|
lamellar
corrosion
See exfoliation corrosion.
lamellar
tearing
Occurs in the base metal adjacent to weldments due to
high through-thickness strains introduced by weld metal shrinkage in highly
restrained joints. Tearing occurs by decohesion and linking along the
working direction of the base metal; cracks usually run roughly parallel to
the fusion line and are steplike in appearance. Lamellar tearing can be
minimized by designing joints to minimize weld shrinkage stresses and joint
restraint. See also cold cracking, hot cracking, and stress-relief cracking.
Langelier
saturation index
An index calculated from total dissolved solids,
calcium concentration, total alkalinity, pH and solution temperature that
shows the tendency of a water solution to precipitate or dissolve calcium
carbonate.
ledeburite
The eutectic of the iron-carbon system, the
constituents of which are austenite and cementite. The
austenite decomposes into ferrite and cementite on cooling below the
temperature at which transformation of austenite to ferrite or ferrite plus
cementite is completed.
ligand
The molecule, ion, or group bound to the central atom
in a chelate or a coordination compound.
limiting
current density
The maximum current density that can be used to obtain
a desired electrode reaction without undue interference such as from polarization.
linear
elastic fracture mechanics
A method of fracture analysis that can determine the
stress (or load) required to induce fracture instability in a structure
containing a cracklike flaw of known size and shape. See also fracture
mechanics and stress-intensity factor.
|
|
lipophilic
Having an amenity for oil. See also hydrophilic and
hydrophobic.
liquid
metal embrittlement
Catastrophic brittle failure of a normally ductile
metal when in contact with a liquid metal and subsequently stressed in
tension.
local
action
Corrosion due to the action of "local
cells," that is, galvanic cells resulting from inhomogeneities between
adjacent areas on a metal surface exposed to an electrolyte.
local
cell
A galvanic cell resulting from inhomogeneities
between areas on a metal surface in an electrolyte. The
inhomogeneities may be of physical or chemical nature in either the metal
or its environment.
localized
corrosion
Corrosion at discrete sites, stress-corrosion
cracking.
long-line
current
Current that flows through the earth from an anodic to
a cathodic area of a continuous metallic structure. Usually used only where
the areas are separated by considerable distance and where the current
results from concentration-cell action.
luggin
probe (Luggin Haber capillary)
A small tube or capillary filled with electrolyte,
terminating close to the metal surface under study, and used to provide an ionically
conducting path without diffusion between an electrode under study
and a reference electrode.
|