TYPE OF BOILER FEED WATER CORROSION:
*Galvanic corrosion
*Fretting corrosion
*Petting corrosion
*Caustric corrosion
*Scale formation
*External corrosion
*Electric chemical corrosion
High-temperature corrosion
High-temperature corrosion is chemical
deterioration of a material (typically a metal) as a result of heating. This
non-galvanic form of corrosion can occur when a metal is subjected to a hot
atmosphere containing oxygen, sulfur or other compounds capable of oxidizing the
material concerned. For example, materials used in aerospace, power generation
and even in car engines have to resist sustained periods at high temperature in
which they may be exposed to an atmosphere containing potentially highly
corrosive products of combustion.
The
products of high-temperature corrosion can potentially be turned to the
advantage of the engineer. The formation of oxides on stainless steels, for
example, can provide a protective layer preventing further atmospheric attack,
allowing for a material to be used for sustained periods at both room and high
temperatures in hostile conditions. Such high-temperature corrosion products,
in the form of prevent or reduce wear during high-temperature
sliding contact of metallic (or metallic and ceramic) surfaces.
No comments:
Post a Comment