Chemistry › Section Q · Electrochemistry › Topic Q.6
Corrosion and electrolysis
Left alone, iron in damp air slowly runs a galvanic cell that eats it away. Push electrons the other way with a power supply and you can split water, refine metals and plate a spoon with silver, all in amounts you can calculate from the current and the time.
In this topic
- Redox we fight and redox we force
- How iron rusts
- Why rust keeps spreading
- Keeping metal safe
- Sacrificial anodes
- Worked example: choosing a sacrificial anode
- Electrolytic cells
- Molten salts, water and brine
- Counting electrons: charge, current and time
- Worked example: copper plating
- Common mistakes to avoid
- Key takeaways
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