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28 Cards in this Set

  • Front
  • Back
define corrosion
the chemical or
electrochemical deterioration of a material
why does corrosion occur?
because
of the tendency of metals to return to their naturally
occurring state
can Corrosion
occur in the absence of water?
yes, but only at high
temperatures, such as those found in gas turbine
engines.
what is the most common type of corrosion
electrochemical corrosion
what is The smallest unit of an element
an atom
__________ is A negatively charged subatomic
particle
electron
_________ is An atom or group of atoms or molecules
which has acquired a net electric charge by gaining
or losing electrons
ION
_____ is A liquid (usually water) solution
containing ions
ELECTROLYTE
the THEORY OF CORROSION is...
All metals will corrode
to some extent in a natural environment
what Four conditions must
exist before metal corrosion can occur
1. metal present
2. the cathode must be present
3. electrolyte must connect the
anode and cathode
4. Electrical contact between the anode and cathode must
exist
what are The metals most commonly used in aircraft
construction
aluminum, steel, titanium, and
magnesium
_____ results from a direct chemical attack on a
metal surface that proceeds uniformly over the entire
exposed surface
UNIFORM SURFACE CORROSION
______ occurs when different metals are in contact with each
other and an electrolyte
GALVANIC CORROSION
GALVANIC CORROSION is usually
recognizable by
the presence of a buildup of corrosion
deposits at the joint between the metals
____ is a form of
extremely localized attack that results in holes in the
metal
PITTING CORROSION
Pitting is usually first noticeable as...
a white or
gray powdery deposit, similar to dust, which blotches
the surface
______ is an attack on the grain
boundaries of the metal.
INTERGRANULAR CORROSION
_____ is where the surface grains of a
metal are lifted up by the force of expanding corrosion
products occurring at the grain boundaries
EXFOLIATION CORROSION
what is visible evidence of exfoliation corrosion
lifting up or swelling
_____ is recognized by its characteristic wormlike
trace of corrosion products beneath the coating
FILIFORM CORROSION
____ is
the increase in the rate of attack on a metal due to the
action of a corrosive fluid against the metal surface
Erosion corrosion
Erosion corrosion is
characterized by...
grooves, gullies, waves, rounded holes
and/or valleys in the metal surface
____is the intergranular or transgranular
cracking of a metal caused by the combined effects of
constant tensile stress
STRESS CORROSION
Stress corrosion appears in the form of...
cracks
____ is the cracking of metals caused by the combined effects of cyclic stress and corrosion
CORROSION FATIGUE
___occurs at contact areas between materials under load
subject to repeated vibration
FRETTING CORROSION
Fretting has the general appearance of....
galling, in which chunks of metal are torn from the
surface with corrosion at the torn areas or ragged pits
The corrosion
products of _____are white powdery snow-like mounds
MAGNESIUM