Coatings Flashcards
applied to a surface to protect the substrate from
corrosion
COATINGS
thin layers of materials that are applied to a metal surface to
protect it from corrosion.
COATINGS
materials used in coating
polymers, ceramic, and metal alloys
TYPES OF
COATINGS
metallic and organic
made of metal applied to surface of another metal to provide protection
against corrosion
METALLIC COATING
METALLIC COATING processes
dipping, electroplating, spraying,
cementation, and diffusion
a layer that changes the surface
properties of the
metal being applied
METALLIC COATING
a layer that changes the surface
properties of the workpiece to those of the
metal being applied
METALLIC COATING
Corrosion-resistant to a wide range of chemical environments such as: the
atmosphere, ammonia, coal gas, fluorine, hydrogen peroxide, mercury, etc.
Nickel
Nickel Usually prepared by
electroplating
Nickel Plated either directly on steel or sometimes over an
intermediate coating of copper
tanks, pipings, and
valves
nickel
unique properties like corrosion
resistance, malleability, and low melting
poin
lead
Lead Usually formed by either
hot dipping or
by electrodeposition
construction
industry for applications such as
waterproofing and roofing.
Lead
enhance the corrosion resistance of iron
castings to sulfuric acid
Lead and lead-tin coatings
Excellent resistance to both atmospheric and aqueous corrosion.
Zinc
inexpensive compared to other corrosion prevention
Zinc
Zinc also called
galvanized coatings
Zinc methods
hot dipped or electroplated
other words for Electrogalvanized
electroplated zinc coating
bolts, screws, and
wire products
zinc
very specific substrate metals
(e.g., iron, aluminum, and steel)
Cadmium
Superior protection against corrosion
in alkaline and marine environments
Cadmium
methods used in cadmium
electrodeposition
More expensive than zinc, but retains
a bright metallic appearance longer,
Cadmium
in low to moderate corrosive
environment where they can provide
long-term protection
Tin
do not corrode in soft
waters.
tin
Widely used in the food packaging
industry to provide a protective
barrier
Tin
Made from various organic materials
ORGANIC COATINGS
applied to surfaces in liquid form
ORGANIC COATINGS
These coatings are based on carbon
containing materials
ORGANIC COATINGS
offer superior
resistance to abrasion,
turbulence, harsh chemicals, and
severe temperatures
Epoxy
used in metal
finishing to protect metal surfaces
from corrosion and wear
Epoxy
useful, for example, to seal
leaks temporarily in ferrous or
nonferrous piping
Epoxy
coating used for their resistance to
abrasion, chemical exposure, and
weathering
Polyester
used for their transparency, color retention,
and resistance to UV light.
Acrylic
water-resistant, making them a good
choice for applications where protection
against water and moisture
Acrylic
easy to apply, with many
formulations available in spray-on or brush-on
forms
Acrylic
polyester method
spray or electrostatic deposition
