Galvanic corrosion

When dissimilar metals are in electrical contact in an electrolyte, the less noble metal (anode) is attacked to a greater degree than if it vere exposed alone, and the more noble metal (cathode) is attacked to a lesser degree than if it avere exposed alone. This behavior, known as galvanic corrosion, can often be recognized by te fact that the corrosion is more severe near te junction of the two metals than elsewhere on the metal surfaces. Galvanic corrosion is usually the result of poor design and selection of materials or the plating-out of a more noble metal from solution on a less noble metal.
The greater the difference in potential between the two metals, the more rapid the galvanic attack wili be. The textbook electromotive-force series ranks the metals according lo their chemical reactivity, but applies only to the laboratory conditions under which the reactivity was determined. In practice, the solution potential of metals is affected by the presente of passive or other protective films on some metals, polarization effects, degree of aeration, complexing agents, and temperature.
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