الفهرس 
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Abstract
Corrosion is the destructive attack of a metal or alloy by chemical or elrctrochemical reaction with its environmental the importance of corrosion studies is three fold the first area of signific ance is economic including the objective of reducing material losses resulting from the corrosion of piping tanks metal components of machines ships bridges marine structures etc the second area is improved safety of operating equipment which through corrosion may fail with catastrophic.