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Localized Corrosion of Mild Steel in Marginally Sour Environments
| Content Provider | Semantic Scholar |
|---|---|
| Author | Esmaeely, Saba Navabzadeh Zhang, Wei-Ping Brown, Bruce Singer, Marco Srdjan Nešić |
| Copyright Year | 2017 |
| Abstract | Localized corrosion has been a challenge for the integrity of mild steel pipelines, specifically at operating conditions where a trace amount of H2S is present alongside CO2 at lower temperatures. The presence of H2S will lead to the formation of a protective iron sulfide layer that will decrease the general corrosion rate; however, a trace amount of H2S may only form a partially protective mackinawite layer that could result in localized corrosion. In the current study, mild steel specimens (API 5L X65) were exposed to a 1 wt% NaCl solution sparged at 0.096 MPa pCO2 and 15 ×10−6 MPa or less pH2S (≤150 ppm H2S/CO2). At pH 5.0 and 30°C the bulk solution was undersaturated with respect to iron sulfide—mackinawite and iron carbonate. At these marginally sour conditions, a H2S/CO2 threshold of approximately 100 ppm was deduced, below which localized corrosion happened. No localized corrosion occurred for the same environmental conditions when H2S/CO2 ratio was above 100 ppm or when there was no H2S present. |
| Starting Page | 1098 |
| Ending Page | 1106 |
| Page Count | 9 |
| File Format | PDF HTM / HTML |
| DOI | 10.5006/2422 |
| Volume Number | 73 |
| Alternate Webpage(s) | http://www.icmt.ohio.edu/documents/NACE2018/C2018-10548.pdf |
| Alternate Webpage(s) | http://www.icmt.ohio.edu/documents/NACE2018/C2018-10984.pdf |
| Alternate Webpage(s) | https://www.ohio.edu/engineering/corrosion/research/publications/upload/Localized-Corrosion-of-Mild-Steel-in-Marginally-Sour-Environments.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
