Severe corrosion damage may occur when gas transmission pipelines are exposed, at disbonded coating locations, to trapped waters containing sulfide followed by secondary exposure to air. Aerobic corrosion with sulfide was investigated in a long-term corrosion experiment in which corrosion was monitored by measurement of the corrosion potential and polarization resistance 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. The corrosion rate is low when steel is exposed to anaerobic conditions (pH = 8.9). A switch from aerobic to aerobic-with-sulfide corrosion doubles the relative corrosion rate. Aerobic exposure induces the formation of goethite-covered tubercles. Continual sulfide exposure leads to the slow conversion of goethite to mackinawite.
The effect of sulfide on the aerobic corrosion of carbon steel in near-neutral pH saline solutions
Einfluss von Sulfiden auf die aerobe Korrosion von Kohlenstoffstahl in nahezu pH-neutralen Salzlösungen
Corrosion Science ; 66 ; 256-262
2012
7 Seiten, 8 Bilder, 2 Tabellen, 36 Quellen
Article (Journal)
English
unlegierter Stahl , Rohrstahl , Gasfernleitung , Korrosionsgeschwindigkeit , Schichtablösung , Sulfid , bakterielle Korrosion , aerobe Bakterien , Langzeitversuch , Korrosionspotenzial , Polarisationskurve , anaerobe Bakterien , Oberflächenanalyse , Korrosionsprodukt , Raman-Spektroskopie , energiedispersive Röntgenspektrometrie , Oberflächenschicht
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