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The corrosion fatigue behaviour o f nitrogen implanted iron in neutral solutions has been investigated utilizing the oscillating cantilever beam method, by means o f electrochemical (Ecom vs. time plots, R , measurements) and S, E. M. techniques. lowered for the implanted iron at all nitrogen doses with respect t o untreated iron. The surface oxide layers achieve enhanced protecting capacity. Consequently under a cyclic load o f 2.5.4 kg m m -= , at a frequency o f 16.6 Hz, cracks nucleation is delayed. The time to breaking of implanted specimens is considerably lower in our experimental conditions compared t o untreated iron. The increase in the crack growth rate is consistent with the detrimental action of structural damage following implantation. The fracture morphology is also discussed. The calculated corrosion rate under stagnant conditions is

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