• Electropolishing

What is Electropolishing?

Electropolishing is an electrochemical process by which surface material is removed by anodic dissolution. Electropolishing removes surface material, beginning with the high points within the microscopic surface texture. By removing these points, the electropolishing process will improve the surface finish of a metal such as stainless steel, nickel, aluminum and hastelloy, leaving a smoother and more reflective surface.

The Benefits of Electropolishing

The benefit of electropolishing is that it delivers a smoother, more reflective surface that reduces product adhesion and improves surface cleanability. Perhaps more importantly, electropolishing preferentially dissolves free iron, inclusions, and embedded particles from the surface of the work-piece. This process improves the near surface chemistry of the material and promotes the formation of an improved corrosion resistant surface layer.

Harrison Electropolishing is a leading provider of electropolishing services for industrial and high purity industries. Since our opening in 1980 we have continually worked to expand and improve our services. Today, with over 50 employees and expanded operating hours, Harrison Electropolishing is well suited to provide electropolish services for a multitude of industries. 

INDUSTRY STANDARDS

  • ASTM B912

    Standard Specification for Passivation of Stainless Steal Using Electropolishing

  • SEMI F17

    Specification for High Purity Quality Electropolished 316L Stainless Steal Tubing, Component Tube Stubs and Fittings Made from Tubing

  • SEMI F19

    Specification for wetted surface finishes of electropolished 316L stainless steal components

  • ASME BPE

    Specification for bioprocessing equipment in the pharmaceutical industry, components of a distribution system or conveyor belts

Electropolishing Process

Electropolishing is accomplished by creating an electrochemical cell in which the material to be polished is charged anodically. A cathode is formed to mirror the geometry of the work-surface and the two are submerged in a heated electrolyte bath. When a DC current is applied, the electrical charge forces metal ions to be dissolved from the stainless steel work-surface. Depending on the runtime of the electropolishing process and the dimensional tolerances of the component to be electropolished, the amount of material that can be removed ranges from 0.0003” to 0.003”.

Prior to Electropolishing

The key to the electropolishing process is the difference in current density across the surface. Within the microscopic surface profile, the current density is greater at the high points and lesser at the low points. The rate of the electropolishing reaction is directly proportional to the current density. The increased current density at the raised points forces the metal to dissolve faster at these points and thus tends to level the surface material. After the electropolishing treatment, the work-piece is passed through a series of steps to neutralize, rinse, clean and dry the surfaces.

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Electropolishing Capabilities

Our capabilities allow us to process components of all sizes. While most process equipment may fit within our electropolishing tanks, we have developed proprietary techniques in order to electropolish larger components. 
These proprietary techniques allow us to process equipment of any size at our facility or in the field

Electropolishing Facility

  • 25,000 square foot facility, expanded and updated in 2011
  • 360 square foot class 1000 cleanroom
  • Three overhead cranes
  • 15,000lbs material handling capability
  • Four fulltime electropolishing lines
  • Expanded operating tanks

 

WHAT IS ELECTROPOLISHING?

Benefits of Electropolishing

Benefits of Electropolishing

Learn more about some of the benefits of electropolishing.

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Stainless Steel Electropolishing

Stainless Steel Electropolishing

Stainless steel combines desirable mechanical properties with a known and proven level of corrosion resistance.

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Nickel Electropolishing

Nickel Electropolishing

Nickel alloys, including Hastelloy, Inconel and Monel require special consideration when electropolishing.

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Aluminum Electropolishing

Aluminum Electropolishing

Aluminum can be divided into two major categories: wrought and casting alloys.

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Hastelloy Electropolishing

Hastelloy Electropolishing

Electropolishing Hastelloy can reverse the adverse effects of degradation by real world fabricating and handling operations.

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ASME BPE Specifications

ASME BPE Specifications

ASME-BPE is the leading Standard on how to design and build equipment and systems used in the production of biopharmaceuticals.

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Electropolishing Conveyor Belts

Electropolishing Conveyor Belts

Harrison Electropolishing has developed and assembled a continuous polishing system capable of electropolishing stainless steel conveyor belts.

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Electropolishing Portfolio

Electropolishing Portfolio

View our portfolio of electropolishing work.

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