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Abstract The experimental potential-pH diagrams for three groups of ferritic stainless steels(17Cr-xMo,25Cr-xMo and 30Cr-xMo,where x=0,2,4,6)in 1N C1~- solutions at 25℃ have been established through measuring the anodic polarization curves of these alloys in solutions with various pH values.The chromium contents in the alloys show significant effect on the initiation of pitting,while the effect of molybdenum contents on pitting breakdown potentials strongly depends on the chromium levels in the alloys.Small additions of molybdenum to Fe-Cr alloys result in remarkable shrinkage of the active corrosion region at lower pH and lower potentials,and thus exert significant inhibition effect on the propagation of localized comosion.Chromium also shows some influence on this active region,but this effect is much less signifi- cant than that of molybdenum.The synergic role of chromium and molybdenum at proper levels would be beneficial for the super-performance alloys to effect- ively resist the initiation and propagation of localized corrosion.
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Received: 25 April 1985
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