<P> Galvanic corrosion occurs when two different metals have physical or electrical contact with each other and are immersed in a common electrolyte , or when the same metal is exposed to electrolyte with different concentrations . In a galvanic couple , the more active metal ( the anode ) corrodes at an accelerated rate and the more noble metal ( the cathode ) corrodes at a slower rate . When immersed separately , each metal corrodes at its own rate . What type of metal ( s ) to use is readily determined by following the galvanic series . For example , zinc is often used as a sacrificial anode for steel structures . Galvanic corrosion is of major interest to the marine industry and also anywhere water ( containing salts ) contacts pipes or metal structures . </P>
<P> Galvanic corrosion occurs when two different metals have physical or electrical contact with each other and are immersed in a common electrolyte , or when the same metal is exposed to electrolyte with different concentrations . In a galvanic couple , the more active metal ( the anode ) corrodes at an accelerated rate and the more noble metal ( the cathode ) corrodes at a slower rate . When immersed separately , each metal corrodes at its own rate . What type of metal ( s ) to use is readily determined by following the galvanic series . For example , zinc is often used as a sacrificial anode for steel structures . Galvanic corrosion is of major interest to the marine industry and also anywhere water ( containing salts ) contacts pipes or metal structures . </P>
why does corrosion usually occur at an anode
why does corrosion usually occur at an anode
the more active metal ( the anode ) corrodes at an accelerated rate and the more noble metal ( the cathode ) corrodes at a slower rate
the more active metal ( the anode ) corrodes at an accelerated rate and the more noble metal ( the cathode ) corrodes at a slower rate