Surface preparation is the key
factor in determining the
success of a protective
coating system. The objective of
surface preparation prior to
applying a coating system is to
create proper adhesion of the
coating to the original surface. This
will occur if a suitable level of
surface cleanliness and roughness
(profile) is achieved.
There are a wide variety of
surface preparation methods
available, such as solvent
cleaning, power-tool cleaning,
dry sand blasting and so on. But,
all these conventional methods
are rarely used because they are
time consuming, not costeffective,
provide poor cleaning
results and also create
environmental pollution.
Nowadays, wet sand blasting
by high-pressure water jet pumps
have got wide acceptance in the
field of surface preparation as well
as in paint removal.
Wet sand blasting:
It is a common
procedure for removing paint and
rust from steel or other metal
surfaces.With this procedure, an
abrasive material is mixed with the
water jet to create an abrasive
spray. This abrasive spray is blasted
on the surface, which breaks away
small pieces of coating corrosion
or other undesirable substances to
create the desired white metal
finish, perfect for recoating.
Wet sand blasting is widely
used in various industries for
different applications as it offers
the following advantages vis-à-vis
other conventional methods:
�� It does not create any
environmental pollution caused by
fluttering the micro power because
of its water ingredient
�� It can remove the burrs
(projections) and scales formed on
the surface and clean the surface
without damaging the work piece
�� The surface finishing can access
a homogeneous matte finish (spot
pattern). It can contribute
significantly to the demand for
surface roughness
�� It only applies small shot blasting
effect to the surface to be finished
and improves and reinforces the
material of the work piece
�� The foreign materials after
being removed will be rinsed and
flushed out by the jet of water
�� It doesn't require any chemical
during operation
�� It doesn't affect the dimensions
of the object
�� No harsh chemicals are used
�� Environmentally friendly option
to remove burrs, flash and
....CONTD
