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immersion
plating
Depositing a metallic coating on a metal immersed in a
liquid solution, without the aid of an external electric current. Also
called dip plating.
immunity
A state of resistance to corrosion or anodic
dissolution of a metal caused by thermodynamic stability of the metal.
impingement
corrosion
A form of erosion-corrosion generally
associated with the local impingement of a high-velocity. Flowing fluid
against a solid surface.
impressed
current
Direct current supplied by a device employing a power
source external to the electrode system of a cathodic protection
installation.
inclusions
Particles of foreign material in a metallic matrix.
The particles are usually compounds (such as oxides, sulfides, or
silicates), but may be of any substance that is foreign to (and essentially
insoluble in) the matrix.
incubation
period
A period prior to the detection of corrosion while the
metal is in contact with a corrodent.
industrial
atmosphere
An atmosphere in an area of heavy industry with soot,
fly ash, and sulfur compounds as the principal constituents.
inert
anode
An anode that is insoluble in the electrolyte
under the conditions prevailing in the electrolysis.
inhibitor
A chemical substance or combination of substances
that, when present in the environment, prevents or reduces corrosion
without significant reaction with the components of the environment.
inorganic
Being or composed of matter other than hydrocarbons
and their derivatives, or matter that is not of plant or animal origin.
Contrast with organic.
inorganic
zinc-rich paint
Coating containing a zinc powder pigment in an inorganic
vehicle.
intensiostatic
See galvanostatic.
intercrystalline
corrosion
See intergranular corrosion.
intercrystalline
cracking
See intergranular cracking.
interdendritic
corrosion
Corrosive attack that progresses preferentially along
interdendritic paths. This type of attack results from local differences in
composition, such as coring commonly encountered in alloy castings.
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intergranular
Between crystals or grains. Also called
intercrystalline. Contrast with transgranular.
intergranular
corrosion
Corrosion occurring preferentially at grain
boundaries, usually with slight or negligible attack on the adjacent
grains. Also called intercrystalline corrosion.
intergranular
cracking
Cracking or fracturing that occurs between the grains
or crystals in a polycrystalline aggregate. Also called intercrystalline
cracking. Contrast with transgranular cracking.
intergranular
fracture
Brittle fracture of a metal in which the fracture is
between the grains, or crystals, that form the metal. Also called
intercrystalline fracture. Contrast with transgranular fracture.
intergranular
stress-corrosion cracking (IGSCC)
Stress-corrosion cracking in which the cracking occurs
along grain boundaries.
intermediate
electrode
Same as bipolar electrode.
internal
oxidation
The formation of isolated particles of corrosion
products beneath the metal surface. This occurs as the result of
preferential oxidation of certain alloy constituents by inward diffusion of
oxygen, nitrogen, sulfur, and so forth.
intumescence
The swelling or bubbling of a coating usually because
of heating (term currently used in space and fire protection applications).
ion
An atom, or group of atoms, that has gained or lost
one or more outer electrons and thus carries an electric charge. Positive
ions, or cations, are deficient in outer electrons. Negative ions,
or anions, have an excess of outer electrons.
Ion
Erosion
Deterioration of material caused by ion impact.
ion
exchange
The reversible interchange of ions between a liquid
and solid, with no substantial structural changes in the solid.
iron
rot
Deterioration of wood in contact with iron-based
alloys.
isocorrosion
diagram
A graph or chart that shows constant corrosion
behavior with changing solution (environment) composition and temperature.
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