2. IN THERMAL PLANTS:
DIFFERENTIAL AERATION CORROSION
Most of the electricity produced throughout the world is from
thermal energy generating plants such as fossil fuel, nuclear, hydroelectric,
geothermal, solar etc.
Thermal energy generating plants may be shut down due to planned or
unplanned maintenance or due to low seasonal power demand. During the
shutdown, corrosion can take place on all or parts where the ambient air,
which always contains certain quantity of water vapour, comes into
contact with metal surfaces of the generating plant. This is due to
ineffective corrosion awareness on the part of the engineer or design. An
overview of protective materials most often used to withstand the
aggressive environment in thermal energy generating plant such as Coal
fired power plants, Gas Turbines of various researchers should be reviewed.
3. EXAMPLES OF CORROSION IN THERMAL PLANTS:
Steam wind
pipe Smoke stack
PulverizerAir preheater
4. IN WIND MILLS:
DIFFERENTIAL AERATION CORROSION
GALVANIC CORROSION
A monopile wind turbine foundation consists of a steel
pile driven into the seabed below the water line (in case of
onshore). A transition piece is installed over the top of the monopile
. The annular space between the monopile and the transition
piece is then filled with high-strength grout that cements the two
pipes together . Thus both external and internal corrosion issues
have affected monopile foundation structures .
EXTERNAL-DIFFERENTIAL AERATION
CORROSION(onshore windmill)
INTERNAL –GALVANIC CORROSION
8. CONCRETE CORROSION:
DIFFERENTIAL AERATION CORROSION
For steel embedded in concrete , corrosion
results in the formation of rust which has two to four times the volume
of the original steel and none of its good properties . Corrosion also
produces pits or holes in the surface of reinforcing strength capacity
as a result of the reduced
cross-sectional area.
