Localized corrosion in selective laser melted SS316L in CO₂ and H₂S brines at elevated temperatures.

ABSTRACT: In this work, the passivation and localized corrosion of selective laser melted (SLM) stainless steel 316 L when exposed to high pressures of CO₂ with the presence of H₂S and Cl^- at 25 °C and 125 °C were studied. Depletion of Cr/Mo was observed at the cell interiors and melt-pool boundaries (MPBs) compared to the cell boundaries. Volta potential differences obtained from scanning Kelvin probe force microscopy (SKPFM) showed that the MPBs were 8-20 mV lower than the matrix, while the cell interiors were 20-50 mV lower than the cell boundaries. Electrochemical impedance spectroscopy (EIS) and Mott-Schottky tests indicated a more defective passive film at 125 °C, and X-ray photoelectron spectroscopy (XPS) confirmed the formation of a less protective film with

SUBMITTER: Narayanan D 

PROVIDER: S-EPMC11087244 | biostudies-literature | 2024

REPOSITORIES: biostudies-literature