Combining AFM imaging and elementally resolved spectro-electrochemistry for understanding stability and quality of passive films formed on Alloy 600

TL;DR

This study combines advanced AFM imaging and spectro-electrochemical analysis to investigate the stability, composition, and local corrosion behavior of passive films on Alloy 600, providing real-time, elementally resolved insights into corrosion mechanisms.

Contribution

It introduces a novel integrated approach using pulse voltammetry and ICP-MS to analyze passive film stability and composition at the nano-scale during corrosion.

Findings

Passive films formed at +0.3 to +0.4 V are most stable during corrosion.

Local dissolution indicates defect levels in passive films.

The combined method offers real-time, localized elemental information.

Abstract

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.