With development of oil and gas exploitation in deepwater, more and more stainless steels have been used in flowline. However, stainless steels may suffer from pitting in seawater. This research was based on corrosion risk in laying process of subsea flowline. The initiation time of stainless steels immersed in seawater is one of the dominate factor during materials screening, design and laying of flowline. In this work, pitting corrosion behaviors of austenitic and duplex stainless steel including initiation was investigated. Also the effects of temperature, dissolved oxygen, salinity on corrosion were discussed by morphologic characterization of localized corrosion associated with its shape and size description. Another assessment was cyclic potentiodynamic polarization. During cyclic potentiodynamic polarization, it was recorded versus a saturated calomel electrode. The results show that temperature, dissolved oxygen, and especially temperature were main factors which affect corrosion behavior of stainless steels in seawater.
Pitting initiation of austenitic and duplex stainless steel in laying of flowline in deepwater
2011
8 Seiten, 7 Bilder, 2 Tabellen, 15 Quellen
Conference paper
English
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