Prevention of severe pitting corrosion of 13Cr pipeline steel by a sulfate reducing bacterium using a green biocide cocktail

IF 2.6 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Lingjun Xu, Adnan Khan, Pruch Kijkla, Sith Kumseranee, Suchada Punpruk, Tingyue Gu
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Abstract

To combat abiotic CO2 corrosion of pipelines, chromium steels (CrSs) are used to replace carbon steels, but CrSs can suffer very severe pitting corrosion caused by microbiologically influenced corrosion (MIC) because their passive films are not as good as those on high-grade stainless steels, and their MIC often involves (semi-)conductive corrosion product films. In this study, severe pitting corrosion (2.0 cm/a pitting corrosion rate) with a 7-day weight loss of 3.8 ± 0.5 mg/cm2 (0.26 mm/a uniform corrosion rate) was observed on 13Cr coupons incubated anaerobically with a highly corrosive pure-strain sulfate reducing bacterium (SRB) Desulfovibrio ferrophilus IS5 in 125 mL anaerobic vials filled with 50 mL enriched artificial seawater at 28°C. A popular green biocide, namely tetrakis hydroxymethyl phosphonium sulfate (THPS), was enhanced by biofilm dispersing Peptide A (a 14-mer) to mitigate SRB MIC against 13Cr. The 7-day weight losses for coupons with 50 ppm (w/w) THPS, 50 ppm THPS + 100 nM (180 ppb) Peptide A and 100 ppm THPS were reduced to 2.2 ± 0.2 mg/cm2, 1.5 ± 0.5 mg/cm2, and 0.3 ± 0.2 mg/cm2, respectively. The pitting rates also decreased from 20 mm/a to 12 mm/a, 8.6 mm/a, and 1.5 mm/a, respectively based on the maximum pit depth data for the 7-day incubation. Electrochemical tests using a miniature electrochemical glass cell design supported the weight loss trend with additional transient corrosion rate information. THPS was found to be effective in mitigating severe pitting corrosion on 13Cr, and the enhancement effect of Peptide A for THPS was manifested. This work has significant implications in field applications when CrSs are considered as metal choices to replace carbon steels to combat abiotic CO2 corrosion in pipelines. When SRB MIC is a possible threat, a mitigation plan needs to be implemented to prevent potentially very severe pitting that can lead to pinhole leaks.
使用绿色杀菌剂鸡尾酒防止硫酸盐还原菌对 13Cr 管道钢造成严重点蚀
为了应对管道的非生物二氧化碳腐蚀,人们使用铬钢(CrSs)来替代碳钢,但铬钢可能会因微生物影响腐蚀(MIC)而遭受非常严重的点蚀,因为铬钢的被动膜不如高级不锈钢的被动膜,而且其 MIC 通常涉及(半)导电腐蚀产物膜。在这项研究中,13Cr 试样与高腐蚀性纯种硫酸盐还原菌(SRB)Desulfovibrio ferrophilus IS5 在 125 mL 厌氧瓶中进行厌氧培养,瓶中注入 50 mL 高浓度人工海水,培养温度为 28°C,7 天的重量损失为 3.8 ± 0.5 mg/cm2(均匀腐蚀速率为 0.26 mm/a),观察到了严重的点状腐蚀(点状腐蚀速率为 2.0 cm/a)。生物膜分散肽 A(14-mer)增强了一种常用的绿色杀菌剂,即四羟甲基硫酸磷(THPS),从而降低了 SRB 对 13Cr 的 MIC。使用 50 ppm(w/w)THPS、50 ppm THPS + 100 nM(180 ppb)肽 A 和 100 ppm THPS 的试样的 7 天重量损失分别降低到 2.2 ± 0.2 mg/cm2、1.5 ± 0.5 mg/cm2 和 0.3 ± 0.2 mg/cm2。根据 7 天培养的最大坑深数据,点蚀率也分别从 20 mm/a 降至 12 mm/a、8.6 mm/a 和 1.5 mm/a。使用微型电化学玻璃池设计进行的电化学测试证实了重量损失趋势,并提供了更多的瞬时腐蚀速率信息。研究发现 THPS 能有效减轻 13Cr 的严重点腐蚀,肽 A 对 THPS 的增强作用也得到了体现。当考虑用 CrSs 作为金属替代碳钢来对抗管道中的非生物 CO2 腐蚀时,这项工作在现场应用中具有重要意义。当 SRB MIC 可能构成威胁时,需要实施缓解计划,以防止可能导致针孔泄漏的严重点蚀。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Frontiers in Materials
Frontiers in Materials Materials Science-Materials Science (miscellaneous)
CiteScore
4.80
自引率
6.20%
发文量
749
审稿时长
12 weeks
期刊介绍: Frontiers in Materials is a high visibility journal publishing rigorously peer-reviewed research across the entire breadth of materials science and engineering. This interdisciplinary open-access journal is at the forefront of disseminating and communicating scientific knowledge and impactful discoveries to researchers across academia and industry, and the public worldwide. Founded upon a research community driven approach, this Journal provides a balanced and comprehensive offering of Specialty Sections, each of which has a dedicated Editorial Board of leading experts in the respective field.
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