Corrosion inhibition of iron in acid solutions by biological siderophores

Journal Article · Mon May 01 04:00:00 EDT 1995 · Journal of the Electrochemical Society

DOI:https://doi.org/10.1149/1.2048595· OSTI ID:63186

McCafferty, E ^[1]; McArdle, J V ^[2]

---

1. Naval Research Lab., Washington, DC (United States)
2. Univ. of Maryland, College Park, MD (United States). Dept. of Chemistry

Four siderophores isolated from bacteria have been studied as possible corrosion inhibitors for iron in deaerated 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.

• Sponsoring Organization: USDOE
• OSTI ID: 63186
• Journal Information: Journal of the Electrochemical Society, Journal Name: Journal of the Electrochemical Society Journal Issue: 5 Vol. 142; ISSN 0013-4651; ISSN JESOAN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHELATING AGENTS
CHEMISORPTION
CORROSION INHIBITORS
CORROSION PROTECTION
HYDROCHLORIC ACID
IRON
MOLECULAR STRUCTURE
PERFORMANCE TESTING