Mechanical and Electropolish
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Mechanical polishing covers grinding, buffing, and polishing - all processes for improving the surface conditions of a product for decorative or functional purposes. The various techniques are abrading operations ; although, some plastic working of the surfaces may occur, particularly during buffing.
mechanical Polishing Process
The process is to do grinding first, polishing second, and buffing third. In general, grinding permits far more aggressive abrading action than polishing. Likewise, polishing is a far more aggressive abrading action than buffing. In grinding, polishing and buffing, labor is a major variable in the process. The requirement is highly skilled labor with years of experience and a thorough knowledge of their craft. The basic mill plate and sheet metal finishes for stainless steel include five grades that have finishes that are produced mechanically by using abrasive compositions and buffing wheels.
Electropolishing, also known as electrochemical polishing, anodic polishing, or electrolytic polishing, is an electrochemical process that removes material from a metallic workpiece, reducing the surface roughness by leveling micro-peaks and valleys, improving the surface finish.
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.
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