Microbial corrosion of metals exposed to air in tropical marine environments
- U.A. Campeche (Mexico). Programa de Corrosion del Golfo de Mexico
Carbon steel plates were exposed during twelve months to the marine tropical atmosphere of Campeche located at the Southeast of The Gulf of Mexico. The corrosion products of steel were analyzed monthly employing scanning electron microscopy aided with energy dispersive spectroscopy (SEM-EDS) and Fourier transform infrared spectroscopy (FTIR). Also on a monthly basis the main meteorological parameters and the NaCl and SO{sub 2} deposition rates were recorded. The FTIR and SEM-EDS morphology, compound and composition studies indicated that amorphous oxyhydroxide and then lepidocrocite were formed during the first months of exposure. From five to nine months when relative humidity mean value was 75%, goethite was clearly detected. Filaments, channels and other unusual inorganic morphologies were observed at the steel samples surfaces having spots of high carbon contents, around 65 wt.% by SEM-EDS analysis and FTIR C-O bondings typical of organic material. These corrosion products could be associated to microbially induced corrosion activity.
- OSTI ID:
- 382553
- Report Number(s):
- CONF-960389--
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
42 ENGINEERING
BACTERIA
BIOLOGICAL FOULING
CARBON STEELS
CHEMICAL ANALYSIS
CORROSION
CORROSION PRODUCTS
EXPERIMENTAL DATA
FOURIER TRANSFORM SPECTROMETERS
GULF OF MEXICO
HYDROXIDES
INFRARED SPECTRA
MORPHOLOGY
PITTING CORROSION
SCALING
SCANNING ELECTRON MICROSCOPY
SODIUM CHLORIDES
SULFUR DIOXIDE