One drop of water sitting on a metal surface creates an electrochemical cell. The metal may be approximately uniform in composition but the water drop is not, and that is all that is required to start localized attack. The environment needs only to vary in concentration, velocity, or temperature to set up local anode and cathode areas on the metal. The cathodes, of course, will be where the environment reacts best.
KeywordsCorrosion Rate Passive Film Corrosion Control Cathodic Protection Crevice Corrosion
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