Mechanical polishing and electropolishing are the two common metal polishing methods. Wondering which is better and their advantages and disadvantages? Our following guide will tell you.

Mechanical polishing removes the parts of convexities, corrosion, scratch to get a smooth surface. Tools include wool wheels, sandpaper, stone sticks, etc.
 

Advantage

High brightness

Good leveling property

Disadvantage

Low repeatability
It only polishes a part at a time. The consistency of brightness is hard to be maintained. The possibility of damage For parts with strict cleanliness requirements, such as aerospace, medical, semiconductor, food, or automotive industries, the abrasive practices may damage their surfaces.
Weakened surface strength
The generated conclusions from the polishing can't be cleaned completely. They get deeper into the surfaces with the processing. The conclusions cause cracks and fatigue failure to the materials, even strong steel.

Electropolishing is a surface finishing process. The metal part is soaked in the electrolyte solution. When the connected DC current activates, the convexities are removed. Depending on the part tolerance and surface smoothness, the process can improve the surface finish by 10%-40%.

Advantage
Ultraclean finish
The electropolishing removes a uniform layer of surface material which create a smooth surface without particles or other contaminants.
Lasting smoothness and brightness

Disadvantage
Rough surface defects can not be removed
The chemical ingredient of the electrolyte solution may have an effect on the metal.
High cost

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