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Sol-gel coatings in the field of corrosion prevention are also available. To date, only a small amount of research has been done in determining the effect of hybrid sol-gel coatings on abrasion and cavitation erosion of AA2024-T3. The present research investigates the effects of thickness of the coatings on the morphology, oxidation, abrasion, and cavitation erosion characteristics of the finished hybrid sol-gel coatings deposited on AA2024-T3 surfaces. From 3-trimethoxysilylpropylmethacrylate, and a zirconium complex made from the chelation of zirconium n-propoxide and methacrylic acid, a hybrid sol-gel was synthesized. Single-dip, double-dip, and triple-dip were coated on AA-2024 T3s, coating them with single-dip, double-dip, and triple-dip. The coatings' corrosion resistance was investigated using Open Circuit Potential and Potentiodynamic polarization. The multilayer coated samples improved AA2024-T3's corrosion, cavitation erosion, and abrasion resistance, according to the researchers. Hence, the ready silica-based coatings can be used as a potential substitute for marine renewable energy applications.
Source link: https://doi.org/10.3390/cmd3040036
The results revealed that with an increase in crosslinking density, the tensile strength of PUx increased first and then reduced, elongation at break and water absorption decreased slowly, and thermal decomposition temperature and adhesion strength increased gradually. During the CE process, the degree of microphase separation and made brittle hard segments brittle; meanwhile, cavitation heat accelerated hydrolysis, pyrolysis, oxidation, and molecular chains' fracture. PU0. 4 provided the highest CE resistance among the five coatings thanks to its extensive coatings and may have future applications on the surface of hydraulic components.
Source link: https://doi.org/10.3390/ma15228204
Abstract Cavitation erosion is a common occurrence that occurs in hydraulic turbine blades and results in mass loss. Welding is the most common technique used to restore these cavitation-eroded turbine blades' geometrical appearance, although it is also known that tensile residual strain can occur. The development of a manufacturing process that could reduce or eliminate the residual stress level will contribute to a longer service life for this component. Splashing droplets have triggered higher school loss in several localized areas because they reduce intersplat cohesion.
Source link: https://doi.org/10.31399/asm.cp.itsc2011p0902
Abstract : Hydraulic components such as turbines, valves, pumps, and ship propellers are all susceptible to erosion. The possibility of using Arc thermal spray processing for hydraulic blade runners maintenance is also available. The best cavitation resistance was obtained in Fe-Mn-Si alloy with a nickel addition; this composition has less oxide and splash droplets content, and shows improved splat wetting than Fe-Mn-Cr-Si without nickel; During cavitation experiments, Strain-induced phase transformation occurred in arc thermally sprayed coatings. After cavitation results, improved results for Fe-Mn-Si alloys, without nickel, were obtained in alloys with higher strain-induced martensite contents.
Source link: https://doi.org/10.31399/asm.cp.itsc2011p0332
The physics and mechanisms are still lacking information, with the synergy of cavitation and sediment erosion being the most severe damage in hydraulic machinery in sediment-laden rivers. Cavitation and sediment erosion's synergy affects hydraulic machinery's performance and life, as well as increasing costs in operation and maintenance. An increasing number of new hydropower stations and water diversion schemes are currently planned or under construction, the majority of which are in sediment-laden rivers, as a result of rapid development of renewable energy and the transformation of water resources.
Source link: https://doi.org/10.3389/fenrg.2022.1047984
However, the FeCrMnBC alloy's suitability as coating for cast iron under varying erosive and corrosive conditions in particle-loaded fluids for pump parts has yet to be investigated. Particularly the effect of three-cathode plasma spraying coatings applied with various process parameters such as standoff distance and spray angle is in the point of concern. In a pump test rig containing 10 wt. -% corundum particles, erosion corrosion behavior has been investigated. The reduction of spray angle and the variation of stand-off distance limit the corrosion and cavitation resistance in several ways. The results show that the decrease of spray angle and the variation of stand-off distance limit the corrosion and cavitation resistance in various ways. Even under non optimized conditions, the FeCrMnBC coatings exhibit high process stability for the selected parameter combinations, as well as a large potential to increase the stability of cast iron.
Source link: https://doi.org/10.31399/asm.cp.itsc2017p0483
Abstract Cavitation erosion damage, which occurs in the main parts of a hydroelectric power generation machine, is one of the key problems. The ultrasonic vibration tests were performed to establish CE property of the WC-cermet coatings, and volume loss was measured as CE damage was determined. The fragment that was spalled from the surface after the CE test was found in this study was almost flake-like shape, with the length ranging from 2u00b5 million to 50u00b5 million, according to the results. This fragment contained both WC particle and metal binder, according to a SEM report, which means that both WC particle and metal binder were still tightly embedded together, which means that both WC particle and metal binder were also closely bound together. It was also revealed that the volume loss could have more to fracture hardness KIC rather than Vickers' hardness. CE damage was deemed that the damage had been increased to the point by throwing out the fragment that had arisen from micro crack initiation.
Source link: https://doi.org/10.31399/asm.cp.itsc2017p0153
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