鋼の腐食疲労における電位-pH図の変化

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Observation has been enacted of behaviours of corrosion fatigue of carbon steel under potential controlled conditions in buffer solutions of various pH values, and electrochemical studies have been made on the characteristics of the materials with respect to its passivation and immunity, as well as on the variation in the potential-pH diagram under the repetition of stress cycles. Cathodic protection is found as not efficient enough for the protection of metals against corrosion fatigue in the solutions of pH 1, while the perfect efficiency can be expected at E= -1200 mV in pH 4 and at E=-1000 mV in pH 6, being more easy in the solutions of higher pH values. On the other hand, anodic protection is fairIy efficient in the solution even of lower pH value, though perfect efficiency is not reached. in this instance for protection of metals irrespective of the pH value of the solution. The cathodic protection at the electrode potential which is efficient against the static corrosion is not efficient enough when applied to the material under the repetition of stress cycles in corrosive environments, since the domain of corrosion in the direction of the cathodic protection in the potential-pH diagram is expanded, due to the increase in metal activity, in the direction of negative electrode potential in the course of repetition of stress cycles. Perfect cathodic protection is inhibited when 1N H_2S0_4 of pH 1 is used, since metal dissolution is observable from the very beginning of stress cycles throughout in spite of the low electrode potential. On the other hand, the domain of corrosion remains in the direction of positive electrode potential in spite of the corrosion fatigue, but in the anodic protection, even at the sufficiently positive potential of higher grade than the Flade potential (E_F), metal dissolution is inevitable with stress cycles. The E_F is immaterial after all so far as corrosion fatigue is concerned.
社団法人日本材料学会の論文
1970-01-25

鋼の腐食疲労における電位-pH図の変化

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