Session: Recent Experiences With Austenitic and Duplex Stainless Steels
Crevice Corrosion of 316L and 2205 Alloys in Low-pH Offshore Flocculant Systems (C2026-00197)
Thursday, March 19, 2026
9:00 AM - 9:30 AM Central
Location: 370 EF
Earn .5 PDH
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In offshore water injection systems, low-pH flocculants used for filtration and separation can pose significant corrosion risks to storage and injection equipment. This study evaluates the crevice corrosion behavior of two stainless steel alloys—316L and 2205 duplex—when exposed to aggressive flocculant chemistries deployed in the North Sea. Flocculants tested included FLOCTREAT A, FLOCTREAT B, ALS, and PIX 313 (pH 1–2), using ASTM G48 at 25 °C and 50 °C for 30 days. The results revealed that 316L was susceptible to crevice corrosion, especially at elevated temperatures and in the presence of PIX. By contrast, 2205 duplex stainless steel exhibited superior resistance with minimal localized attack. These findings support transitioning from 316L to 2205 as a practical mitigation strategy in corrosive environments. As future work, chemical reformulation approaches are proposed—specifically, designing flocculants that maintain stability at pH levels above 4. This would reduce acidity and further minimize corrosion risk without compromising functional performance.
