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
   77   78   79   80   81   82   83   84   85   86   87