Interactions between Phosphoric/Tannic Acid and Different Forms of FeOOH

Abstract

Alpha, beta, gamma, and delta hydroxyl ferric oxides (FeOOH), as the most common rust layers on iron surface, play different roles in iron preservation. Using modern surface analysis technologies such as X-ray diffraction (XRD), infrared spectra (IR), Xray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM), we studied the interactions between these four types of synthetic FeOOH and phosphoric and tannic acid of different concentrations and proportions. A 3% tannic acid + 10% phosphoric acid + FeOOH was the most suitable formula for rust stabilizer and its reaction products were made up of iron phosphate and chelate of iron and tannin. This research provided technical basis in distinguishing FeOOH and selecting rust layer stabilizer for the preservation of iron, especially iron cultural relics.

Ultra-small and highly dispersive iron oxide hydroxide as an efficient catalyst for oxidation reactions: a Swiss-army-knife catalyst

“…It was reported that the FTIR bands at 883 and 795 cm −1 were related to the –OH bending modes in α-FeOOH (Fig. 1 a) 20 , 21 . The bands at 847 and 696 cm −1 were attributed to the –OH bending modes in β-FeOOH (Fig.…”

“…1 a; Fig. S1 ) 19 , 20 . Mei et al studied FTIR spectra of α-, β-, γ- and δ-FeOOH and outlined the features attributed to FeO 6 groups in these compounds at 400–1100 cm −1 (Fig.…”

A Self-Strengthening Epidermis-Like Smart Coating Enabled by Dynamic Iron Sequestration

“…26 Here, the accelerated corrosion of steel due to the increased local ionic strength at the coating and substrate interface induces the in-situ formation of rust likely iron (III) oxyhydroxide (Figure 2c), which can spontaneously react with TA forming iron-TA complexes. 26,30,31 The generated transient high concentration of iron at the interface promotes the ionic diffusion upwards within the polymer matrix following the concentration gradient (Figure 2c), which is maintained by the continuous reaction at the interface. While Fe 3+ can move around the polymer network in saltwater in a highly reversible fashion, 32 it is more likely iron-TA complexes diffuse as a whole considering the dynamic nature of hydrogen bonding between PVA and TA and the relative small molecular weight of TA molecules.…”

Mechanism of corrosion protection in chloride solution by an apple-based green inhibitor: experimental and theoretical studies

“…It is known that phosphates can catalyze the oxygen evolution at near neutral pH [77]. In addition, they can stabilize the corrosion product layer [47]. Therefore, C 26 H 50 NO 7 P played the main role in converting Fe 3 O 4 to Fe 2 O 3 .…”