Mössbauer and XRD analysis of corrosion products on weathering steel treated by wet-dry cycles using various solutions

Weathering steels (COR-TEN) were corroded by wet-dry cycles using a splay of various solutions in a laboratory. Corrosion products on weathering steel were characterized by X-ray diffractometry and Mossbauer spectrometry at room and low temperatures. Fine α-FeOOH, γ-FeOOH and γ-Fe 2O3 are fundamentally formed in various atmospheric conditions. β-FeOOH is additionally formed under the existence of chloride ions, but not formed when sulfate ions are coexisting. Spraying a NaF solution prevents the progress of corrosion.