Abstract
The present work utilizes a recently proposed methodology for performing tests and analysing the data from electrochemical hydrogen permeation experiments so as to characterize the effect of surface coating layers on hydrogen ingress into the sample. This methodology has been successfully applied to nitrogen ion-implanted API-5L-X65 type pipeline steel. Hydrogen permeation experiments were conducted using a double electrolytic cell, thermostatically controlled at 308 K, containing a 0.1 N NaOH solution in both compartments. The hydrogen permeability behaviour of the low alloy high strength steel is significantly altered when it is coated with a nitrogen ion implanted layer. The implanted layer was shown to possess an apparent hydrogen diffusivity much smaller than that of the substrate steel, while presenting an apparent hydrogen solubility considerably greater than that of the uncoated substrate.
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