* Electrochemical Series: The reactivity of metals is determined by their position in the electrochemical series. Metals higher in the series are more reactive. Iron sits higher than copper, meaning it loses electrons (oxidizes) more easily.
* Oxidation Potential: Iron has a more negative standard electrode potential (-0.44 V) compared to copper (+0.34 V). This means iron has a greater tendency to lose electrons and become oxidized.
* Formation of Oxide Layers: While both metals form oxide layers, iron's oxide (rust) is flaky and porous. This allows oxygen and moisture to penetrate, leading to further oxidation and corrosion. Copper's oxide layer (patina) is more protective and forms a barrier, preventing further corrosion.
In summary: Even though copper appears more resistant to corrosion in everyday life, iron is inherently more reactive due to its higher position in the electrochemical series and greater tendency to oxidize. This is why iron corrodes more easily than copper.
