Abstract
18/10 chrome-nickel steel samples, sensitized to intergranular corrosion by heating at 550°C, when immersed in boiling 1N sulphuric acid give rise to oscillations of both potential and polarization current when the circuit resistance exceeds a certain value. These oscillations are connected with intergranular corrosion, and they are also observed in other solutions which give rise to intergranular attack (e.g. HF/HNO 3). Samples heated at 675°C are neither prone to intergranular corrosion nor do they show oscillations at the active corrosion potential. Possible processes concerning the periodic phenomena are discussed in connection with known dynamic behaviour of active iron. Besides electrochemical and dynamic properties there is also a certain geometric shape of the corrosion grooves at the grain boundaries connected with the periodic phenomena.
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