Effect of Sulfide on Carbon Steel Corrosion in Anaerobic Near-Neutral pH Saline Solutions

Severe corrosion damage may occur when gas transmission pipelines are exposed, at disbonded coating locations, to trapped waters containing sulfide. This scenario has been investigated in long-term anaerobic experiments in which corrosion was followed by measurement of corrosion potentials and relat...

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Bibliographic Details
Published in:Corrosion (Houston, Tex.) Tex.), 2013, Vol.69 (1), p.67-76
Main Authors: SHERAR, B. W. A, KEECH, P. G, NOËL, J. J, WORTHINGHAM, R. G, SHOESMITH, D. W
Format: Article
Language:English
Subjects:
Anaerobic conditions
Analytical methods
Anoxic conditions
Applied sciences
Carbon steel
Carbon steels
Cathodic protection
Corrosion
Corrosion effects
Corrosion environments
Corrosion potential
Corrosion products
Corrosion rate
Corrosion resistance
Corrosion tests
Electrodes
Electrolytes
Electron microscopy
Exact sciences and technology
Experiments
Exposure
Gas pipelines
Gas transmission
Groundwater
Linear polarization
Magnetite
Metals. Metallurgy
Morphology
Natural gas
Pipelines
Polished
Raman spectroscopy
Saline solutions
Scanning electron microscopy
Steel
Steels
Submarine pipelines
Sulfide
Sulfides
Sulfur
Sulphides
Sulphur
X ray analysis
X-ray spectroscopy
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Summary:Severe corrosion damage may occur when gas transmission pipelines are exposed, at disbonded coating locations, to trapped waters containing sulfide. This scenario has been investigated in long-term anaerobic experiments in which corrosion was followed by measurement of corrosion potentials and relative corrosion rates obtained from linear polarization resistance measurements. The properties and composition of the corrosion product deposits formed were determined using scanning electron microscopy, energy-dispersive x-ray analysis, and Raman spectroscopy. Under anaerobic conditions, corrosion rates were lower for freshly polished steel than for precorroded carbon steel exposed to sulfide, suggesting pre-oxidization of the steel surface prevents passivation in the presence of sulfide. Under these last conditions, a non-protective layer of mackinawite forms on the surface and magnetite/maghemite are chemically converted to sulfide and sulfur, leading to a slow increase in corrosion rate.
ISSN:0010-9312
1938-159X
DOI:10.5006/0687