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Iron and steel corrosion mechanisms in a carbonate rich pore water: Multiscale characterization of the corrosion product layers
Author(s) -
Lotz Hélène,
Neff Delphine,
MercierBion Florence,
Bataillon Christian,
Dillmann Philippe,
Gardes Emmanuel,
Monnet Isabelle
Publication year - 2023
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202213417
Subject(s) - corrosion , cementite , materials science , siderite , metallurgy , bilayer , magnetite , raman spectroscopy , carbonate , nanoscopic scale , characterization (materials science) , mackinawite , scanning electron microscope , chemical engineering , composite material , microstructure , nanotechnology , chemistry , membrane , austenite , biochemistry , physics , optics , engineering
Corrosion experiments were performed on a ferrito‐pearlitic (P285‐NH) and a ferritic steel (Armco) in a synthetic solution representing the Callovo‐Oxfordian porewater during a month at 120°C. Corrosion product layers (CPLs) were characterized from micro to nanoscale in terms of morphology (electron microscopies), composition (energy dispersive X‐ray spectroscopy), and structure (µ‐Raman, selected area electron diffraction). Both systems present a Ca‐siderite bilayer which interface locates the metal original surface, and nano to micrometric magnetite islets on the internal carbonated layer and at the M/CPL interface. The impact of cementite is highlighted in terms of morphology of the CPL and corrosion mechanism.