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While dedicated hydrogen pipelines have been present on the Gulf Coast of the US for decades, new application opportunities are opening up for transportation of hydrogen as a greener fuel. Some opportunities may be for newly built transportation lines while others may use existing natural gas pipelines that are converted to wholly or partially carry hydrogen. A normal part of operating a pipeline system is reconfiguring the system to add new pipes by making tie-in welds joining the new pipe to the wall of the existing pipe.
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Buried steel pipelines operating in soil environments are constantly under threat from corrosion, a phenomenon which jeopardizes their structural integrity and escalates the risk of material degradation, leakage, and subsequent environmental hazards. A holistic understanding of the corrosion process in soil environments is essential for strengthening infrastructural resilience and upholding environmental sustainability.
Corrosion of metals in soils is dictated by a complex confluence of several factors, including aeration, pH, moisture content, ionic composition, electrical resistivity, and microbial activity1.
Intergranular Stress Corrosion Cracking (IG-SCC) plays an important role as one of the most recognized degradation phenomena in Nuclear Power Plants (NPP). SCC is both multi-disciplinary with many parameters that are dependent on each other. This study was based on developing a multi-physics finite element model for IG-SCC prediction in unirradiated structural materials for non-pressure vessel components in NPPs. The environment considered was boiling water reactor (BWR) with normal water chemistry (NWC), containing approx. 200ppb oxidant (O2 + H2O2) and varying aggressive ions Cl-. The model was focused on the slip-oxidation model, where a crack is advancing by anodic dissolution, passivation, and oxide rupture at the crack tip. The rupture of the oxide film is due to the constant stresses applied creating slips in the bulk material which fractures the oxide.
A homogeneous mixture of two immiscible polymeric binders were dissolved in a common solvent or a mixture of solvents was applied as a thin film. The first polymeric binder was a bisphenol-A (BPA) based epoxide, epoxide modified with tetraethoxysilane (TEOS) oligomer, or phosphated epoxide. The second polymeric binder was a fluorinated acrylic copolymer.