has been polished.

Electropolishing is the only known technology that effects the surface of metal in this way!

Benefits of electropolishing:

• Super-Passivation
• Superior corrosion resistance
• Stress relieves surface
• Ultra-Hygienically clean surfaces
• Leaves a surface free of hydrogen and prevents contamination and multiplication of bacteria   
• Decarbonizes surface of metals
• No hydrogen embrittlement
• Prepares surface for welding by lowering resistance
• Reduces friction
• Brightens, polishes and deburrs in one step
• Smooth or sharpen edges depending on configuration
• Rust and Oxide removal
• Will expose existing stress fractures and crystaline imperfections of metal surface
• Another very important over looked benefit that electropolishing offers is the ability to expose errors and inconsistancies during part manufacturing. For example, a weldment of two or more pieces of 316 stainless using 304 or carbon steel fill rod. The difference between the two metals will be obvious.

Last updated on September 2, 2009 by Chilco