Field of the Invention:
The present invention relates to a temporary rust preventive coating composition and a
method for application of the coating on the surface of steel to prevent damage of the
steel from environmental hazards and handling during transportation and storage of
the steel.
Background of the Invention:
In steel plants, steel tubes are produced from CRCA sheets for various applications for
example, automotive, boiler and general engineering etc. For all such types of tubes, a
rust preventive guarantee for at least six months is one of the major technical delivery
conditions. The prior art practice is a post production oiling of the tubes with rust
preventive oil. Excess oil is drained out by keeping the tube bundles at an angle and
finally the oiled tubes are dispatched to the end-users. This process apart from being
very expensive also causes development of ents on the tubes due to additional
handling. To eliminate oiling of the tubes and holding at an angle, a rust preventive
coating with an application technique is developed by this disclosed invention.
Admittedly, temporary protective coatings are widely used to protect the surfaces of
various products parts, or components during manufacture, assembly, shipping,
installation, or refinishing operations. The temporary protective coatings are used to
prevent damage of the product from scratching, corrosion, sticking, or discoloration.
The protective coatings are also used to simplify or enhance cleaning operations
whereby surface contamination is eliminated by removal of temporary coatings.

US 2004/0009354A1 to Krepski et.al describes a dry strippable coating composition
which can be incorporated into a composite article and comprises dried water borne
polyurethane dispersion including a release additive consisting of a releasing co-solvent
or other selected release material. Dry stripping the coating composition from the
substrate provides a thermoformed substrate and a thermoformed protective layer. The
dry strippable coatings provide temporary protection for the surface of the various
products and components during the manufacture, assembly, shipping, installation,
painting and refinishing operations.
US 2008/0268140 Al to Akhtar et al. teach a composition of clear pigmented coating
that is temporary and removable. It is especially designed to protect the surface of an
automobile from damaging effects of the environment and also the damage caused by
daily normal use. The coating composition is of 40 to 80% of cellulose acetate butyrate
ester, 15 to 60% of an acrylic polymer and 2 to 10% of a sucrose acetate isobutyrate.
The remover is a combination of tetrahydrofurfuryl alcohol, dibasic ester, diacetone
alcohol, ethyl 3 ethoxypropionate; 2,2,4 trimethyl-1,3 pentanildiol monoisobutyrate, and
white mineral oil.
US 2010/0183901 Al to Van Ginneken et al teaches an aqueous coating composition for
forming a peelable temporary coating on a substrate, said aqueous coating
composition comprising one water based film forming polymer, characterized in that the
composition additionally comprises solid particles of amino based polymer.
Such coatings are suitable for temporary protection and/or decoration of motor vehicles
and components thereof. A new vehicle with surface paint finish is subjected to various
possible types of damages both during assembly process and during transportation
from the assembly plant to retail locations. Typical sources of damages, include acid
rain, bird droppings and rail dust, a cloud of hard, abrasive particles which rises from

rail bed as trail passes over the rails, or from the electrical pickups scraping on the
overhead power lines.
Examples of water based film forming polymers are polyurethanes, polyesters,
polycarbonates, and polymers prepared by polymerization of olefenically unsaturated
monomers, such as poly (meth)acrylates or copolymers of vinyl acetate, are known.
Prior art also shows use of mixtures and/or hybrids of these types of film forming
polymers. The solid particles of an amino based polymer are generally present in the
coating composition in an amount of at least 1, or at least 2, or even at least 4% by
weight, calculated on total weight of composition. The upper limit of the amount of the
particles suitably is 25%, or 20%, or 14% by weight, calculated on total weight of the
composition. The average particle size generally is in the range of lum to 150pm.
US Patent 5495462 to Salamon et al describes an aqueous base coating composition for
forming strippable, protective coating for protecting surfaces, such as glass, metal,
ceramic, plastic or other materials of construction. More specifically, the composition
and coatings formed therefrom of this invention are particularly useful in connection
with protecting the precision surfaces, such as optical lenses, including but not limited
to ophthalmic lenses, telescopic lenses, microscopic lenses and the like, which
protection is desirably only of a temporary nature.
US Patent 5081174 to VanBuskirk et al discloses a formable, weldable, removable
protective coating composition for use on metals, said coating comprising a combination
of a base neutralized acid functional copolymer wax lubricant, and further comprising a
removability enhancing means such as phosphoric acid as an additive to coating
composition.

International application published as WO2009004684 teaches an aqueous fluid for
treatment of zinc plated steel sheets. The composition comprises: a) ammonium
zirconium carbonate, b) tetravalent vanadium compound, c) organophosphonic acid or
its ammonium salt, d) anionic water dispersible acrylic resin and water. The solid
content of anionic water dispersible acrylic resin is 1-60 mass% based on the total solid
content of components. The steel sheet treated with aqueous fluid is excellent in
corrosion resistance, alkali resistance, appearance, condensed dew resistance, and
temporary coating.
US2002120056 to Denovus LLC describes an environmentally benign and water
dispersible corrosion inhibitor which comprises: a) water dispersible polymer(s), water
and additive(s). b) the polymer consists of vinyl acetate, vinyl acetate copolymers, vinyl
acetate emulsion, polyvinyl acetate, or polyvinyl alcohol. The invention provides an
environmentally benign and water dispersible corrosion inhibitor.
US 5292549 to Armco Inc. discloses a method of thin siloxane coating on steel plates.
The process involves: a) washing the sheet with a mixture of silane and 0.1-1.0vol.% of
cross linking agent, b) curing the silane below the decomposition temperature to form
the siloxane film, the process is useful for suppressing the white rust on metalized,
especially steel while awaiting processing or during transport to customer.
JP3115473 to Nippon Paints Co. Ltd. teaches water base anticorrosive paint for
galvanized steel which comprises: a) water soluble, water-suspendible or water
emulsifiable resin (pH of 8 to 9, from amony acrylic, vinyl ester, epoxy modified
polyester resins), b) 0.1 2 vol% pigment (from chromium pigment and a calcium
plumbate pigment) to give a water base anti corrosive paint for galvanized steel. The
invention provides temporary white rust prevention during storage or transportation of

galvanized steel products such as drinking water pipes, lightning poles, guard rails, steel
towers and steel bridges.
US 2002026882 to Henkel Corporation discloses a temporary protective coating
composition which comprises: a) water, b) 5-20% by weight polyvinyl alcohol, c)
0.05%-0.6% by weight Surfactant (perfluoroalkyl polyether non ionic surfactants,
fluoroalipahtic polymeric ester non ionic surfactants, fluoroaliphatic sulfate surfactants,
fluoroaliphatic sulfonate surfactants, amine perfluoroalkyl sulfonate surfactants,
alkoxylated phenol surfactants, and acetylenically unsaturated non surfactants), d) 0.1-
5% by weight alkanolamine, e) 0.1-5% by weight corrosion inhibitor (alkanolamines,
adducts of carboxylic acids and amines, and nitrogen containing heterocycles). It is
used to protect the surface of metals articles from corrosion and contamination during
the formation.
EP 162611 to Imperial Chemical Industries PLC provides an aqueous composition (an
addition copolymer which is dissolved or dispersed in the aqueous liquid medium in the
form of salt) for producing an alkali soluble temporary protective coating. The
copolymer contains carboxyl groups to give an acid value of 25-150 mg KOH/g and
comprises 2-20 wt % (meth)acrylamide, N-(1-8C alkyl) acrylamide, vinyl pyrollidone,
vinyl pyridine or a monomer having a polyoxyethylene chain of molecular weight 100.
The coating is applied 10-20 microns thick to give temporary protection to a surface
liable to deteriorate on exposure to the atmosphere or to be damaged by abrasion.
PL 128054 to Instytut Mechaniki Precyzyjnej provides a temporary corrosion protection
for ferrous metals containing: a) synthetic tanning agents 0.2-25, b) natural tanning
extensions (especially from oak, mimosa or quebracho) 0.2-25, c) pyrogallol, resorcinol,
hydroquinone and/or ascorbic acid 0.5-15 d) aqueous butadiene styrene copolymer,

methacrylic butadiene copolymer, and/or poly(vinylacetae) latexes containing acrylate
esters, e) optionally styrene 5-82 parts. The composition provides non toxic, non
flammable, coating composition.
JP 59059886 to Mitsubishi Heavy Ind. Ltd. provides a temporary rust preventive method
and rust preventive for iron and steel materials including tubes. The solution is
prepared by heating (>=30°C) an aqueous solution which contains: a) 0.5-3% sodium
nitrite and potassium nitrite, b) 0.5-2% sodium carbonate or potassium carbonate,
0.05-0.5% gelatin. This invention is useful to form easily a temporary rust preventive
film which is easily strippable.
JP 201181558 to Takeda Chemical Industries Ltd. provides a temporary protective
coating composition which comprises: a) a copolymer emulsion obtained by reacting a
monomer mixture comprising: (1) 1-60% wt. conjugate diene monomer (1,3-
butadiene), (2) 40-99% wt. polymerizable monomer (alkyl(meta) acrylate or an
aromatic vinyl compound of the carbon numbers 1-20 which is copolymerize with
monomer. Coating composition forms a temporary protection film excellent in adhesion
to coated plates or members even at low temperatures an removability in wide
temperature range and such as high mechanical strength that is caused no breakage
during removal.
JP 2269781 to Yushiro Chemical Industries discloses a process to manufacture water
based acrylic polymer compositions for surface protection. Aqueous protecting
composition comprises: a) copolymerizing alpha, beta-monoethylenic unsaturated acid,
b) ester if methacrylic acid in an alcohol solvent containing surface active agent and
then add volatile alkali and water at the same time while distilling out the alcohol. It is
used as primary anti corrosion of automobile, vehicles and mechanical parts.

JP 10157003 to Sumitomo Metal Ind. Ltd. discloses a steel material coated with
temporary rust preventive coating agent. The agent consists of a solvent and a resin
based preventive material. The boiling point for 60-90% by weight of solvents
contained in the agent is less than 150° Celsius. The solvent enables low temperature
hardening and self-recovering property. The coating protects the steel material from
damage during the storage and shipment until usage and also protects steel pipes
reliability for reuse.
JP 62149386 to Nippon Steel Corp. discloses a temporary rust preventive treatment of
metallic pipes. Method includes: metal tube is coated with UV curable paint after thinly
coating with alkyl or acrylic resin rust preventive. UV paint is mainly composed of acrylic
acid or methacrylic acid derivatives used for temporary rust prevention of steel. UV
irradiation energy is approximate 1000W.sec/m2 or more. The rust preventive is of a
solvent type or is water soluble or water dispersible. This method improves the
performance of UV curable paint.
JP 60197888 to Ikunaga Kastumi provides a method and a composition for temporarily
preventing rusting of steel material. A composition consists of: 0.1-20 wt% zinc powder
or mixture of zinc powder with zinc oxide powder is added to the abrasive material. A
very small amount of zinc is stuck to the surface of the steel material to prevent
temporarily the rusting of the steel material. The method is effective in temporary
prevention of rust for iron and steel materials.
JP 55038939 to Mitsubishi Heavy Ind. Ltd. provides temporary rust preventive method
for iron and steel material. Methods include: surface of the iron and steel material is
applied with a thin film of hydrogen di-ammonium citrate is prepared and heated to
about 80°C. The iron or steel material heated to about 50°C is immersed in the
solution.

Currently articles are oiled for achieving the surface protection and corrosion resistant
properties but some problems are associated with oiling process such as sticking,
slipping and cost.
US Patent 5453459 to Roberts et al discloses a composition for providing a temporary
coating to protect the surface of an article and a solvent free composition for rapidly
removing the coating from the article. The invention also includes a method for
protecting the surface of an article and a system for carrying out the process.
Accordingly, there is a need for a protective coating which can be quickly applied with
little effort, and is resistant to environmental damage, and further can be removed
easily even after an extended period.
Objects of the Invention
It is therefore an object of the invention to propose a water based anti-rust coating
applicable to steel substrates for temporary protection of steel during transit and
storage.
Another object is to a water based anti-rust coating applicable to steel substrates for
temporary protection of steel during transit and storage, which eliminates the
disadvantages of prior art oiling system for temporary rust prevention.
A still another object of the invention is to propose an anti-rust coating applicable to
steel substrates for temporary protection of steel during transit and storage, which
allows an easy application process on steel substrates.
A further object of the invention is to propose an anti-rust coating applicable to steel
substrates for temporary protection of steel during transit and storage, which is
removable from the coated surface in a simple manner.

Another object of the invention is to propose an anti-rust coating applicable to steel
substrates for temporary protection of steel during transit and storage, wherein the
steel substrate can be easily paintable even without removing the temporary coating
from the substrate surface.
SUMMARY OF THE INVENTION
Accordingly, there is provided An anti-rust coating applicable to steel substrates for
temporary protection of steel during transit and storage, consisting of a base solution
comprising a roll coolant with 3% to 8% of raw coolant, water based polymer made
with 0.5 to 4% of each silane, VTMO, AMEO & GPTMS, 0.5 to 1.0% Acetic acid and 0.25
to 1.0% Ethyl silicate as flash rust inhibitor; wherein the water-based polymer solution
is in the range of about 20% up to less than 50% by volume of the total composition,
wherein the flash rust inhibitor, ethyl silicate is in the range of about 0.1 to 1.0% by
volume of the total composition, and wherein the base solution made with roll coolant is
in the range of 50% to 80% by volume based on the total weight of the composition
BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS
Fig.-l- shows coated sample exposed in atmosphere for 3600 hours.
Fig. 2- shows uncoated sample exposed in atmolsphere for 24 hours
Fig. 3- shows EIS plots for coated and uncoated steel exposed in 3.5% NaCI solution
Fig. 40 shows tofel plots for coated and uncoated steel exposed in 3.5% NaCI.

Detail Description of the invention
The present invention provides a water based rust preventive coating which exhibits a
high corrosion-resistant property during transit and storage, and has a coating life of at
least six months. It is desirable and often necessary to protect the steel articles form
environmental damages to preserve smooth and shiny surface of the produced steel.
The inventive coating is effective in protecting the surfaces of various steel products by
reducing additional handling damage taking place in the prior art protective method of
oiling the steel surfaces post production.
The present invention provides water based effective coating composition for temporary
protection of steel surfaces. The coating composition includes: a base solution
consisting of roll coolant with 3% to 8% of raw coolant, a water based polymer made
with 0.5 to 4% of each silane: Vinyltrimethoxy silane, Amino silane & (3-
Glycidoxypropyl) methyldiethoxy silane, 0.5 to 1.0% Acetic acid and 0.1 to 1.0% Ethyl
silicate as flash rust inhibitor.
The base solution made with roll coolant is in the range of 50% to 80% by volume
based on the total weight of the composition. The polymer solution is in the range of
about 20% up to less than 50% by volume of the total composition. Ethyl Silicate is in
the range of about 0.1 to 1.0% by volume of the total composition and the coating is
easy to remove without the need of any aqueous or non aqueous washing solution.
According to the invention, the coating is mixed with roll coolant for an easy application
method i.e. spray or dip and to replace the prior art oiling of components before
shipment and storage.

The possible formulations of the composition are described in the table below. And a
known coolant has been used for the invention:

Methodology: adapted by the inventors
a) Extensive literature survey on temporary rust preventive coating.
b) Preparation of coating.
c) Application of coating on the article.
d) Characterization of coating.
e) Optimization of coating formulation.
Experimentation
a) Preparation of sample: Metal articles were cut into small dimension of
2cm2. Irregular edged and other metal fines were removed by debris
removing. Finally the samples were drilled with through hole at one end and
cleaned with jute cloth to provide dirt free metal surface for coating and
prepared 1cm2 areas for exposure by covering the rest area with the lacquer.

b) Formulation of the Coating: Temporary rust preventive coating disclosed
in the present invention comprises a base solution with roll coolant, a water
based polymery and a flash rust inhibitor, as described hereinabove, with a
pH of the coating maintained, between 9 and 11.
c) Application of the coating: Metal articles were dipped into the formulated
coating solution for predetermined dip time and were cured at room
temperature for about 48 hours. Spray method can also be applied for
coating the articles in plant.
Results
Articles coated with formulated coating according to this invention, were exposed to
Atmospheric test, Electrochemical Impedance Spectroscopy (EIS) and Tafel for
evaluation of coating performance.
a) Articles exposed to atmosphere lasted for more than 150 days without
rusting.
b) Electrochemical tests conducted on the coated articles showed that
coating composition has greater corrosion resistance and less corrosion
rate after being exposed in corrosive media.

We Claim:
1. An anti-rust coating applicable to steel substrates for temporary protection of steel
during transit and storage, consisting of:
• a base solution comprising a roll coolant with 3% to 8% of raw coolant, water
based polymer made with 0.5 to 4% of each silane, VTMO, AMEO & GPTMS, 0.5
to 1.0% Acetic acid and 0.25 to 1.0% Ethyl silicate as flash rust inhibitor;
wherein
• the water-based polymer solution is in the range of about 20% up to less than
50% by volume of the total composition, wherein
• the flash rust inhibitor, ethyl silicate is in the range of about 0.1 to 1.0% by
volume of the total composition, and wherein the base solution made with roll
coolant is in the range of 50% to 80% by volume based on the total weight of
the composition.

2. The coating composition as claimed in claim 1, wherein the coating composition
is mixed with the base solution formed of roll coolant before application on the
substrate.
3. The coating composition as claimed in claim 1, wherein the coating is applied on
the substrate in the form of a thin layer, and wherein the thickness of the coating is 4-
10 microns.

4. The coating composition as claimed in claim 1, wherein the corrosion resistance
property of the coating when coated on the substrate and heated to 100°C remains
unaltered.
5. The coating composition as claimed in claim 1, wherein the coating can be
applied on the substrate surface by means of spraying or dipping.
6. The coating composition as claimed in claim 1, wherein the coated substrate is
cured for about 48 hrs at room temperature to obtain desired corrosion resistance.
7. The coating composition as claimed in any of the preceding claims, wherein the
coating after application on the substrate can be removed merely by abrasion with a
cloth.
8. The coating composition as claimed in any of the preceding claims, wherein the
coated surface is paintable even without removing the coating.

9. The coating composition as claimed in claim 1, wherein the composition is non
inflammable
10. The coating composition as claimed in claim 1, wherein the coating composition
having pH range between 9 and 11

ABSTRACT

The invention relates to an anti-rust coating applicable to steel substrates for temporary
protection of steel during transit and storage, consisting of a base solution comprising a
roll coolant with 3% to 8% of raw coolant, water based polymer made with 0.5 to 4% of each silane, VTMO, AMEO & GPTMS, 0.5 to 1.0% Acetic acid and 0.25 to 1.0% Ethyl silicate as flash rust inhibitor; wherein the water-based polymer solution is in the range of about 20% up to less than 50% by volume of the total composition, wherein the flash rust inhibitor, ethyl silicate is in the range of about 0.1 to 1.0% by volume of the total composition, and wherein the base solution made with roll coolant is in the range
of 50% to 80% by volume based on the total weight of the composition.