Passivation characteristics of ultra-thin 316L foil in NaCl solutions

• DOI: 10.1016/j.jmst.2022.01.043
• Publication Date: 2022-05-12T22:46:42Z
• Authors: Xiaoqi Yue; Zhile Yang; Luyao Huang; Lei Zhang; Jun Li; Zhaozhan Xue; Jinshan Pan
• Keywords: Passivation

Electrochemical behaviour and passive film characteristics of an ultra-thin 316L foil with a thickness 20 μm in 3.5 wt.% NaCl solution were investigated using multiple techniques, focusing on the effect microstructure, applied potential, pH solution. The microstructure contains mainly fine grains (∼4 μm) high-angle boundaries preferential orientation (220), no MnS inclusion was detected. electrochemical measurements show significantly higher breakdown potential lower current density for than traditional wrought 316L. surface analyses angle-resolved X-ray photoelectron spectroscopy (ARXPS) time-of-flight secondary ion mass (TOF-SIMS) reveal that, compared to material, both inner out parts are more enriched Cr- Mo-oxides. favourable elemental diffusion absence facilitate formation continuous compact Mo-rich film, which effectively retards corrosion remains stable acidic (pH 2) or at high polarised up 600 mV vs Ag/AgCl.