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home Best Technology / FAQs / What’s the difference in passivation and electropolishing?

What’s the difference in passivation and electropolishing?

As a non-electrolytic process, passivation uses solutions like citric and nitric acids instead of an electrical current used in electropolishing to create a inert oxide layer / film and remove free iron and foreign matter from metal surfaces.

Electropolishing, a non-mechanical interactive process, can be used on objects with complex geometries.  The electropolishing  process uses a combination of electrolytic chemicals and an electrical current to carefully eliminate imperfections and contaminants of metal part surfaces. This particular process is an alternative to abrasive fine polishing.  

Electropolishing can be used to polish, deburr, and smooth metal components whereby doing so also causes material removal to occur including the free irons on the surface of the part. Electropolishing would be the more appropriate approach when  aesthetics are necessary.  A smoother, polished surface can result from electropolishing.

Passivation, on the other hand, does not change or brighten the surface appearance, and is not an effective method for improving surfaces that have been welded with oxide heat effect scale or heat treated.

Latest News & Products from Best Technology

Semi-Automated Inline Citric Passivation Solution with Data Tracking

For one medical device manufacturer, the design of a citric passivation solution faced two major challenges: The manufacturing process required performing a water-break test after cleaning parts, before proceeding to passivation. This meant that they could not use a fully automated passivation solution. The system had to have data tracking for quality control purposes. Semi-Automated […]

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  • Industrial Parts Washers
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    • What is Passivation? How Does It Work?
    • Nitric vs. Citric Acid Passivation
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14040 23rd Avenue N.  
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  • Request More Information
  • Industrial Parts Washers
    ✛
    • Agitated Immersion Heated Parts Washers
    • Inline Conveyor Wash-Rinse-Dry Parts Washers
    • Immersion Inline Parts Washer
    • Spray Cabinet Parts Washers
      ✛
      • Front Load Spray Cabinet Parts Washer
      • Top Load Spray Cabinet Industrial Parts Washer
    • Vertical Door Pass Through Parts Washer
    • Rotary Drum Parts Washer
    • Powder Coat Prep Equipment
    • Phosphating Lines
    • Pipe Washing Equipment
  • Precision Cleaning Systems
    ✛
    • Applicable Articles
    • How clean is clean?
    • How Do Ultrasonic Cleaners Work?
    • Ultrasonic Benchtop Parts Cleaner
    • Benchtop Ultrasonic Parts Cleaning Multi-Tank Systems
    • Ultrasonic Cleaning Consoles
    • Automated Ultrasonic Parts Cleaning Equipment Wash-Rinse-Dry
    • Large Scale Automated Precision Aqueous Cleaning for Cellular Manufacturing
    • Agitated Immersion Ultrasonic Parts Washer
    • Machine Shop Parts Washer for Swiss and CNC Precision Parts
    • Immersible Ultrasonic Transducers
    • Vapor Degreasers
  • Passivation Equipment
    ✛
    • Applicable Articles
    • What is Passivation? How Does It Work?
    • Nitric vs. Citric Acid Passivation
    • CitriSurf – Citric Acid Passivation
    • Benchtop Ultrasonic Passivation Equipment
    • Ultrasonic Automated Passivation Equipment
    • Automated Ultrasonic Passivation System for Medical Device Parts
    • Passivation Wet Bench for Citric / Nitric Acid
    • Cleanroom Space Saving Automated Passivation System
    • Heated Polypropylene Acid Passivation and Rinse Tanks
    • Agitated Immersion Multi-Tank Passivation Systems
    • Automated Chemical Neutralization Cart
  • Electropolishing Equipment
    ✛
    • What is electropolishing? How does electropolishing work?
    • Electropolishing Cycle and Current Calculator
    • What is Dry Electropolishing? How does it work?
    • Passivation vs. Electropolishing
    • Table Top Electropolishing Equipment & Electropolishing Machines
    • Electropolishing Wet Benches
    • Large Scale Part Electropolishing Systems
    • Dry Electropolishing Machines
    • EP System – Open Top Wet Bench with Spray Rinse
  • Surface Finishing Systems
    ✛
    • Alodine Lines
      ✛
      • What is Alodine / Chem film / Chromate Conversion Coating?
      • Alodine Chem Film Tank Line
    • Mass Finishing Machines
      ✛
      • Centrifugal Barrel Finishing Machines
      • Spin Dryers / Chip Wringers
      • Vibratory Bowl Polishers
    • Titanium Anodizing Equipment
  • Wet Benches
    ✛
    • Citric / Nitric Passivation Wet Bench for Stainless Steel & Titanium
    • Electropolishing Equipment in a Wet Bench / Fume Hood
    • Fume Hoods
    • Wet Benches for Semiconductor & FM4910 Applications
    • Quick Dump Rinse Tank
  • Specialty & Custom Industrial Process Systems
    ✛
    • Contents Restoration
    • Vapor and Dryfilm PTFE Coating Systems
    • Heated Hot Air Parts Dryer
    • Solvent Recovery Equipment
  • Precision Cleaning Chemistries, Solvents & Fluids
    ✛
    • Why Use a Parts Cleaning Solvent?
    • 3M Novec Engineered Fluids, Fluorinert Liquids, Solvents & Chemicals
    • Solvent Cleaning with 3M Novec Engineered Fluids
    • Thermal Management / Heat Transfer with 3M Novec and Fluorinert Fluids
    • 3M Novec 72DA 73DE Solvent Vapor Degreaser For Medical Device Instruments
    • Solvent Phase-outs
      ✛
      • AK225 HCFC-225 Phase Out and Replacement with 3M Novec HFE Engineered Fluids
      • Medical Device AK 225 Replacement with 3M Novec Engineered Fluid Solvent
      • nPB Replacement
    • Aqueous Cleaning Chemistries
  • Case Studies
    ✛
    • Industrial Parts Washer Case Studies
    • Part Cleaning Case Studies
    • Passivation Systems Case Studies
    • Part Finishing Equipment Case Studies
    • Precision Cleaning Systems Case Studies
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