2021/04/14 by Dominik Dworschak, Marina Bishara, Dworschak, Dominik +5
Materials Science · #Anodic Oxide Films and Nanostructures #Applied Physics (physics.app-ph) #Corrosion Behavior and Inhibition #FOS: Physical sciences #Hydrogen embrittlement and corrosion behaviors in metals #Materials Science (cond-mat.mtrl-sci)
paper · pdf · doi:10.48550/arxiv.2104.07100
openalex publication_date 2021/04/14 · openalex created_date 2022/07/25 · openalex updated_date 2026/07/28
Understanding elemental corrosion currents and visualizing corroding topographies provide a detailed insight into corrosion mechanisms at the nano-scale. Here, we develop a strategy to understand the elemental composition, corrosion resistivity and local stability of passive materials. Specifically, we utilize a pulse voltammetry approach in a novel electrochemical AFM cell and complement this data by real-time dissolution currents based on spectro-electrochemical online analysis in an ICP-MS flow cell. We study the oxide properties and their protective behaviour, when formed under different applied potentials using alloy 600 as model sample. Both AFM and ICP-MS data show that passive films formed on alloy 600 at around +0.3 to +0.4~V in neutral 1 mM NaCl solution are most stable during anodic corrosion at +1.0~V, while AFM further demonstrates that local dissolution occurs, indicating locally varying defect levels in the passive film. In combination of both techniques, our approach provide real-time elementally resolved and localized information of passive film quality under corrosive conditions, and it may prove useful for other corroding materials.