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Glassbeading 
Passivation
Passivation is a process performed to make a surface passive,
i.e., a surface film is created that causes the surface to
lose its chemical reactivity. Passivation unipotentializes
the stainless steel with the oxygen absorbed by the metal surface,
creating a monomolecular oxide film. Passivation can result
in the very much-desired low corrosion rate of the metal.
Passivation is performed on
clean stainless steel, providing the surface has been thoroughly
cleaned or descaled. Since the term "passivation" is
used to describe distinctly different operations or processes
relating to stainless steels, it is necessary to define precisely
what is meant by passivation.
Mechanical Polishing
Highland Equipment Limited also specializes in sanitary polishing of stainless
steel fabrications. We can have your product mechanically polished ID and OD
to 3A standards
or higher finishes.
Electropolishing
Electropolishing is an electrochemical process similar to, but the reverse of,
electroplating. The electropolishing process smoothes and streamlines the microscopic
surface of a metal object. As a result, the surface of the metal is microscopically
featureless, with not even the smallest speck of a torn surface remaining.
In electropolishing, the metal is removed ion by ion from the surface of the
metal object being polished. Electrochemistry and the fundamental principles
of electrolysis (Faraday's
Law) replace traditional mechanical finishing techniques, including grinding,
milling, blasting and buffing as the final
finish. In basic terms, the object to be electropolished is
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immersed
in an electrolyte and subjected
to a direct electrical current. The object is maintained anodic, with the cathodic
connection being made to a nearby metal conductor.
In summary, electropolishing removes metal. It does not move it or wipe it. As
a result, the surface of the metal is microscopically featureless, with not even
the smallest speck of a torn surface remaining. The basic metal surface is subsequently
revealed – bright, clean and microscopically smooth. By contrast, even
a very fine mechanically finished surface will continue to show smears and other
directionally oriented patterns or effects he electropolished component will
have an improved corrosion resistance and brighter appearance.
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2B Sheet |
#4 Mill Finish |
Mill Plate |
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Before Electropolishing |
After Electropolishing |
Before Electropolishing |
After Electropolishing |
Before Electropolishing |
After Electropolishing |
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