engineering quiz 1

Front

what is corrosion

Back

1) destruction or deterioration of a material because of reaction with its
environments.

Front

why does corrosion happen?

Back

metals corrode when they exist in chemically unstable environments

Front

oxidization

Back

they tend to lose electrons to oxygen (and other substances) in the air or in water. as oxygen is reduced (gains electrons), it forms an oxide with the metal.

Front

dry corrosion

Back

from exposure to oxygen in the atmosphere

metal + oxygen -> metal oxide

Front

wet corrosion

Back

from exposure to
environments with the presence of water. e.g. sea water, river water, from exposure to environments such as sea water, river water, damp atmosphere

Front

stress corrosion

Back

the combined effect of stresses set up within the metal from a variety of sources and a corrosive environment

Front

galvanised

Back

involves covering an iron surface with a thin layer of a more reactive metal.

Front

sacrificial anodes

Back

highly active metals that are used to prevent a less active material surface from corroding.

the sacrificial anode will be consumed in place of the metal it is protecting.

Front

coatings

Back

non-metal substances that are added as a protective layer to the underlying metal.