Corrosion 5 Flashcards
Judicious selection of materials once
the corrosion environment has been
characterized
Material selection
Combination of two or more
metallic elements, especially to
give greater strength or resistance
to corrosion.
Alloys
is not stainless, it is not
the most corrosion-resistant material,
and it is not a specific alloy.
Stainless Steel
resists distilled sea and soft tap
water, but is attacked by strong acids,
alkalis, and acid salts
Tin
Have high strength and toughness,
corrosion resistance, and elevated
temperature properties.
Nickel & Nickel Alloys
is a group of alloys of nickel
(from 52 to 67%) and copper, with
small amounts of iron, manganese,
carbon, and silicon usually used in
handling Hydroflouric Acid.
MONEL
Weaker, softer, more resistant to
chloride ions and hydrochloric acid.
Rubber & Plastics
Excellent corrosion and hightemperature resistance
Ceramics
Show good corrosion resistance,
electric and heat conductivity, but
they are fragile
Carbon
was typically used as sewer
pipes before, but it can be attacked
by aggressive environments.
Wood
are possible cells where
moisture enters and corrosion
occurs.
Crevices
creates seamless joins,
whereas riveting leaves visible
seams
Welding
are prone to
thermogalvanic corrosion and cold
spots can enhance local
condensation, which leads to
corrosion
Superheated spots
In 1824, Sir Humphrey Davy reported that
zinc and iron could be used to prevent
the
corrosion of copper
is a system for
reducing corrosion by turning the entire
structure into the cathode of a corrosion
cell.
Cathodic protection
