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Coatings - Types and Characteristics
Edward Brunet, Jr., P.E.
Overview
Simply stated, a coating consists of a film-forming
material dissolved in a solvent. The film-forming material is called a
resin. When the resin contains pigments it is called a binder because it
binds the pigment particles together and to the substrate over which it has been
applied. Pigments are used to add color to the coating and can also
enhance the coating's resistance to heat, abrasion and acid. The solvent
is present in the coating to make it liquid for ease of application. After
application, the solvent evaporates and the binder remains behind.
The chemicals selected to be
used for the resin, pigment and solvent influence the properties of the coating
in the can, as well as the properties during application and curing. Most
importantly, the selection of resin, pigment and solvent will influence how well
the coating performs in its intended service environment. For example coal
tar resins have excellent moisture-resistance, but poor UV light resistance.
Hybrid resins have been formulated to improve the overall performance of resins.
In the example of coal tar, it is often combined with an epoxy resin to form
coal tar epoxy, which has improved UV resistance relative to an unmodified coal
tar resin.
Environmental regulations and
safety concerns have had a large influence on the coatings industry in recent
years. Legislation limiting the amount of volatile organic compounds (VOC's)
in paint has required coating manufacturers to reformulate their coatings to
meet environmental regulations. Additionally, the safety concerns
associate with such toxic materials as lead and chromate has continuously
challenged manufacturers to formulate high-performance coatings using
alternative materials.
In this course, the student will study the
types and characteristics of commercial coatings. The course will cover Chapter
4, "Coating Types and Characteristics" in
the US Army Corps of Engineers document EM 1110-2-3400, "Painting: New
Construction and Maintenance".
The student must take a multiple-choice quiz consisting of
twenty questions at the end of
this course to obtain PDH credits.
Specific Knowledge or Skill Attained
This course teaches the following specific knowledge and
skills:
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Basic components of a
coating system including the resin, pigment and solvent.
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Types of resins, including
vinyl, acrylic, epoxy, phenolic and urethane.
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Function of drying oils
and the relative merits of each type.
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Purpose of pigments and
the various types including inhibitive, sacrificial, hiding, color and
extender
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Different types of
solvents and their relative merits.
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The function and types of
miscellaneous additives, such as antiskinning agents, fungicides, emulsion
aids and flow agents.
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Types of zinc-rich
coatings and their relative merits.
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The impact of VOC's on
coating manufacture and selection.
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Types and applications for
powder coatings and thermal-spray coatings.
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Description of galvanizing
and its advantages/disadvantages in various applications.
Course
Click on the following PDF attachment and review
Chapter 4, "Coating Types and Characteristics" in
the US Army Corps of Engineers document EM 1110-2-3400, "Painting: New
Construction and Maintenance" prior to taking a quiz for credit.
"Coating
Types and Characteristics" (118 KB)
Having Trouble Downloading the PDF File?
Right click on the link. Select "Save Target As..."
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Click on the link below to download a free copy of Acrobat Reader.
To obtain PDH credits for this course, you will need to take a quiz for
credit. Click on the link below.
(To take the quiz,
your web browser must be set to accept cookies. See how to
check your cookie settings.)
 
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Related Books
Corrosion and Scale Handbook
Fundamentals of
Electrochemical Corrosion
Handbook of Corrosion
Engineering
NACE Corrosion Engineer's
Reference Book (3rd Edition)
Uhlig's Corrosion Handbook
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