Use of Moessbauer spectroscopy to study reaction products of polyphenols and iron compounds

Journal Article · Sun May 01 00:00:00 EDT 1994 · Corrosion (Houston); (United States)

DOI:https://doi.org/10.5006/1.3294344· OSTI ID:7037593

Gust, J ^[1]; Suwalski, J ^[2]

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1. Building Research Inst., Warsaw (Poland)
2. Atomic Energy Inst., Otwock-Swierk (Poland)

Moessbauer spectroscopy was used to study parameters of the reaction products of iron compounds (Fe[sup III]) and polyphenols with hydroxyl (OH) groups in ortho positions. Polyphenols used in the reaction were catechol, pyrogallol, gallic acid, and oak tannin. The Fe-containing compounds were hydrated ferric sulfate (Fe[sub 2][SO[sub 4]][sub 3][center dot]nH[sub 2]O), lepidocrocite ([gamma][center dot]FeOOH), goethite ([alpha]-FeOOH), magnetite (Fe[sub 3]O[sub 4]). Within a pH range of 1 to 7, all the polyphenols were shown to form with Fe[sup III] sparingly soluble complexes that were mixtures of mono- and bis-type complexes with different Moessbauer parameters. Parameters of each of the complex types were similar irrespective of the structure of the polyphenol used. A mixture of the mono- and bis-type complexes also formed as a result of a reaction between rust-phase components and oak tannin in an aqueous solution. When the reaction occurred on a surface of the rusted steel coated with an oak tannin solution, mainly mono-type complexes were formed. These complexes imparted anticorrosive properties to the converted rust.

• OSTI ID: 7037593
• Journal Information: Corrosion (Houston); (United States), Vol. 50:5; ISSN 0010-9312
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CORROSION INHIBITORS
SYNTHESIS
IRON HYDROXIDES
CHEMICAL REACTIONS
IRON OXIDES
IRON SULFATES
POLYPHENOLS
CARBON STEELS
CORROSION PRODUCTS
IRON COMPLEXES
MOESSBAUER EFFECT
ALLOYS
AROMATICS
CHALCOGENIDES
COMPLEXES
HYDROGEN COMPOUNDS
HYDROXIDES
HYDROXY COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
IRON COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHENOLS
STEELS
SULFATES
SULFUR COMPOUNDS
TRANSITION ELEMENT COMPLEXES
TRANSITION ELEMENT COMPOUNDS
360105* - Metals & Alloys- Corrosion & Erosion