(Invited)Localized Dissolution Kinetics From Fast In Situ Radiography of Propagating Pits in Stainless Steel and Implications for Modeling Pitting Corrosion over Long Time-Scales

Abstract

In-situ synchrotron radiography has been used to observe propagating 2D pits in a thin foil of 304 stainless steel sandwiched between glass slides. Key kinetic parameters have been extracted from these radiographs such that they can be used as input parameters for numerical simulations of pitting corrosion. Simulation results are presented for pits growing under potentiostatic control, with a focus on propagation stability in the concentrated (> 1M) chloride solutions that cause atmospheric pitting corrosion of 304 stainless steel.

Effect of Microstructure on the Morphology of Atmospheric Corrosion Pits in Type 304L Stainless Steel

“…Synchrotron x-ray absorption methods have been increasingly used to investigate corrosion propagation in steels in situ. Radiography has been used to measure influence of solution resistance on corrosion interface morphology [35][36] and the influence of oxidizing agents. [37][38][39] Microtomography has also been used to show propagation of pitting under atmospheric conditions.…”

Mechanistic studies of atmospheric pitting corrosion of stainless steel for ILW containers

“…The diffusion-limited current density (at +0·6 V) varies with chloride ion concentration owing to the common ion effect on the saturation concentration of FeCl 2 .4H 2 O. 17,18 It is also important to explore how the Tafel kinetics, diffusivity and conductivity vary in highly concentrated solutions.…”

Corrosion resistance of hot-dip galvanized steel in simulated soil solution: A factorial design and pit chemistry study

“…The solubility of a metal salt decreases in the presence of a common-ion. This phenomenon, known as the commonion effect, is the main mechanism for observed decreases of D.C S with bulk solution composition [60,61]. Moreover, the presence of a corrosion inhibitor [50] or an accelerator [36] is believed to influence metal dissolution by modifying the salt film composition.…”