Influence of anions on the formation of artificial steel rust particles prepared from acidic aqueous Fe(III) solution

• Published in: Corrosion science 2013-01, Vol.66, p.136-141
• Main Authors: Tanaka, Hidekazu, Hatanaka, Nagisa, Muguruma, Miya, Ishikawa, Tatsuo, Nakayama, Takenori
• Format: Article
• Language: English
• Subjects: A. Iron; A. Steel; Anions; Applied sciences; Aqueous solutions; Atmospheric corrosion; B. TEM; B. X-ray diffraction; C. Atmospheric corrosion; C. Rust; Corrosion; Corrosion environments; Exact sciences and technology; Metals. Metallurgy; Rusting; Simulation; Steels
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2012.09.011

► Artificial steel rust particles were prepared in the presence of FeCl3, Fe(NO3)3 and Fe2(SO4)3. ► In FeCl3–Fe(NO3)3 system, added Cl− turned the products from α-FeOOH to β-FeOOH. ► Existence of SO42− formed Schwertmannite and increasing the added SO42− suppressed the formation of steel rust particles. ► Influence of anions on the formation of steel rust particles is suggested to be in order of SO42−≫Cl−>NO3−. For simulation of atmospheric corrosion of steels, artificial steel rust particles were prepared in acidic aqueous solutions containing FeCl3, Fe(NO3)3 and Fe2(SO4)3. A single phase α-FeOOH was formed in only Fe(NO3)3 system. The β-FeOOH was formed by added Cl− in FeCl3–Fe(NO3)3 system. Adding SO42− in Fe(NO3)3, FeCl3 and a mixture of FeCl3–Fe(NO3)3 solutions turned the products following as α- or β-FeOOH→Schwertmannite (Fe8O8(OH)6(SO4)·nH2O). Further, increasing the added SO42− suppressed the formation of steel rust particles. Accordingly, the influence of anions on the formation of steel rust particles was to be suggested in order of SO42−≫Cl−>NO3−.