Understanding the local pitting corrosion characteristics of carbon steel in CO2 corrosion environment using artificially machined pits
نویسندگان
چکیده
Carbon steel remains the most commonly used material in CO 2 – containing oilfield, and other energy applications. Pitting corrosion is a prominent form of attack on carbon steel, linked to formation non protective iron carbonate (FeCO 3 ) films and/or their breakdown. The conditions for local breakdown FeCO , fundamental aspects pitting still not clearly understood; particularly relation evolution chemistry within active pits. Local distribution activities/species likely influence formation; properties support impede pit propagation. This study investigates environment an artificially machined pits understand behaviour. It focuses corrosion. Pits with specific geometry X65 samples are exposed two different environments; pH 4 5.9 168 h. Tests were performed at atmospheric pressure 60 °C 1 M NaCl solution. Linear polarization technique was implemented combination suite post-experiment surface analysis; Scanning Electron Microscopy, X-ray diffraction, 3D-profilometry Raman spectroscopy assessing overall rate, localised product characteristics. Results show that both levels, more crystalline formed than top surfaces. size compactness decrease from base towards surfaces, correlate extent spatial variation chemistry. • induced electrochemical activities varies locations across profile. changes pit. In static environment, increase. Changes influences morphology protectiveness film. critical sustenance growth environment.
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ژورنال
عنوان ژورنال: Results in engineering
سال: 2022
ISSN: ['2590-1230']
DOI: https://doi.org/10.1016/j.rineng.2022.100700