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Advances in Materials Science and Engineering
Volume 2015 (2015), Article ID 250836, 10 pages
http://dx.doi.org/10.1155/2015/250836
Research Article

Interactions between Phosphoric/Tannic Acid and Different Forms of FeOOH

1School of Material Sciences and Technology, China University of Geosciences, Beijing 100083, China
2China Science and Technology Museum, Beijing 100029, China
3School of Material Sciences and Technology, Beijing University of Chemical Technology, Beijing 100029, China

Received 23 July 2014; Accepted 17 September 2014

Academic Editor: Zhaohui Li

Copyright © 2015 Lefu Mei et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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), X-ray 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.