3 - Electrochemistry and Corrosion Flashcards
represents the greatest
destruction of metal on a tonnage
basis.
Uniform Corrosion
Metal deterioration that
happens in tight spaces where
a stagnant liquid gets trapped
Crevice Corrosion
Exists between two dissimilar
metals with potential difference
in a conductive solution.
Galvanic Corrosion
A highly localized form of attack that eats away at the metal,
creating small holes or cavities
Pitting Corrosion
Due to chemical
composition difference at
the grain boundaries from
the bulk of the grain.
Intergranular Corrosion
This type of corrosion
targets alloys, which are
mixtures of different metals.
Selective Leaching
The repeated impact of the particles can cause loss
of material that leads to pits, grooves, or cavities
Erosion Corrosion
Occurs when a metal is
exposed to a corrosive
environment under tensile
stress
Stress Cracking Corrosion
Can lead to various forms of
damage like embrittlement,
blistering, and cracking
Hydrogen Damage
Occurs in the presence of a
liquid containing ions
(electrolyte)
Wet Corrosion
Occurs at elevated
temperatures above 400°C
(750ºF) from gases, solid or
molten salts, or molten metals.
High- Temperature
Corrosion
The kinetics are influence by various
factors such as temperature, pH,
and presence of impurities.
Wet Corrosion
The kinetics are influenced by
factors such as diffusion rates and
electrolyte resistance.
High- Temperature
Corrosion
a generic term that
applies to high carbon-iron
alloys containing silicon.
Cast iron
Considered as the least
expensive of the engineering
metals.
Gray Cast Iron
have practically
all of the carbon in the form of
iron carbide
White Cast Iron
These are produced by hightemperature heat treatment of
white iron of proper
composition.
Malleable Cast Iron
The graphite is present as
nodules or spheroids as a
result of a special treatment of
the molten metal.
Ductile Cast Iron
The excellent corrosion resistance of
high silicon irons is due to the
formation of a passive _______
SiO2 surface
later
contains about 14.5% silicon
and 0.95% carbon.
Duriron
Composed of up to 2.14%
carbon
Steels
Contained at least 11%
chromium.
Stainless Steels
Can be hardened by heat
treatment similar to ordinary
steel.
Martensitic
Stainless Steels
Essentially nonmagnetic and
cannot be hardened by heat
treatment.
Austenitic
Stainless Steels
