Effect of strain rate on stress corrosion cracking of X100 pipeline steel in environments with sulfate-reducing bacteria
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Abstract
Pipelines installed in the seabed for long periods suffer from high stress levels, and the sea mud environment is complex because it contains various microorganisms that make pipelines prone to stress corrosion cracking (SCC). In this study, a self-designed stress electrochemical corrosion test device was adopted to ensure the normal growth and metabolism of sulfate-reducing bacteria (SRB). The effects of strain rate on the SCC behavior of X100 pipeline steel with SRB in a simulation solution of sea mud from the South China Sea were studied using the slow strain rate test, electrochemical impedance spectroscopy, and scanning electron microscopy fractography. Results show that SRB can promote the stress corrosion susceptibility of X100 pipeline steel. As strain rate increases, the stress corrosion susceptibility decreases in general. When the strain rate is 5 × 10−7 × s−1, the stress corrosion susceptibility is largest and SCC occurs. Under the impact of SRB and strain rate, the stress corrosion fracture mechanism is hydrogen embrittlement mechanism. With the increase in strain rate, the effect of SRB becomes weak and the stress corrosion susceptibility shows a decreasing trend in general. Consequently, SCC does not occur in the specimen and the fracture is dominated by mechanical factors.
Kurzfassung
Pipelines, die auf dem Meeresgrund über lange Zeit installiert sind, sind hohen Spannungsniveaus ausgesetzt. Die Umgebung am Meeresboden ist komplex, da sie verschiedene Mikroorganismen enthält, die Pipelines anfällig für eine Spannungsrisskorrosion (Stress Corrosion Cracking – SCC) machen können. In der diesem Beitrag zugrunde liegenden Studie wurde eine Eigenentwicklung eines Versuchsaufbaus zur Abbildung der Spannungen und Umgebungen angewandt, um das normale Wachstum und den Metabolismus von sulfatreduzierenden Bakterien (Sulfate Reducing Bacteria – SRB) sicherzustellen. Die Auswirkungen der Dehnrate auf das SCC-Verhalten des X100 Pipelinestahles unter SRB-Exposition in einer Lösung, die den Meeresboden der Südlichen Chinesischen See simulierte, wurden mittels des Slow Strain Rate Tests, elektrochemischer Impedanzspektroskopie und rasterelektronenmikroskopischer Fraktografie untersucht. Die Ergebnisse zeigen, dass SRB die SCC-Anfälligkeit des X100 Pipelinestahles unterstützen können. Wenn die Dehnrate zunimmt, nimmt die Risskorrosionsanfälligkeit allgemein ab. Bei einer Dehnrate von 5 × 10−7 × s−1 ist die SCC-Anfälligkeit am größten und es tritt auch SCC auf. Unter der Wirkung der SRB und dieser Dehnrate entspricht der Mechanismus der Risskorrosion dem einer wasserstoffunterstützten Rissbildung. Mit zunehmender Dehnrate wird der Effekt der SRB geschwächt, und die SCC-Anfälligkeit zeigt allgemein einen abnehmenden Trend. Somit tritt auch keine Spannungsrisskorrosion in der Probe auf, und der Bruch ist durch die mechanischen Einflussfaktoren bestimmt.
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© 2018, Carl Hanser Verlag, München
Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Effect of strain rate on stress corrosion cracking of X100 pipeline steel in environments with sulfate-reducing bacteria
- Influence of microstructural parameters of indefinite chill alloys on flexural strength and Young's modulus
- Corrosion behavior of a 3 % Cr tubing steel in a CO2 saturated high-salinity brine
- Comparative study of the testing approaches for the susceptibility of high-strength fasteners to environmental hydrogen embrittlement (EHE)
- Combined impact of UV radiation and nitric acid on HDPE containers during outdoor exposure
- Analysis of wear properties of Zn-based composites using the Taguchi method
- Microstructural and mechanical properties of friction and MIAB welded carbon steel tubes and forging bracket joints
- Influence of sintering temperature on mechanical properties of spark plasma sintered pre-alloyed Ti-6Al-4 V powder
- Ultrasound on-line measurement of pulverized coal flow in coal-fired boilers
- Comparison of seismic performance between thermal insulation concrete and normal concrete shear walls
- Test procedure for stress damage of ferromagnetic materials based on metal magnetic memory effects
- Lightweight design of an automobile hinge component using glass fiber polyamide composites
- Comparison of grey wolf, whale, water cycle, ant lion and sine-cosine algorithms for the optimization of a vehicle engine connecting rod
- Influence of a stepped feed rate on burr formation when drilling Al-5005
- Relationship between extrusion temperature and corrosion resistance of magnesium alloy AZ61
Articles in the same Issue
- Inhalt/Contents
- Contents
- Fachbeiträge/Technical Contributions
- Effect of strain rate on stress corrosion cracking of X100 pipeline steel in environments with sulfate-reducing bacteria
- Influence of microstructural parameters of indefinite chill alloys on flexural strength and Young's modulus
- Corrosion behavior of a 3 % Cr tubing steel in a CO2 saturated high-salinity brine
- Comparative study of the testing approaches for the susceptibility of high-strength fasteners to environmental hydrogen embrittlement (EHE)
- Combined impact of UV radiation and nitric acid on HDPE containers during outdoor exposure
- Analysis of wear properties of Zn-based composites using the Taguchi method
- Microstructural and mechanical properties of friction and MIAB welded carbon steel tubes and forging bracket joints
- Influence of sintering temperature on mechanical properties of spark plasma sintered pre-alloyed Ti-6Al-4 V powder
- Ultrasound on-line measurement of pulverized coal flow in coal-fired boilers
- Comparison of seismic performance between thermal insulation concrete and normal concrete shear walls
- Test procedure for stress damage of ferromagnetic materials based on metal magnetic memory effects
- Lightweight design of an automobile hinge component using glass fiber polyamide composites
- Comparison of grey wolf, whale, water cycle, ant lion and sine-cosine algorithms for the optimization of a vehicle engine connecting rod
- Influence of a stepped feed rate on burr formation when drilling Al-5005
- Relationship between extrusion temperature and corrosion resistance of magnesium alloy AZ61