The authors added the explanation of corrosion potentials (p. 29) in which the corrosion potential of Fe-C-MoO2 is shifted to the more negative value compared with that of Fe. The reviewer can not understand this explanation. It is assumed that the authors ignore the electrochemistry, i.e., the electron transfers at the solid/electrolyte interface must obey the electrochemical rule and when the cathodic reaction rate is enhanced, the corrosion potential (i.e., the open circuit potential in a corrosion system) must be shifted to the positive direction.

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