Page 82 - Corrosion Engineering Principles and Practice
P. 82
C h a p t e r 4
60
Calculated Free Energies for Species Involved in the Global Aluminum-Air Reactions at 60°C
−3846087.21
−3392589.58
−478966.00
0.00
−6369.39
0.1
a O ΣG 0 (333 K) x G 0 (333 K) 2.303·RT·log 10 a O −4161.72 0.00 1 −631396.00 0.00 1 −670615.89 −35058.17 −4452.02 0.2 C o r r o s i o n T h e r m o d y n a m i c s 61
1
G 0 (333 K) ) (J mol –1 −1040.43 −157849 −7234.04 −841778 −239483
x 4 4 3 4 2
Species Reactants Al OH − O 2 Products − AlO 2 H 2 O TABLE 4.6