Conventional, Ionic, and Electron Flow in Corrosion Processes
In corrosion processes, three types of flow are crucial: electron flow, conventional current flow, and ionic flow. Electron flow moves in one direction, opposite to the conventional current flow, which is what most meters detect. Ionic flow involves the movement of ions back and forth. In a corrosion cell, the anode corrodes, producing metal loss, while the cathode, protected by the reaction, can develop hydrogen gas, potentially leading to issues like coating damage or hydrogen-induced cracking.
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