What does corrosion require in terms of electrolyte and contact?

What does corrosion require in terms of electrolyte and contact?

• A. A conductive path between the two areas of potential difference
• B. To heat the surface
• C. To mechanically rub the surface
• D. No electrolyte is needed

Answer: (A)

Corrosion is an electrochemical process that only happens when two things exist: an electrolyte to move ions and a conductive connection that links two regions with different electrochemical potential. In practice, the electrolyte allows ions to carry charge, while electrons flow through the metal from the anodic area to the cathodic area, completing the circuit. If there isn’t a conductive path between those areas, the current can’t flow and corrosion cannot proceed. If there’s no electrolyte, ions can’t move, so the reaction can’t be sustained. Heating or rubbing aren’t the driving factors; moisture or salt in the environment supplying the electrolyte is what enables the process.

Corrosion is an electrochemical process that only happens when two things exist: an electrolyte to move ions and a conductive connection that links two regions with different electrochemical potential. In practice, the electrolyte allows ions to carry charge, while electrons flow through the metal from the anodic area to the cathodic area, completing the circuit. If there isn’t a conductive path between those areas, the current can’t flow and corrosion cannot proceed. If there’s no electrolyte, ions can’t move, so the reaction can’t be sustained. Heating or rubbing aren’t the driving factors; moisture or salt in the environment supplying the electrolyte is what enables the process.