Corrosion inhibition of iron in acid solutions by biological siderophores

Four siderophores isolated from bacteria have been studied as possible corrosion inhibitors for iron in deareated 1N HCl. These compounds are aerobactin, enterobactin, parabactin, and rhodotorulic acid. Polarization measurements and ac impedance studies show that all four compounds are inhibitors, w...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the Electrochemical Society 1995-05, Vol.142 (5), p.1447-1453
Main Authors: MCCAFFERTY, E, MCARDLE, J. V
Format: Article
Language:English
Subjects:
Applied sciences
Corrosion
Corrosion prevention
Exact sciences and technology
Metals. Metallurgy
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Four siderophores isolated from bacteria have been studied as possible corrosion inhibitors for iron in deareated 1N HCl. These compounds are aerobactin, enterobactin, parabactin, and rhodotorulic acid. Polarization measurements and ac impedance studies show that all four compounds are inhibitors, with the order of effectiveness being rhodotorulic acid < aerobactin < enterobactin < parabactin. X-ray photoelectron spectroscopy surface analysis with one of the siderophores, rhodotorulic acid, shows that it chemisorbs at the iron/HCl interface. Enterobactin and parabactin are the most effective corrosion inhibitors of the four because they have the optimum combination of relatively high values of pK sub(a1) and the largest molecular cross-sectional areas.
ISSN:0013-4651
1945-7111
DOI:10.1149/1.2048595