In-situ micro-visualization was used to study the pitting corrosion of a 25 Cr Duplex Stainless Steels in chloride containing aqueous solutions containing CO2 gas at high temperatures and high pressures. A small area on the surface of the sample was imaged and video recorded (in real time) during the anodic polarization in the gas/liquid environment. The video and images obtained during the corrosion process were used to confirm the potential under which the transition from passivity to pitting corrosion could take place in this alloy. This methodology allowed the observation of initiation sites for pitting corrosion on the 25 Cr DSS sample.

Subject
Energy dispersive X-ray spectroscopy, Water, Materials, Composition, Sodium chloride, Anode surfaces, Pitting, Ferrite, Anodic polarization, Grain, Austenite, Inclusions, Samples
Keywords:
In-situ, Electrochemistry, DSS, Pitting, CPT, Ferrite, Austenite, Inclusions, Precursor Sites
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2013
Association for Materials Protection and Performance (AMPP)
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