Why Combine Mechanical Polishing with Electropolishing?

Combining mechanical polishing with electropolishing can offer significant advantages, particularly in industries like pharmaceuticals, where surface quality, cleanliness, and performance are paramount. Mechanical polishing may be necessary in conjunction with electropolishing in the following scenarios:

  • Pre-Treatment for Electropolishing:
    • In cases where the stainless steel surface has deep scratches, weld seams, or other surface imperfections, mechanical polishing may be required as a pre-treatment to remove these defects before electropolishing.
  • Surface Smoothing:
    • When the stainless steel surface requires additional smoothing beyond what electropolishing alone can achieve, mechanical polishing can be used to achieve the desired level of surface roughness.
  • Optimal Cleanliness:
    • Mechanical polishing can introduce contamination or embed particles in the surface. Electropolishing cleans the surface at the microscopic level, removing embedded particles and contaminants introduced during mechanical polishing.
  • Superior Aesthetic Quality:
    • Mechanical polishing provides a good initial finish and shape, while electropolishing produces a bright, shiny, and aesthetically superior final finish.
  • Complex Geometries:
    • For components with complex geometries or intricate designs, electropolishing can smooth areas that mechanical polishing cannot reach.
  • Targeted Surface Modification:
    • In some cases, mechanical polishing may be used to selectively modify specific areas of the stainless steel surface before electropolishing to achieve a desired surface texture or finish.
  • Custom Surface Specifications:
    • When specific surface roughness or texture requirements cannot be met through electropolishing alone, a combination of electropolishing and mechanical polishing may be employed to achieve custom surface specifications.
  • Edge and Corner Treatment:
    • Mechanical polishing may be necessary to address sharp edges, corners, or burrs on stainless steel components that require smoothing or deburring before electropolishing.
  • Increased Lifespan of Equipment:
    • The combination of both processes results in a surface that is not only smooth and clean but also has fewer stress concentrators and surface defects, leading to longer equipment life and better performance.


When deciding between electropolishing and mechanical polishing, it is crucial to evaluate the specific requirements of your application. Consider factors such as the desired surface finish, corrosion resistance, functionality, and cost-effectiveness. Mechanical polishing is often used in conjunction with electropolishing to address specific surface imperfections, achieve targeted surface modifications, and ensure that the final surface finish meets the desired specifications, particularly in cases where either process alone may not be sufficient to achieve the required surface quality.