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Define area effect regarding galvanic corrosion?(a) cathodic area * anodic area(b) anodic area/cathodic area(c) cathodic area/anodic area(d) cathodic area + anodic areaThis question was posed to me in a national level competition.My question is based upon Eight Forms in portion Eight Forms of Corrosion of Corrosion Engineering

Answer»

Correct OPTION is (c) CATHODIC area/ANODIC area

To explain I would say: It is the ratio of cathodic to anodic areas. An unfavorable area ratio with a large cathodic area and SMALL anodic area results in high current density at the ANODE. The greater the current density at an anodic area the greater the corrosion rate.



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