Electropolishing Services for Precision Metal Finishing

Eddy Bullock – threefiftyconcepts.com

Electropolish is a performance coating that uses a precision electrochemical process to enhance the surface of stainless steel and other metals. Also known as reverse plating, the technique removes imperfections, creating a bright finish that’s ideal for industrial applications.

At Hale Performance Coatings, we remove the iron from your substrate material to enhance the chrome and nickel, resulting in a corrosion-resistant surface. Our team knows precision treatments, so you can rely on us to be your source for electropolishing.

We continue to develop more effective plating and polishing solutions that can withstand wear and tear and provide visual appeal. Partner with a team that takes pride in their work so you can enjoy a high-quality final product.

Benefits of Electropolishing for Industrial Applications

Corrosion resistance: Because electropolishing removes impurities like iron particles, the substrate is less likely to rust. The process creates a chromium-rich layer that’s well-suited for harsh conditions in medical, marine and chemical processing applications.

Smoother substrate surface: Electropolishing dissolves microscopic peaks from metal, resulting in a more uniform finish. That reduces friction, allowing for greater accuracy in precision applications.

Deburring and rounded edges: Machining and welding can leave microcracks, burrs and irregularities that affect appearance and function. Electropolishing eliminates them to create rounded edges that perform better in the long run.

Easier maintenance: A smooth surface is easier to clean and maintain since it’s less likely to trap dirt, contaminants and bacteria on a microscopic level. That’s crucial for food and beverage, medical and electronic applications.

Enhanced appearance: Electropolishing produces a shiny, reflective finish that’s effective for visible components and consumer products.

Materials That Suit Electropolishing

Metals must be electrically conductive and chemically resistant to handle electropolishing. Some materials, like zinc, are too soft, while others, like magnesium, are highly reactive to the process.

The following metals can be electropolished:

• Stainless steel
• Aluminum
• Titanium
• Copper and copper alloys
• Nickel and nickel alloys
• Carbon steel

Our Electropolishing Process

Cleaning and Degreasing

Removing oil, dirt and oxides optimizes the electropolishing process. We use a solution to remove fingerprints, machining fluids and other organic residues. Once the solution is rinsed off, we may include a mild acid rinse to eliminate rust.

Electropolishing

The part is placed in an acidic electrolyte solution. The metal component becomes the anode while the cathode is situated in another tank. An electrical current runs between the anode and cathode, dissolving metal ions from the peaks of the substrate.

Rinsing and Neutralizing

After the electropolish is applied, we put each metal part in deionized water. That also includes an alkaline rinse to neutralize the chemical action created by the polishing. That removes any acidic residue from the surface.

Drying and Inspection

Electropolished parts typically air dry, but we can use compressed air or nitrogen to expedite this step and prevent water spots. We conduct a final inspection to check for pitting, discoloration, roughness and brightness.

Electropolishing vs. Mechanical Polishing

Both polishing options can create smooth metal surfaces but differ in their application and effectiveness. While electropolishing dissolves microscopic peaks with acid and electricity, metal polishing requires physical abrasion and buffing. Because mechanical polishing uses direct tool contact, it can cause uneven layers when not done properly.

Electropolishing enriches a metal’s chromium layer to enhance its corrosion resistance, while mechanical techniques are designed to remove deep scratches and material buildup. You can also use the mechanical application on almost any solid surface, whereas electropolishing is limited to specific metals.

Get a Quote

Contact our team to schedule a consultation or request a quote for electropolishing services.

FAQs

Does electropolishing affect part dimensions?

While the process does remove a thin layer from the substrate’s surface, it doesn’t distort a part’s geometry. The reduction is typically 2.5 to 50 microns.

How long does the process take?

The duration depends on the metal, surface condition, current density and electrolyte temperature. The process can take 30 seconds to several minutes.

Is it safe for medical-grade components?

Yes, it’s often preferred for medical devices and equipment.

What industries benefit the most from electropolishing?

This finishing process is suitable for the following industries:

• Medical and pharmaceutical
• Food and beverage processing
• Aerospace
• Electronics
• Architecture
• Automotive