
Electrochemical, mechanical, and tribological properties of corrosion product scales formed on X65 steel under CO2 supercritical pressure environments
2022; Elsevier BV; Volume: 446; Linguagem: Inglês
10.1016/j.surfcoat.2022.128789
ISSN1879-3347
AutoresKatryanne Rohana Georg Bacca, Natália Feijó Lopes, Giovanni dos Santos Batista, Carlos Alexandre dos Santos, Eleani Maria da Costa,
Tópico(s)Metal and Thin Film Mechanics
ResumoThis study investigates the properties of corrosion product scales formed on API 5 L X65 steel under CO2 supercritical pressure for 7 and 15 days in NaCl solution and brine. The structure, composition, electrochemical performance, mechanical, and tribological properties of the scales were characterized using multiple techniques, including scanning electron and atomic force microscopies, X-ray microtomography, X-ray diffraction, potentiodynamic polarization, electrochemical impedance spectroscopy, nanoindentation, and wear tests. The FeCO3 scales exhibited superior properties to FexCa1–xCO3. The presence of Ca2+ in brine favored scale dissolution, decreased the protection capability of steel against CO2-corrosion, and deteriorated the mechanical properties and wear resistance.
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