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Electropolishing or reverse plating is the process of smoothing metal
surfaces to make them highly resistant to corrosion. A blended chemical
electrolyte bath and rectified current is used to eliminate flaws from
the metal surface. High corrosion resistance, deburred edges, minimized
radio-active contamination, optimum reflectivity, and reduced friction
are some common benefits of electropolishing.
Electropolishing Process:
In electropolishing, a fabricated steel tank with rubber lining
containing concentrated acid or alkaline solution forms the electrolyte.
Stainless steel, copper, titanium, or any other metal to be polished
forms the positive side (anode) of the power source. On application of
an electric current, the metal at the anode dissolves into the
electrolyte. Protrusions, recesses, and rough surfaces, wherein the
current density is higher get dissolved faster than the other areas,
results in a smooth and uniform surface.
Electropolishing is best suited for polishing stainless steel parts.
Superior to pickling and mechanical polishing, it retains the luster,
adds corrosion resistant properties, and prevents tarnishing. Typically,
parts are electrocleaned prior to electropolishing. |
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