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Carbon dioxide and hydrogen sulfide corrosion of API 5L grades B and X52 steels

Abstract:

This article presents a study of the corrosion behavior of American Petroleum Institute (API) 5L grades B and X52 steels in 3% sodium chloride (NaCl) in distilled water under carbon dioxide (CO 2) and hydrogen sulfide (H 2S) gas mixtures. The study found that, as CO 2 partial pressure increased, corrosion rates increased for a given H 2S partial pressure for both steels. As H 2S partial pressure was increased for a given CO 2 partial pressure, corrosion rates on API 5L grade B, with incremental H 2S levels, reached a maximum and then decreased. On API 5L X52, corrosion rates increased with increasing H 2S partial pressure. At 12 Pa (0.0017 psi) partial pressure of H 2S, API 5L X52 steel suffered blistering and crack formation similar to that observed in hydrogen-induced cracking (HIC).