Corrosion and its prevention
Electrochemistry · Chemistry
Molecule viewer
Interactive 3DBall-and-stick models with true bond angles — switch molecule to compare shapes.
Controls
Drag the sliders or type a value — the simulation updates live.
Study notes
Why does a zinc-coated (galvanized) nail resist rust even when scratched? Step 1: Zn (E° = −0.76) is more reactive than Fe (E° = −0.44). Step 2: Exposed at scratch: Zn becomes the anode, corrodes preferentially. Step 3: Fe stays cathode — protected while any Zn remains. Step 4: Contrast paint: a scratch exposes Fe → rust creeps under paint. Galvanization protects electrochemically, not just as a cover.