Abstract
The corrosion behavior of austenitic and superaustenitic stainless steels was investigated in carbon dioxide-saturated synthetic oil field formation water using cyclic polarization tests. In order to measure the effect of carbon dioxide pressure, the samples were also exposed in a pressurized medium containing carbon dioxide and synthetic air. For this purpose, tests were performed for long exposure time at 80 °C under 8 MPa of a mixture of carbon dioxide and synthetic air both acting togethere. The results indicated that the type of corrosion on the surfaces of the samples after all the tests was pitting corrosion. According to the results, the AL-6XNPLUS™ steel presented the best performance in all experiments. The results also indicated that the conventional austenitic stainless steels are not suitable for the use in carbon dioxide containing environment in aqueous medium.
Highlights
On the coast of Brazil, there is a salt layer that contains an oil of good quality located below it
The materials used in this study were the AL-6XNPLUSTM super austenitic stainless steel and two conventional austenitic stainless steels (316L and 317L)
This means that the results involving reduction of corrosion resistance cannot be attributed to this phase
Summary
On the coast of Brazil, there is a salt layer that contains an oil of good quality located below it. This layer is called pre-salt (a geological formation on the continental shelves) and it is located under deep seawaters demanding good materials for extracting its oil[1]. The corrosion process in the pre-salt layer as well as in deep seawaters occurs under very specific conditions. The oil and gas industry are concerned about the impact of oil accidents on marine ecosystems. These accidents can be avoided by using materials more and more corrosion resistant in such conditions. There is a great interest, here in Brazil, to study the corrosion resistance of stainless steels with higher chromium content in their composition, such as the super austenitic stainless steels, because it is expected
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