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Corrosion is the gradual destruction of materials by chemical reaction with their environment. It means electrochemical oxidation of metals in reaction with an oxidant such as oxygen. Rusting, the formation of iron oxides is a well-known example of electrochemical corrosion. Corrosion degrades the useful properties of materials and structures including strength, appearance and permeability to liquids and gases.Many structures corrode merely from exposure to moisture in air but the process can be strongly affected by exposure to certain substances. Corrosion can be concentrated locally to form a pit or crack or can extend across a wide area more or less uniformly corroding the surface. Corrosion occurs on exposed surfaces and hence methods such as passivation and chromate conversion reduces the activity of the exposed surface and therefore increase a materials corrosion resistance.

Galvanic corrosionGalvanic corrosion occurs when two different metals have physical or electrical contact with each other and immersed in a common electrolyte. The anode (more active metal) will corrode at an accelerated rate whereas the cathode (more noble metal) corrodes at a retarded rate. Sacrificial anodes such as zinc is commonly used for steel structures. Galvanic corrosion is of major interest to marine industry and any situation where water - (containing salts) contacts structures.http://en.wikipedia.org/wiki/Corrosion

(Many technical terms are defined in the website)Corrosion can be defined as the destruction or deterioration of a material through reaction with its environment. The term can refer to both the process or the damage caused the process.The closer the metals are to each other in the galvanic series, the less galvanic corrosion will occur when the two materials are used in combination.http://www.corrosion.com.au/Publications/Technical-Resources

Corrosion is defined as the destructive and unintentional degradation of a material caused by its environment. The corroded state of a metal is the more stable state. Iron oxide is actually more stable than pure iron or steel and therefore rusting is very common. Prevention of rust is actually a means of retaining a less stable, or higher energy state.The economic costs of corrosion are extremely high, with large amounts spent on prevention of corrosion and replacement of corroded materials.http://www.materials.unsw.edu.au/tutorials/online-tutorials/1-what-corrosion

Corrosion is a natural occurrence that attacks metal by chemical or electrochemical action and converts it back to a metallic compound. Corrosion occurs because of its tendency to return to their natural state. Four conditions must exist before electrochemical corrosion can occur.1. A metal subject to corrosion (Anode)2. A dissimilar conductive material (Cathode which has less tendency to corrode)3. Presence of a continuous, conductive liquid path (Electrolyte)4. Electrical contact between anode and cathode (usually in the form of metal-to-metal contact such as rivets, bolts and corrosion)[LOTS OF INFORMATION]http://www.faa.gov/documentLibrary/media/Advisory_Circular/Chapter_06.pdf

General, known, taught5. Can be stopped by mechanical means.6. Environment affects corrosion rate.7. Welding weakens connection area.