CORROSION
A major consideration in engineering design is maintenance. One of the commonest causes of failure in the long term is corrosion. This is any deterioration in the component's appearance or physical properties.
corrosion covers a number of processes whereby a metal changes stae as a result of some form of ineraction with environment. It often occurs when water, either as a liquid or vapour in air of high humidity, is present.
In general, corrosion becomes worse when impurities are present in damp conditions. It never starts inside a material, and there will always be surface evidence that indicates corrosion exists, although close examination may be needed.
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