Structural Properties Ni20Cr10Al2Y Coatings for Geothermal Conditions

Buzaianu, Aurelian; Motoiu, P.; Csáki, Ioana; Ioncea, A.; Motoiu, Vlad

doi:10.3390/proceedings2231434

Cited by 7 publications

(5 citation statements)

References 15 publications

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“…In addition to the deposition methods, coating quality is also influenced by other spray parameters, namely the heat source, feedstock flowrate, standoff distance (SOD), suspension medium, fuel type (for HVOF), and injection mode (radial or axial) [45,48,49]. Buzaianu [50]. In another study, Zhang, F. et al utilised liquid feedstock-based HVOF to deposit various cermet (WC-CoCr and CrC-NiCr) and other alloys (Ni self-fluxing, and Fe-based amorphous), and examined their erosioncorrosion performance in geothermal environments.…”

Section: Thermal Spraymentioning

confidence: 99%

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A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

Bhuvanendran Nair Jayakumari,

Malik,

Mittal

et al. 2023

Coatings

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Geothermal energy is likely to be a significant contributor in achieving sustainable energy goals and net-zero emissions targets. Within geothermal power plants, heat exchangers play a critical role in harnessing this renewable energy source. However, these heat exchangers encounter significant challenges when exposed to geothermal fluids, including erosion, corrosion, and scaling, which adversely affects their performance and longevity. The current review focuses on surface engineering techniques, particularly coatings, as a highly effective and economically viable solution to address these challenges in geothermal heat exchangers. The review begins by providing an overview of geothermal energy, its significance in the context of sustainability and the important role played by heat exchangers in geothermal power generation, followed by the challenges and their impact on heat exchangers. The subsequent section focuses on surface engineering by coatings and its types employed to enhance the performance of heat exchangers. In the final part, the reader is presented with an overview of the challenges associated with the application of coatings in geothermal heat exchangers and potential future directions in this field. This review offers a detailed understanding of the critical role coatings play in improving the efficiency and service life of heat exchangers in geothermal power plants.

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Section: Thermal Spraymentioning

confidence: 99%

“…13, x FOR PEER REVIEW 12 of 29 carbon steel for geothermal environments[50]. In another study, Zhang, F. et al utilised liquid feedstock-based HVOF to deposit various cermet (WC-CoCr and CrC-NiCr) and other alloys (Ni self-fluxing, and Fe-based amorphous), and examined their erosion-corrosion performance in geothermal environments.…”

mentioning

confidence: 99%

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

Bhuvanendran Nair Jayakumari,

Malik,

Mittal

et al. 2023

Coatings

View full text Add to dashboard Cite

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“…Hence, poor heat transfer performance of standard heat exchangers compels the use of HXs with bigger size, making the CAPEX higher. The utilisation of carbon steels instead of CRAs will allow cheaper heat exchangers to be produced and will also increase their efficiency thanks to higher thermal conductivities [9].…”

Section: State Of the Art And Objectivesmentioning

confidence: 99%

Design and development of three test facilities to evaluate heat transfer performances of advanced and low cost materials and coatings for geothermal application

Pardelli¹,

Mannelli

Tempesti³

et al. 2021

E3S Web Conf.

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Geothermal energy is accredited as a flexible, controllable and green source of energy. Heat exchangers (HXs) are one of the most critical components of a geothermal power plant due to corrosion and scaling phenomena. Hence, improvements in the antiscaling and anticorrosion properties as well as heat transfer performance of the HX materials will lead to smaller, more efficient and less costly systems. EU H2020 GeoHex project relies on the use low-cost carbon steel-based material for HXs. Through modifying the surface with nano porous coating and controlling the surface chemistry, the heat transfer performance of single phase and phase change process will be improved. This paper presents the design and development of three lab scale test rigs to test the effectiveness of innovative materials and superficial treatments on heat exchange with geothermal brine in single, condensing and evaporating phases. The rigs have been equipped with all the necessary instrumentation for control and for data acquisition. In particular, the advanced coatings are applied on a small stainless-steel plate and R134a fluid has been used for heat transfer coefficient characterization in different phase conditions. GeoHex project has received funding from the European Union’s Horizon 2020 research and innovation programme. Grant agreement n.851917.

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“…In the past 50 years, different coatings for geothermal applications have been developed and tested in laboratories and on sites [9]. Several types of coatings have been tested in both simulated and real geothermal environments, including metallic [10], polymer (Teflon PFA, PTFE, polyurethane, epoxy, and other organic coatings) [9,11,12], and ceramic coatings [13]. Among these coatings, glass, glass-ceramic, and polymer-derived ceramic coatings stand out due to inert chemical properties, high-temperature resistance, and high mechanical properties [9].…”

Section: Introductionmentioning

confidence: 99%

Study of Al2O3 Sol-Gel Coatings on X20Cr13 in Artificial North German Basin Geothermal Water at 150 °C

et al. 2021

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Al2O3 has been widely used as a coating in industrial applications due to its excellent chemical and thermal resistance. Considering high temperatures and aggressive mediums exist in geothermal systems, Al2O3 can be a potential coating candidate to protect steels in geothermal applications. In this study, γ-Al2O3 was used as a coating on martensitic steels by applying AlOOH sol followed by a heat treatment at 600 °C. To evaluate the coating application process, one-, two-, and three-layer coatings were tested in the artificial North German Basin (NGB), containing 166 g/L Cl−, at 150 °C and 1 MPa for 168 h. To reveal the stability of the Al2O3 coating in NGB solution, three-layer coatings were used in exposure tests for 24, 168, 672, and 1296 h, followed by surface and cross-section characterization. SEM images show that the Al2O3 coating was stable up to 1296 h of exposure, where the outer layer mostly transformed into boehmite AlOOH with needle-like crystals dominating the surface. Closer analysis of cross-sections showed that the interface between each layer was affected in long-term exposure tests, which caused local delamination after 168 h of exposure. In separate experiments, electrochemical impedance spectroscopy (EIS) was performed at 150 °C to evaluate the changes of coatings within the first 24 h. Results showed that the most significant decrease in the impedance is within 6 h, which can be associated with the electrolyte penetration through the coating, followed by the formation of AlOOH. Here, results of both short-term EIS measurements (up to 24 h) and long-term exposure tests (up to 1296 h) are discussed.

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Structural Properties Ni20Cr10Al2Y Coatings for Geothermal Conditions

Cited by 7 publications

References 15 publications

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

A Review on Geothermal Heat Exchangers: Challenges, Coating Methods, and Coating Materials

Design and development of three test facilities to evaluate heat transfer performances of advanced and low cost materials and coatings for geothermal application

Study of Al2O3 Sol-Gel Coatings on X20Cr13 in Artificial North German Basin Geothermal Water at 150 °C

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