Polikim Metal Finishing Company
currently provides the following services:
Zinc plating involves the electrolytic
application of zinc by immersing clean steel parts in a zinc salt
solution and applying an electric current. The low cost, protective
quality and attractive look of zinc makes it a very popular finish
for fasteners, metal stampings, computer enclosures, automotive
parts and many other items. Blue, Yellow and Black Passivation
Zinc-Cobalt Alloy Plating:
Zinc-Cobalt is one of the alloy
plating processes that have been developed recently to replace cadmium
and to provide enhanced corrosion resistance. It has greater corrosion
resistance than zinc. Zinc-Cobalt like zinc can
be combined with chromates and sealers to increase corrosion resistance
and improve the appearance. There are clear, yellow and black chromate
conversion coatings available for the cobalt alloys.
The cobalt alloys appear to obtain their increased corrosion protection
from a modification of the physical properties of the chromate conversion
Zinc and Manganese Phosphate Plating:
Zinc Phosphate has a large crystalline
structure. The large crystal is an excellent medium for holding
oil and adhering to paint. The phosphate also improves lubricity.
Appearance is gray.
Manganese Phosphate Plating is
used primarily on friction and bearing surfaces to prevent metal-to-metal
contact and reduce wear. This coating is also used as a base for
dry film lubricants. The crystal is smaller and smoother than zinc
phosphate. Appearance is black.
Copper is most commonly used as
an underplate or strike because of its excellent adhesion and ductility.
Nickel Plating is a yellowish
white, hard reflective finish used for wear resistance, solderability,
or dimensional restoration. Nickel plate is often applied over copper
and under chromium for a decorative finish.
Chromate coatings are chemical
conversion coatings. The substrate metal participates in the coating
reaction and becomes a component of the coating. The collaboration
has a profound effect on the properties of the coating.
Brass plating primarily is a decorative
finish. Special preparations are usually not required for plating
on most metals. Brass plates very well over zincated aluminum and
may be used as a base for nickel plating.
Tin is a soft ductile metal that
is white in appearance. The deposit can be a bright finish or matte
finish. It has great solderability and lubricity properties along
with being non-toxic. Bearing surfaces and preventing corrosion
in food containers are some applications of tin plating.
Electroless Nickel Plating:
Electroless Nickel is different
from most plating, because the process requires no electricity.
It is an auto-catalytic chemical reduction coating. This coating
can vary in hardness and corrosion resistance, it will deposit uniformly
over the entire part, and has a wide variety of uses.
It can be zinc-iron alloy plating
or nickel-iron plating. An advantage is that iron entering the plating
solution through chemical dissolution of steel substrates, which
is highly detrimental in straight nickel plating solutions, is readily
dissolved and subsequently plated out.
General surface improvement, brushed finishes,
providing matte finishes, surface preparation for plating.