ANTI
CORROSION COATING SYSTEM
►DESCRIPTION:
●
Corogard is a
two component Polyurethane based protective coating system with a unique
organometallic ingredient. It is specially designed to protect a wide
range of substrates from grease, acids, alkalis, coolants and other
chemicals.
●
Corogard's
excellent adhesion and unmatched scratch and corrosion resistance makes it
ideally suited for protecting machinery and equipment in chemical,
plastic, textile, cement and marine industries. It also protects steel
reinforcement rods, metal pipes and tubes and aluminium extrusions.
●
Environmental
pollution due to nitrates and sulphates from vehicular emission has a
highly corrosive effect on steel and concrete structures. This is further
compounded by sodium chloride in the air especially in coastal regions.
Corogard can effectively guard against such factors and prevent premature
collapse of RCC structures such as buildings, flyovers, bridges, water
tanks, etc.
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COATING SYSTEM
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►SALIENT
FEATURES:
●
Outstanding
Corrosion Resistance
It
is resistant to various substances as illustrated in Table 1.
●
Excellent
Adhesion
Corogard
strongly bonds to steel, aluminium, copper, brass, concrete, FRP and wood
and will not peel off from the substrate even in severe environment.
●
Excellent
Scratch and Abrasion Resistance
It
withstands a high level of physical wear and tear as shown in Table 2.
●
Good
Elasticity
Corogard
is very elastic and withstands expansion and contraction of the substrate
without cracking.
●
Excellent
Ultraviolet Resistance
Corogard
easily withstands ultraviolet rays when exposed to sunlight.
●
Excellent
Antifungal Properties
Corogard
is highly resistant to fungal and microbial attack.
●
Good
Temperature Resistance
Corogard
can withstand variations in temperature from - 25°C to 130°C.
●
Good
Aesthetics
It
comes in a wide range of colours and with a choice of glossy or matt
finish. It can also be provided with an aluminized (silver) or Coal Tar
(black) topcoat.
►USES:
●
Chemical
& Fertilizer Plants
Protective
coatings for vessels, tanks, pumps, pipelines and other process equipment,
prilling towers and drainage lines.
●
Refineries
Storage
tanks, columns, condensers, vessels, pipelines, tankers, etc.
●
Thermal
Power Plants, Concrete Buildings & Bridges
Protective
coatings for reinforcement rods, concrete surfaces and cement plastered
facades.
●
Marine
Industry
Off
shore oil drilling rigs, marine installations, ships and boats.
●
Machinery
Protection
Plastics,
Rubber, Textile and Printing Machinery, heavy machinery, cranes, earth
moving equipment, cement mixers, tractors, etc.
●
Paper
& Sugar Industry
Concrete
tanks used for storage of paper pulp, molasses tanks and steel structures.
●
Electroplating Plants
●
Metal
Furniture & Equipment
●
T.V
& Microwave Transmission Towers
●
Under
- Carriages of Cars and Railway Coaches
●
Concrete
Industrial Floors
●
Wooden
Furniture and Articles
Waterproof
and scratch resistant decorative coatings.
●
Brass,
Bronze And Copper Articles
Transparent
protective coatings to preserve aesthetics.
●
Aluminium
Window and Door Sections
Ideal
substitute for power coating.
►APPLICATIONS:
APPLICATION
ON METALS
SURFACE
PREPARATION: The surface is cleaned of oil, dirt and grease by means
of solvents or emulsifiers. Rust and scales are removed by mechanical
means like scrapping, wire brushing and rubbing with emery paper. Sand or
grit blasting is used wherever possible to obtain a completely clean
surface. Chemical methods using phosphating chemicals, rust convertors,
etc. may also be used. Immediately after cleaning the surface a primer
coat is applied.
PRIMER
COAT: The primer coat which
protects the substrate is available in a choice of anticorrosive pigments
such as zinc phosphate, zinc chromate and red oxide. For highly corrosive
environment a zinc rich primer is recommended. Corogard 10 and Corogard 40
are mixed thoroughly and applied evenly by brush or spray. Details of the
primer coat are given in Table 3.
TOPCOAT:
The primer coat is allowed to dry for 2-3 hours. Two topcoats are then
applied over it keeping a gap of 2-3 hours between the coats. Details of
the matt, glossy or coal tar modified (for underground structures) topcoat
finishes are given in Table 3.
APPLICATION
ON CONCRETE
Dirt
and grease deposits are removed from the concrete surface by wire brushing
and solvent/detergent cleaning. An acid wash using 5-10% hydrochloric acid
is then given followed by thorough washing with large quantities of water.
The surface is allowed to dry thoroughly. Small cracks and depressions in
the concrete surface are filled up with a paste made by adding silica or
talc to a mixture of Corogard 10 and Corogard 30. Three coats of Corogard
mixture (glossy or matt) are applied by brush or spray, keeping a gap of
2-3 hours in between coats. Details of these coats are given in Table 3.
APPLICATION
ON F.R.P. AND WOOD
The
surface is thoroughly cleaned and leveled with compatible leveling
compound or with a putty made by adding silica or talc to a mixture of
Corogard 10 and Corogard 30. Smoothen the surface with emery paper. Two or
three coats of Corogard mixture (glossy or matt) are applied by brush or
spray keeping a gap of 2-3 hours in between coats. Details of these coats
are given in Table 1.
Table
1
Note:
Use Corogard 10G in place of Corogard 10 for outdoor applications.
TYPE
OF COAT |
COROGARD
COMPONENTS TO BE USED |
MIXING
RATIO BY WEIGHT |
COLOUR |
Primer
Coat |
Corogard
10:Corogard 40 |
1:4 |
Zinc
chromate-greenish yellow. |
Transparent
Topcoat |
Corogard
10:Corogard 20 |
1:4 |
Clear,
water like |
Coloured
Topcoat (matt) |
Corogard
10:Corogard 30 |
1:4 |
Wide
range of colour shades |
Coloured
Topcoat (glossy) |
Corogard
10:Corogard 50 |
1:4 |
Wide
range of colour shades |
Aluminized
Top coat (reflective)
|
Corogard
10:Corogard 30AL
|
1:4
|
Silvery
|
Coat
Tar modified Topcoat |
Corogard
10:Corogard 30CT |
1:4 |
B
lack |
►PROPERTIES:
CHEMICAL
PROPERTIES
Test
results obtained by immersing steel panels coated with Corogard in
chemical for 7/14 days (Test carried out by Dept. of Chemical Technology.
University of Bombay).
Table
2 |
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CHEMICALS |
OBSERVATION |
|
|
Hydrochloric
Acid (15%) |
No
effect was observed |
Sulphuric
Acid (30%) |
No
effect was observed |
Phosphoric
Acid (30%) |
No
effect was observed |
Nitric
Acid (5%) |
No.
effect was observed |
Acetic
Acid (10%) |
No
effect was observed |
Sodium
Hydroxide (30%) |
No
effect was observed |
Xylene |
No
effect was observed |
SeaWater |
No
effect was observed |
Petrol |
No
effect was observed |
Gear
Oil |
No
effect was observed |
Lubricating
Oil |
No
effect was observed |
Urea
(15% Solution) |
No
effect was observed |
Kerosene |
No
effect was observed |
PHYSICAL
PROPERTIES
Table
3 |
|
|
Colour |
Wide
range of colours |
Mixing
ratio |
1:4
by weight |
Pot
Life |
3-4
hours at 25ºC |
Touch
Dry Time |
10
minutes at 25ºC |
Hard
Dry Time |
3
- 4 hours |
Full
Curing Period |
3
- 4 days |
Coverage |
100
sq.ft/kg/coat |
Dry
film Thickness |
30
- 40 microns/coat |
Scratch
Hardness |
Above
3000 gm |
Temperature
Range |
-25ºC
to 130ºC |
Adhesion
|
Excellent
on mild steel concrete, wood and FRP |
Abrasion
Resistance |
0.08gm/1000
cycles at 1 kg load |
Shelf
Life |
6
months |
Packing
Size |
1/4
kg, 1/2 kg, 1 kg, 4 kg, and 20 kg. |
►STORAGE
& PRECAUTIONS:
Corogard
should be stored in a cool and dry area. It can be stored for 6 months in
its original, unopened container. Material from tin cans should be
completely used up immediately after opening the can. Metal drums should
be re-closed immediately after use. Corogard may cause irritation to eyes,
skin and mucous membrane, and is harmful if swallowed. While handling, all
contact with eyes, skin and clothes should be avoided. Implements used for
application of Corogard should be cleaned with Xylene or Toluene.
Corogard formulations are subject to strict quality control, innovations
and improvements to comply with our high standards.
The
above information is given on the basis of our best knowledge and
information and is for your guidance only. Specifications, however, are
subject to change and no guarantee is given or implied.
All
Rights Reserved. 1980 - 2015
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