Parts Seiko News [September 2025 Issue]

This month, we will introduce "Electropolishing."
What is "Electropolishing"?
Electropolishing is a surface treatment technique that uses an acidic electropolishing solution to apply direct current to the metal surface, achieving smoothing and cleaning by microscopically dissolving it. It is widely used in advanced fields that require high cleanliness, such as medical components, food machinery, and semiconductor and liquid crystal manufacturing equipment.
Features of Electropolishing:
★ Smooths out the irregularities on the surface of stainless steel, resulting in a glossy finish and excellent corrosion resistance.
Since electropolishing is a method that microscopically dissolves the metal surface, it finishes flat at the micron level.
★ The surface is smooth and resistant to contamination.
Because the metal surface is dissolved and polished in the solution, any contaminants on the surface are removed during the process. The surface after electropolishing is highly smooth and resistant to new contaminants, ensuring excellent cleanliness.
★ Scratches and pinholes that are not visible with buff polishing become apparent.
Buff polishing is a method that grinds the metal surface. Therefore, while it may appear smooth at first glance, numerous scratches are present when viewed under magnification.
★ A passive film is formed by electropolishing, making it less prone to rust.
A strong passive film is formed on the metal surface, improving corrosion resistance.
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Parts Seiko Co., Ltd. Surface Treatment Division
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