Stainless steel is available in a number of finishes utilised in combination with post production cleaning and polishing processes.
STAINLESS STEEL MATERIAL FINISHES
Material finishes utilised in the manufacture of products by Component Developments include:
2B Cold rolled, heat treated, pickled and skin passed Dull finish.
2R Cold rolled and bright annealed Highly reflective, mirror finish.
2J Polished and brushed finish Satin, grained finish.
POST PRODUCTION FINISHING PROCESSES
Pickling is carried out by immersion in a mixture of Hydrofluoric and
Nitric Acids after the items have been thoroughly cleaned and degreased.
Following pickling the loosened contamination is removed by water
washing. Any carbon steel impregnation from fabrication methods such
as rolling, machining and pressing is then also removed. For items too
large to immerse, spray pickling is then employed and pastes are utilised
for localised application.
After pickling, a clean Stainless Steel surface is produced on which the
passive layer can reform in time. This can be accelerated by treatment
with an oxidising medium such as Nitric Acid, this procedure is known
as passivation. Following processing all the items are once again
thoroughly washed with clean water.
Electropolishing is the electrochemical removal of a metal surface where
the part being treated is connected to the positive pole of a D.C. power
source, whilst being immersed in a suitable electrolyte.
Operating anodically it is basically the reverse of electropolishing. Metal
removal takes place preferentially at peaks of the surface profile resulting
in a smoothing and de-burring of the micro-profile whilst the macro shape
of the surface is not altered. This smoothing generally produces a bright
Removing surface contaminants the process then micro-smoothes the
surface, producing an excellent passive surface and thereby enhancing the
corrosion resistance. Other advantages offered by electropolishing include
reduced total surface area, surface cleanliness, ease of cleaning, reduced
friction and de-burring.