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the electrochemical deterioration of a material or its properties due to its chemical reaction with the surrounding environment.
Corrosion
The smallest unit of an element made up of a positively charged nucleus surrounded by a system of negatively charged electrons
Atom
a negatively charged subatomic particle
Electron
an atom or group of atoms or molecules which has acquired a net electric charge by gaining (negative ion) or losing (positive ion) electrons
Ion
a liquid (usually water) solution containing ions.
Electrolyte
all metals will corrode to some extent in a natural environment.
Theory of corrosion
Four conditions must exist before metal corosion can occur
a metal which can corrode, dissimilar conductive material, conductive liquid, and electrical contact.
Most common type of corrosion ( results from a direct chemical attack on a metal surface that proceeds uniformly over the entire exposed surface.
Uniform surface corrosion
occurs when different metals are in contact with each other and an electrolyte, such as sea water. (high build up of corrosion deposits at he joint between the metals)
Galvanic Corrosion
a form of extremely localized attack that results in holes in the metal. ( first noticeable as white or gray powdery deposits, similar to dust, white blotches the surface when cleaned away tiny pits or holes can be seen in the surface.)
Pitting Corrosion
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