Corrosion Thermodynamics

• decides if reaction can occur metals --> rust
• delta G - determine reaction possibility
• Mg + H2O + 1/2O2 --> Mg(OH)2

  delta G= -596kj/mol
• more negative=more corroded
• noble metals do not corrode
• Au +3/2 H2O + 3/4 O2 <-- Au (OH)3

  delta G= 66 kj/mol