Problem 6.3: Four requirements must be present for

From Chapter 6 Problem Set. Level 1: Conceptual Mastery.

Question

Four requirements must be present for electrochemical corrosion to occur in water. Name all four and explain why removing any single one stops the reaction.

Answer

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Anode (a material capable of being oxidized), cathode (an oxidizing species capable of accepting electrons), electrolyte (the water, which allows dissolved ions to move), and metal path (allows electrons to move). Remove the anode: no material to oxidize. Remove the cathode: no electron acceptor. Remove the electrolyte: no ionic pathway to complete circuit. Remove the metal path: electrons cannot flow between anode and cathode. Without all four, electrochemical corrosion in water comes to a halt.