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TECHNOLOGICAL BREAKTHROUGH IN INDIA
PRODUCT APPROVED BY I.I.T. (BOMBAY) UNDER ASTM
- A380
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UNIQUE
FEATURES OF "VK" 'FUMELESS' PICKLING AND PASSIVATION
ON STAINLESS STEEL |
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1. VK removes built
in corrosion from stainless steel.
2. VK removes scales,
discolouration, burn spots and ferritic contamination
without wire brushing or grinding.
3. VK prevents corrosion
& restores full corrosion resistance.
4. VK removes metallic
contaminants, oxide scales, rust spots & annealing
colours.
5. VK retains mill
finish.
6. VK gives a uniform,
smooth, contamination and sterile particle free, passive
surface. |
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Before |
After |
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(On
Non-polished SS surface ) |
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IMPORTANCE OF PICKLING & PASSIVATION
STAINLESS STEEL |
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Pickling & Passivation process removes free ion contamination
left behind on the surface of the stainless steel from machining
and fabricating. These contaminants are potential corrosion
sites that result in premature corrosion and ultimately result
in deterioration of the component if not removed. In addition,
the passivation process facilitates the formation of a thin,
transparent oxide film that protects the stainless steel from
selective oxidation ( corrosion ).
The failure of stainless steel components due to corrosion
can reach catastrophic proportions. The cost in time, materials,
rectification and lost production can be tremendous. If passivation
is not carried out stainless steel can rust due to surface
free iron, and since chlorides are also often absorbed from
the atmosphere, some ferric chloride will be produced. Prolonged
contact with ferric chloride will eventually initiate pitting
and crevice corrosion on the stainless steel surface. Proper
passivation will assist in the optimal restoration of the
chrome oxide passive layer.
Any mechanical treatment damages top protective chromium oxide
layer of stainless steel components.
It damages by,
* Ferritic contamination matter.
* Structural changes in top layers of stainless steel.
* Inbuilt stress development.
* Chromium content reduction on top layer of stainless
steel.
Even high temperature applications like welding & annealing
makes surface of stainless steel discolored and oxide scally.
This makes value of stainless steel to reduce not only by
appearance but also with lower corrosion resistance due to
ferric oxide. Due to these contaminations protective layer
of chromium oxide can not form at that spot and corrosive
stain builds up on insufficiently passivated stainless steel.
Properly pickled & passivated stainless steel and welding
seams offers following qualities,
1. Smooth surface, which is metallically pure & free
from any discoloration and scale.
2. High level of corrosion resistance of the S.S. component.
3. Good appearance.
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VK
PRODUCTS |
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(A-1)
VK Jelly (Gel Form) |
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Before
and After
look of weld seam – VK Jelly applied on & near weld
seam with brush |
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VK Jelly is used to clean weld seams and surrounding
areas with brush. It is used to remove heavy scales, discolouration,
annealing colours, rust particles near weld and welding affected
area by heat. It helps to detect pinholes after welding.
VK Jelly does not
give Black or Yellow stain marks after washing with water.
VK Jelly does not necessary require separate passivation
chemical process.
Coverage / kg : Approx. 100 meters of weld seam.
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(A-2) VK Spray
(Semi - Gel Form) |
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External application
of VK Spray
with special spraying bottle |
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VK Spray is used for large surface areas with plastic
spray pump or pressurised spray bottle. It simultaneously
removes annealing colours, ferritic contamination & weld
burns. VK Spray is very safe & easy to use for cleaning
of large equipments like S.S. vessels, dryers, agitators,
dairy machinery, fermentators, internals as well as externals
of pipes by pressurised spray bottle or pump.
Coverage / kg : Approx. 40 sq. ft.
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(A-3) VK Dip
(Liquid form) |
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VK Dip is used for immersion (dipping) application
& non-reachable areas of S.S. components like internal
& external of pipes, wire rolls, internal recessed areas
of machinery etc. Heavy parts are dipped in a huge tank with
the help of a chain pully. For cleaning & descaling of
pipelines, VK Dip is circulated inside pipelines with the
help of pump.
Coverage / kg : Approx. 40 sq. ft.
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( B )
VK PASSIVATION |
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VK Passivation should be used after the application
of VK Jelly, VK Spray or VK Dip as it is a must
to passivate S.S. surface after pickling. VK Passivation products
helps in the formation of a thin passive film on Stainless
Steel surface which will protect it from further corrosion
and contamination.
There are TWO types of passivation products depending on the
end use of S.S. equipments / pipelines / parts.
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( B-1
) VK Pass-1 |
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VK Pass-1 is used for general industrial purpose S.S. equipments
& pipings to be used in industries like chemical, nuclear
, paper etc. non-hygenic industries.
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( B-2 ) VK Pass-2
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NEW PATH BREAKING CONCEPT FROM THE MAKERS OF "VK"
CHEMICALS |
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VK Pass-2
is biodegradable, non-toxic, non-hazardous
chelant passivation to be used for S.S. equipments & pipings
specially for industries like Pharmaceutical, Dairy, Food,
Beverages, Cosmetics etc.
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Benefits
of VK Pass-2 |
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1. Improved and faster removal
of free iron from the surfaces. |
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2. Optimum
corrosion resistance of process piping and equipments. |
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3. An ideal depth improvement
of the passive layer optimising chrome iron ratio
on the surfaces. |
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4. Provides a clean and
non-rusting surface. |
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5. Useful for cleaning in
pre-operational maintenance and post-operational stainless
steel process systems. |
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6. Increases corrosion resistance
when applied on pickled and electropolished surfaces. |
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7. An absolutely environmentally
safe chemistry that also offers ease of disposal in the
sewage system. |
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8. Does
not affect epoxy flooring. |
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(C) NST-100 |
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NST-100 is a sulphur free degreser for removing oil,
grease , mid rust , soil etc. NST-100 is a sulphur free degreaser
so it can be used in hygenic industries like Pharmaceutical
etc.
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The unique feature
of VK is that without damaging the parent metal it does the
function of descalement, oxide & rust removal plus
gives a passive film which avoids further corrosion.
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How
to Apply? |
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1. |
First remove oil, dirt etc. with NST 100 - Sulphur free
degreaser. Add 50 - 75 gm/lit. in water & stir to dissolve.
Wipe S.S. surface with cotton cloth or spray
or soak for 10 min. Wash with water and allow to dry.
( Steps 1 & 5 can be avoided for VK Jelly on
weld seam application ) |
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VK Jelly
is applied on weld seam & surrounding areas with
a nylon bristled plastic brush OR
VK Spray is sprayed on S.S. surface with plastic pressurised
spray bottle or pump
OR
VK Dip is used to dip S.S. comsponents in a plastic
tank or circulated in pipeline with pump.
Application Temp. = Between 25 - 35 deg. C .
If temp. is less than more time may be required and
if temp. is more than uneven processing may result.
So, cool SS equipment by keeping its in shade &
not directly under the sun.
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3. |
Keep VK
product for 10 - 45 minutes depending on contamination
& scale. ( VK Jelly generally kept for 10 - 30
min. and VK Spray generally kept for 30 - 45
min. )
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4. |
Wipe the
weld seam lightly with plastic brush or cloth &
wash with water thoroughly & allow to dry.
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5. |
Spray or
Dip in VK Pass - 1 or VK Pass - 2 solution & leave
it for 10- 20 minutes. Rinse with water thoroughly. |
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For
Passivating Mirror Bright Buffed / Polished SS Areas,
THE BELOW STEPS
WILL NOT
AFFECT SHINE OF MIRROR BRIGHT BUFFED / POLISHED SS AREAS
AND
PROVIDE CONTAMINATION & STERILE PARTICLE FREE PASSIVATED SS
SURFACE.
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1. |
First apply
VK Jelly on weld seam & surrounding areas with a nylon
bristled plastic brush. After 10 to 30 min. wipe with
cloth or plastic brush & wash with water thoroughly.
(
Application of VK Jelly ensures that black & red spots
do not come on & near weld seams area as generally
observed some days after bright buffing. )
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2. |
Complete
usual bright buffing / polishing procedure to make
surface mirror bright & shiny.
( If SS eqpt. or pipe is already bright buffed or
polished then discard Steps 1 & 2 and start directly
with Step 3 )
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3. |
Remove oil,
dirt, buffing compounds etc. with "NST 100" - sulphur
free degreaser.
Add 50 - 75 gm/lit. in water ( 1 kg NST-100 in 15 – 20
Lit. water ) & stir to dissolve. Wipe S.S. surface with
cotton cloth or pressurised spray for 2 - 5 min. or soak
small parts for 10 min. Wash with water properly.
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4. |
Spray or Dip
in VK Pass - 1 or VK Pass - 2 & leave it for 15 - 25
minutes. Then, rinse with water thoroughly.
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"NOVEL" PROVIDES EQUIPMENTS & ACCESSORIES FOR SAFE,
IN-HOUSE
PICKLING & PASSIVATION FOR ALL TYPES OF JOBS.
PRODUCT APPROVED
BY I.I.T. (BOMBAY) UNDER ASTM – A380
ASTM = American Standards of Testing Materials
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ADVANTAGES OF VK |
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1.
Controlled metal removal.
2. Very easily welding scales are removed.
3. Negligible Fuming.
4. Improved finish with uniform smooth, satin look.
5. Stops corrosion & gives full corrosion resistance to
treated surface.
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FIELD
OF APPLICATION |
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VK is effectively & widely used in the following industries
/ products. |
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Industries : |
Pharmaceuticals,
Chemicals, Dairy, Food & Beverages etc. |
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Products : |
S.S. vessels,
pressure vessels, filters, mixers, heat exchangers, pipe
lines / tubes, fermentator, agitators etc. |
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