| YANG Jike,LI Zhong,WANG Junlei,LOU Yuntian,LI Xiaogang.Mitigation of Stress Corrosion Cracking of X80 Steel Induced by Sulfate Reducing Desulfovibrio Vulgaris Biofilm Using THPS[J],53(20):69-81 |
| Mitigation of Stress Corrosion Cracking of X80 Steel Induced by Sulfate Reducing Desulfovibrio Vulgaris Biofilm Using THPS |
| Received:November 22, 2023 Revised:December 04, 2023 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2024.20.006 |
| KeyWord:microbiologically influenced corrosion sulfate-reducing bacteria stress corrosion cracking THPS |
| Author | Institution |
| YANG Jike |
Corrosion & Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China;National Materials Corrosion and Protection Data Center, Beijing , China |
| LI Zhong |
Corrosion & Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China;National Materials Corrosion and Protection Data Center, Beijing , China |
| WANG Junlei |
Defense Engineering Institute, AMS, PLA, Henan Luoyang , China |
| LOU Yuntian |
Corrosion & Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China;National Materials Corrosion and Protection Data Center, Beijing , China |
| LI Xiaogang |
Corrosion & Protection Center, Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing , China;National Materials Corrosion and Protection Data Center, Beijing , China |
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| Abstract: |
| Microbiologically influenced corrosion (MIC) is a relatively recent research area in the corrosion field. The most common corrosive microorganism in MIC is sulfate-reducing bacteria (SRB), Desulfovibrio vulgaris. Meanwhile, stress corrosion cracking (SCC) which is induced by both applied stress on the metal and corrosive circumstance, always causes ruptures in industrial fields such as pipelines or storage tanks, leading to severe economic losses. The metabolic activities of D. vulgaris provide corrosion on metal surfaces. Disaster accidents in the industry often occur when pipelines are subjected to both SCC and MIC. X80 pipeline steel is a widely used material for oil and gas pipelines which is susceptible to both MIC and SCC. Hence, it is important to investigate how to mitigate the SCC behavior of X80 steel induced by MIC under continuous mechanical stress, using the X80 U-bend coupon which provides continuous stress on the X80 steel. To solve this problem, biocide, such as Tetrakis hydroxymethyl phosphonium sulfate (THPS) was used to inhibit microbial growth. Meanwhile, different concentration of injected THPS has different intensity on the mitigation process of D. vulgaris activity. X80 U-bend coupons were immersed in ATCC 1249 culture medium (250 mL in 450 mL anaerobic bottles) inoculated with D. vulgaris. Following a 14-day incubation period of D. vulgaris in ATCC 1249 culture medium at 37 ℃ with X80 U-bend coupons, the weight loss results were 2.7 mg/cm2 (0 mg/L), 1.4 mg/cm2 (15 mg/L), 1.1 mg/cm2 (30 mg/L), 0.7 mg/cm2 (45 mg/L) and 0.5 mg/cm2 (60 mg/L), respectively. The weight loss results indicate that the MIC rate declined with rising THPS concentration. When the THPS concentration is 60 mg/L, the MIC rate has been reduced to a relatively lower level. The sessile cell counts were 9.3×107 cells/cm2 (0 mg/L)，3.9×106 cells/cm2 (15 mg/L), 1.6×106 cells/cm2 (30 mg/L), 3.0×105 cells/cm2 (45 mg/L), 1.0×105 cells/cm2 (60 mg/L), respectively. The planktonic cell counts were 2.1×106 cells/mL (0 mg/L), 2.8×105 cells/mL (15 mg/L), 1.2×105 cells/mL (30 mg/L), 5.0×104 cells/mL (45 mg/L), 2.0×104 cells/mL (60 mg/L), respectively. Both types of cell counts describe that D. vulgaris was mitigated by the increasing THPS concentration. The weight loss results and cell count results describe that the MIC mechanism of X80 U-bend incubated with D. vulgaris follows the extracellular electron transfer (EET)-MIC mechanism. The SEM images of cracking on the X80 U-bend illustrated that the cracking on the X80 U-bend induced by D. vulgaris corresponds to slower crack propagation with higher THPS concentration. Open circuit potential (OCP), electrochemical impedance spectroscopy (EIS), linear polarization resistance (LPR), and potentiodynamic polarization results corroborated the increasing THPS concentration corresponding to decreasing MIC rate, which mitigate the SCC activity of X80 steel. Depending on the potentiodynamic polarization results, a theoretical calculation was formed to determine the adsorption mechanism between THPS and X80 U-bend. The standard Gibbs free energy of the adsorption process is −33.0 kJ/mol, which determines that the adsorption mechanism of THPS and X80 U-bend are both physical absorption and chemical absorption. Physical absorption is caused by the electrostatic effect between THPS and X80 U-bend and chemical absorption is caused by charge exchange between THPS and X80 U-bend. |
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