日本金属学会誌

J. Japan Inst. Metals, Vol. 18, No. 11 (1954),
pp. 570-573

Studies on Corrosion at Power Generation Stations Using. Acid River Water (8th Report). On the Relationships between the Natural Electrode Potential and the Corrosion Rate (II)

Saburô Shimodaira


Abstract:

In the case of ``mixed control'', the natural electrode potential is given by

where K1 is the specific rate constant of cathode reaction, C is the concentration of the adsorbed water molecules on the metal, 1>α >0, n is the valency of metal ions, EM0 is the standard electrode potential of metal, δ is the thickness of the diffusion layer and D is the coefficient of the diffusion. The equation fairly holds on some metals. The equation gives the following cnoclusions; the hydrogen evolution type corrosion cannot occur with mercury, hismuth, copper, and silver. Hydrogen does not evolve in the range of pH higher than 5 to 6 with nickel, lead and tin. The corrosion should cease at pH 9 with iron in air-free solutions. Chromium and cadmium resemble iron. Aluminum would be thoroughly corroded evolving hydrogen gas in all concentrations of alkaline solutions.


(Received 1954/6/19)

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