precipitates. However, simulations did not show any further penetration of water into the γ-FeOOH during the runtime, suggesting that the newly formed surface layer might be stable, similar to a defect-free surface. Similar observations were made for chloride-induced corrosion for defective γ-FeOOH surfaces. The deterioration involved enhanced adsorption of Cl⁻ ions at the defective sites. Interestingly, this attracted Na + ions into the vicinity. Therefore, the authors proposed that the Na-Cl ion pair drives the breaking of the γ-FeOOH structure.