Electrolytic polishing, chemical polishing and baff polishing

Respective salient features of
electrolytic polishing, chemical polishing
and buff polishing

Electrolytic polishing

When the direct current is turned on to the subject metal as plus, during dipped in the respective electrolytic polishing solvent, the metal surface brings about the phenomenon of smoothness and brilliance of the metal surface, together with the proceeding of metal melting.
Electrolytic polishing is the method that has capitalized on the phenomenon, the method has been employed to especially austenite type stainless (SUS304 and SUS316, etc.) and aluminum.
While mechanical grinding (grinder, sandpaper, buff) removes the unevenness of the surface through cutting, transformation and abrasion by the force of whetstone with pressure, on the other hand electrolytic polishing method gains smoothness and brilliance achieved by the effect of preferential melting of surface convex portions which has been deemed to be very clean polishing method, without forming process degenerated layer, nor leaving any burning marks nor stains caused by residues on its surface.

  • Our unique electrolytic polishingOur unique electrolytic polishing
  • Possible to remove minute burrPossible to remove minute burr

Chemical polishing

Chemical polishing is a method to melt the surface of the subject metal by the chemical response dipped in the special solvent.
Chemical polishing as well as electrolytic polishing carries out polishing to stainless formed product, however, chemical polishing has been more suitable to be employed to such cases as to remove foreign substances, residual scales from the stainless surface that has complicated shapes and their washing.

  • Chemical polishing being possible but electrolytic polishing being difficultChemical polishing being possible but electrolytic polishing being difficult

Buff polishing

Buff polishing is the way to polish the subject substance by those clothes cut into circle and saw them to have certain thickness or bias shaped clothes piled up into some thickness coated with polishing agent around their outer ends.
This process method has the feature to polish only surface of the formed items, different from polishing by grinder machine.

The major process of the polishing starts with rough polishing and proceed up to final finishing polishing to have brilliance on its surface, taking several times actions.


Effect and advantage Problem
This polishing method achieves the
smoothness and brilliance by the
preferential melting effect to remove the
minute convex portion on the surface,
Since it produces clean polished surface
and create stronger passivate film,
so that the corrosion resistance
improves considerably.
As compared with such mechanical polishing
as buff polishing, this electrolytic polishing
is less recommendable to be applied to
the products having big unevenness, or
roughness or to remove large burrs
from surface.
Also, this method may suffer from bringing
about white cloud or less uniformity,
when the electric currency runs unstable.
In order to achieve the desired smoothness
and brilliance, you are recommended to
firstly have the pre-smooth surface by
buff polishing in advance and give the
electrolytic polishing to have the
desired final finish.
By the merit of melting the surface,
it creates cleanliness, and smoothness
and brilliance by the effect of removing
minute unevenness.
Polishing has been done by the melting
power of treatment solvent without
electric currency run,it is most likely
to cause less uniformity and is easily
complying with complicated shapes of
the products.
Solvent management
(e.g. solvent replacement and waste solvent
liquid) becomes necessary, because there
occurs irregularity in the solvent pattern
to be caused by the changes of treatment
solvent which happens along with the
proceeding of the treatment in which
iron and nickel chrome dissolves that
smoothness and brilliance are created by
the melting power of treatment solvent.
This method can make rough or uneven
surface to brilliant, even surface and
can remove large burr brought about from
the cutting of press processing.
Since this method cannot remove all
whetstone grains, buff debris, oil or
compound from the surface, those
whetstone grains or metal debris embedded
in the surface that are hard to be
removed them all by this method, become the
cause of the corrosion.
Also, the processed finish by this method
would not be acceptable to the places where
cleanness is strictly demanded, because
minute unevenness and grinding streaks
remained on the surface are likely to
becomes the cause to stick the contaminant.

As for the most desirable process to achieve the smooth and clean surface are as follows,

  • ■Remove conspicuous unevenness and undulation with buff polishing
  •      ↓
  • ■Electrolytic polishing and chemical polishing will do the followings,
  • ○Remove the fine unevenness,
  • ○Recover the property of stainless reduced by preliminary processing,
  • ○Remove the impurities (cleaning),
  • ○Corrosion resistance improvement.

Is regarded as most desirable.