The Chemistry of Painting Cars
It is necessary to paint cars because the paint protects the steel of
the car from corrosion, paint fills and smooths out any imperfections
in the steel surface and it provides a durable, decorative, glossy
appearance.
If rusting continually takes place the car becomes unsafe. When water
and oxygen come in contact with the metal of the car surface, several
redox reactions happen. The oxygen is reduced to hydroxide ions and
iron is oxidized to Fe2+ ions which pass into solution. More reactions
happen which ultimately produce rust - Fe2O3H2O.
The components of car paint
There are three components of car paint, each one has different roles:
* The pigment provides a barrier to protect car from atmosphere
slowing the rate of corrosion. It disguises appearance of the
steel car body, gives colour and other effects which enhance the
appearance of the car.
* The polymers in paint protect the metal from damage that may be
caused by the paint sticking to the surface. It also allows the
paint to have a continuous, unbroken film by flowing under the
effect of surface tension. This gives the car a smooth, glossy
finish.
* The solvent in paint aids the transfer of paint between the
container and the surface (when being sprayed) because the paint
polymer is dissolved in it. The solvent helps the paint flow while
it dries and then evaporates. This causes health and environmental
problems.
When painting cars three different layers of paint are applied. Each
one has a different function.
Layer
Function
Properties
Primer
...
... middle of paper ...
... * Chemical resistance (from cross-linking).
* Adhesive
* Control of flow properties.
References
Fig. 1 The structure of an epoxy resin present in primers.
Taken from "A Perfect Finish"
By Gus Palluel, Vol. 3, No.1, September 1993, Philip Allan Publishers
Fig. 2 The structure of a polymer often present in a surfacer.
Taken from "A Perfect Finish"
By Gus Palluel, Vol. 3, No.1, September 1993, Philip Allan Publishers
[1] "A Perfect Finish"
By Gus Palluel, Vol. 3, No.1, September 1993, Philip Allan Publishers
[2] "'Aquabase' Safeguard the environment - without sacrificing the
finish"
By Graham Wheeler, ICI STEAM Magazine, Issue No. 14, January 1991
[3] Salters Advanced Chemistry - Chemical Storylines
By George Burton, John Holman, Gwen Pilling and David Waddington
[4] "Bonded!"
...ist must keep his tools scrupulously clean. The brushes are dipped and wiped throughout the painting session with brush cleaner to keep from contaminating colors with residue from previous paint. Use a beater rack to remove excess thinner from brushes after cleaning them.
These include, high strength, low weight, high chemical resistance and high cut resistance. This material does not corrode or rust and is also unaffected when placed in or under water.
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?Robotics will boost quality and transfer efficiency levels.? Coatings (Jul.-Aug. 1991): 66 InfoTrac. Online. Nov. 2002. .
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