what is corrosion ?
Written on 15.10 by Dimas Sugeng Rachmadi
Derivation of the Name
The word corrosion is derived from the latin word “corrodere” that means to gone away or to wear away.
Technical Definition
Corrosion is the degradation of material that occurs when it reacts with environment
Degradative Processes
1 Electrochemical reaction
2 Oxidation reaction
3 Wear
4 Fracture
Environment
Atmsopheric environment
Aqueous environment
Preventing Economic Losses
Corrosion associated losses in Singapore is of the tune of 2 billion dollars ( 4 % of the gross national product in the advanced countries)
Preventing The loss of Natural Resources
Metals and alloys lost by corrosion process can not be reclaimed since they get distribution everywhere.
For Maintaining the Sanity of Environment
1. The leak in oil tanks can for example be very hazardous for health.
2. Underground water mains
3. Gas leak in Bhoval
4. 1986 Chernobyl disaster
Improving Health Care
Body implants
Metallic pipes carrying potable water
Safety consideration
Technology
1. Electronic equipments
2. Offshore oil platforms
3. Nuclear power plants
Aerospace application : high temperature and wear resistance towards corrosion.
Automobiles sector : resistance towards various types of wet corrosion.
Is corrosion always harmful ?
Corrosion can also be used to derive some beneficial effects such as
Pickling of steel
Storage of electrical energy in dry cells
Anodizing of aluminium
Passivation
Etching
Chemical machining
