electropolishing

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electropolishing

[i¦lek·trō′pä·lə·shiŋ]
(metallurgy)
Smoothing and enhancing the appearance of a metal surface by making it an anode in a suitable electrolyte. Also known as electrolytic brightening; electrolytic polishing.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

Electropolishing

A method of polishing metal surfaces by applying an electric current through an electrolytic bath in a process that is the reverse of plating. The metal to be polished is made the anode in an electric circuit. Anodic dissolution of protuberant burrs and sharp edges occurs at a faster rate than over the flat surfaces and crevices, possibly because of locally higher current densities. The result produces an exceedingly flat, smooth, brilliant surface.

Electropolishing is used for many purposes. The brilliance of the polished surface makes an attractive finish. Because the polished surface has the same structural properties as the base metal, it serves as an excellent surface for plating. Electropolishing avoids causing differential surface stresses, one of the requirements for the formation of galvanic cells which cause corrosion. Because no mechanical rubbing is involved, work hardening is avoided. Contaminants, which often are associated with the use of abrasives and polishing compounds, are also avoided. The surface is left clean and may require little or no preparation for subsequent treatment or use. Electropolishing also minimizes loss of high-temperature creep-rupture strength. See Electroplating of metals

McGraw-Hill Concise Encyclopedia of Engineering. © 2002 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
7 August 2019 - US-based medical device manufacturer Biomerics has merged with Connecticut, US-based Northeast Laser and Electropolish, a contract services provider to medical device manufacturers, the company said.
However, the obtained surface layer consisted of a mixture of [alpha] and [gamma] phases, which made it more difficult to electropolish [10].
Here is a partial list of alloys we can electropolish:
John Swain said: "We've come a long way since our first sub-contract order to electropolish stainless steel chocolate moulds for Cadbury's Milk Tray back in the 70s.
The Metfab Electropolishing System lets manufacturers sharpen, deburr, passivate, and electropolish parts such as surgical drills, stents, and screens in-house.
In addition, plastic or stainless options are available for both manual and actuated valves, standard internal surface finishes are available--corresponding to BPE-SFV3 (30 Ra max), SFV4 (15 Ra max electropolish) and SFV6 (25 Ra max electropolish)--and the common body size for all the mini valve sizes allows interchangeability of bonnet, actuator and diaphragms.
Custom agitation systems can include specialty inclined agitators, vacuum pressure designs including mechanical seals, heavy-duty designs to 2,000,000 CPS, and custom pharmaceutical grade finishes including electropolish. In developing your process, remember: the standard pharmaceutical, cosmetic, and food processing equipment can now be designed to include the best of Lee Industries and Groen Process Equipment proven designs.814-342-0470.
Figure 1 shows scanning electron microscope (SEM) pictures of laser-cut apertures with no electropolish, with electropolish and with electropolish followed with nickel plating.
The unit is offered in stainless steel, Hastelloy, or alternate metals with optional pharmaceutical grade mechanical and electropolish finishes.
Other features include the use of borosilicate glass, which has a contact surface of 220 Grit Electropolish and an ormoned housing to help protect the glass from external objects and pipe stress.
Custom agitation systems can include specialty inclined agitators, vacuum pressure designs including mechanical seals, heavy-duty designs to 2,000,000 CPS, and custom pharmaceutical grade finishes Including electropolish. In developing your process, remember, the standard pharmaceutical, cosmetic, and food processing equipment can now be designed to include the best of Lee Industries and Groen Process Equipment proven designs.
The filter housings feature finishes available for wetted surfaces and the outer housing of the vessels, which include a 32 micro-inch sanitary with a bright electropolish finish.