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ISPE Glossary of Pharmaceutical and Biotechnology Terminology
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Electropolishing
(ASTM B 912 - Standard Specification for Passivation of Stainless Steel Using Electropolishing) The electrochemical process in which the article(s) to be passivated are treated anodically in a suitable acid medium.
Surface passivation occurs simultaneously with electropolishing under proper operating conditions. The quality of passivation will depend on the type of stainless steel, the formulation of the electropolishing solution, and the conditions of operation. Free iron on the surface of stainless steel is removed resulting in improved corrosion resistance. Surface smoothing obtained by electropolishing will also improve corrosion resistance. Electropolishing will also remove heat tint and oxide scale.
Electropolishing
Controlled electro-chemical process utilizing acid electrolyte, DC current, anode and cathode to smooth the surface by removal of metal.
Publication Source: ISPE Baseline® Guide, Vol. 4: Water and Steam Systems (First Edition)
Publication Date: 2001
Electropolishing
Controlled electro-chemical process utilizing acid electrolyte, DC current, anode and cathode to smooth the surface by removal of metal.
Publication Source: ISPE Baseline® Guide, Vol. 4: Water and Steam Systems (Second Edition)
Publication Date: 2011
Electropolishing
Also known as “chemical machining” and “reverse plating”, electropolishing is an electrochemical process far superior to any available mechanical process for the removal of minute surface imperfections in stainless steel. It levels and brightens the material surface by anodic dissolution in an electrolyte flowing solution with an imposed electrical current. When the proper combination of electrolyte current & temperature is attained, the high points of surface irregularities, or high current density areas, are selectively removed at a greater rate than the remainder of the surface resulting in improved surface smoothness. During electropolishing, the polarized surface film is subjected to the combined effects of gassing (oxygen) that occurs with electromechanical metal removal, saturation of the surface with dissolved metal, and the agitation and temperature of the electrolyte.
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