Where dissimilar piping joins
In an electrolytic cell
Rust? It's oxidation. More likely to occur with moisture present.
Rust? It's oxidation. More likely to occur with moisture present.
Fretting corrosion is most likely to occur in situations where there is repetitive movement or vibration between two contacting surfaces. This movement can lead to the removal of protective oxide layers on the surfaces, exposing them to corrosion. It is common in mechanical components like bolted joints, bearings, and electrical connectors.
In a nickel and copper electrolytic cell, nickel would likely be the anode since it typically undergoes oxidation to release electrons into the external circuit. Copper, on the other hand, would be the cathode where reduction reactions occur.
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If you mean in solid ice, then there are three reasons. First ice is cold, so chemical reactions are slowed down a lot. Secondly ice is an electrical insulator. Rust depends on a electrolytic process where water supplies a charge to the rust site. And thirdly, ice is solid and impermeable to oxygen, so oxygen, which is needed for rusting, cannot get to the iron. Iron in a water and ice mixture will rust, though slowly, as the electrolytic process and the oxygen will both be present.
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Cathode
Reduction occurs at the cathode in an electrolytic cell. This is where cations in the electrolyte solution gain electrons and get reduced, leading to the deposition of a substance onto the cathode.
In the electrolytic cell, electrons flow from the negative terminal (cathode) to the positive terminal (anode). This flow allows for the oxidation of ions at the anode and the reduction of ions at the cathode, resulting in the desired chemical reactions to occur.