Corrosion destroys metallic material fabricated
structures with the time, we do not have exact treatment for it. Only thing
that we can do is minimizing the corrosion. If it is not protected by using
anti-corrosion technique, corrosion becomes worst enemy for metallic material structure.
So engineers have huge responsibility to overcome corrosion. To do that there
are lot of techniques, one of them is applying anti- corrosive paint on the
surface of the metallic material structure. It is the most common method used
in the paints and coating industries around the world. This anti-corrosive
paints allow material to withstand maximum lifespan. Almost all the industries
are being used anti corrosive paintings for various type of situations. Main
industries that use anti corrosive paints can be pointed
out by using below mentioned figure.
Figure No 01 : Places where Anti corrosive Paints
are being Used
It
is very important to select suitable protection technique for applications. It
is a big responsibility that should be done by engineers. When considering
anti-corrosive painting, there are lot of things to be considered. Those things
can be mentioned as following.
- Material selecting (There are types of materials such as metallic coating and nonmetallic coating materials. Those two type have lot of coating types which have various characteristics, so it should be selected correct coating type by considering environmental impact and applications details. )
- Surface preparation (Surface should be cleaned properly. Oil, dust and other impurities can cause to fail the coating)
- Coating thickness ( Number of coating and thickness causes to have better protection against corrosion)
Procedure
of applying anti-corrosive paint is very important to be considered. Main steps
that must be done during a painting process can be mentioned as following.
- Surface Cleaning and Conditioning
- Solvent Cleaning
- Drying
- Applying Paints ( This can be done by applying more than one coating)
Although
there are lot of classifications for anti-corrosive coatings, A wide variety of anti-corrosion coatings that are available to match the performance requirements
of a specific application can be mentioned as following.
Fluoropolymer - Resin/Lubricant Blends that Offer
Excellent Corrosion Protection
Xylan - A Fluoropolymer that Can Extend
Component Life
Molybdenum
Disulfide - Friction Protection for High Pressure
Loads
Epoxy,
air dry - Cost-Effective,
Corrosion Resistant Coating
Epoxy,
thermal cure - Excellent Impact Resistance, Plus
Corrosion and Abrasion Resistance
Phenolic - Ideal in Low PH, High Temperature
Environments
Phosphate - Ferrous Metal Coating for Anti
Galling And Minor Corrosion Resistance
Polyurethane -High Gloss Topcoat for Epoxy And Inorganic
Zinc
Inorganic
Zinc - Corrosion and Weathering
Protection for Steel
PTFE - The Original Non-Stick Coating,
Able To Withstand High Temperatures
PPS/Ryton - Thin Film Chemical Resistant Coating
FEP - PTFE characteristics with
better abrasion resistance
PVDF/Dykor - High Quality Coating Ideal For Chemical
Processing Applications
ECTFE/Halar - Resistant
to Most Chemicals Plus High Impact Strength
References
- The Infection, Maintenance and Application of Marine Coating System, 3rd Edition 2007, American Bureau of Shipping.
- http://www.metcoat.com/corrosion-resistant-coatings.htm
- http://www.corrosionpedia.com/2/1402/prevention/coatings/anti-corrosion-coatings-for-different-service-exposures
