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.

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

References in periodicals archive ?
As explained in the methodology the edge sharpness of Al samples was reduced by varying electropolishing time.
An electropolishing treatment was applied to both of the above ferritic stainless steels, and their corrosion resistance was compared to that of SUS316L.
Because passivation and electropolishing are wet processes, there is a limit to when they can be done in the manufacturing sequence.
The first was called electropolishing and was done by BlackStar down in Texas.
Able specializes in providing electropolishing service for a variety of common and specialty metal alloys.
A lot of our success has been down to our desire to continually evolve, so that we lead the rest of the UK in electropolishing and pickling.
In this circuit the electropolishing current is controlled by means of potentiometer Rc.
The interior finish is 180 grit, through mechanical polishing, followed by electropolishing.
Because the stencil already has smooth aperture walls, additional post-processing steps like electropolishing to make the walls smooth are not necessary.
For best results after electropolishing, wet and final processing of the tubing should be performed in Class 100 clean rooms with Class 10 zones.
We also supply valueadded services such as laser welding, CNC machining, electropolishing, Nitinol shape-setting, and cleanroom assembly.