Short-term exposure tests of ɣ-Al2O3 Sol-gel coating on X20Cr13 in artificial geothermal waters with different pH

Aristia, Gabriela; Bäßler, Ralph; Nofz, Marianne; Sojref, Regine; Kohl, Anka

doi:10.1016/j.geothermics.2021.102193

Cited by 4 publications

(3 citation statements)

References 30 publications

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“…For aluminum, the corrosion mostly occurred by pitting, with a large number of pits that are formed and filled with a mixture of Al 2 O 3 , Al(OH) 3, and Al 2 (SO 4 ) 3 . The resistance of different phases of alumina in salty water has been reported in several studies [ 16 ]. The defective nature of the oxide is usually responsible for the corrosion of the protected metal.…”

Section: Resultsmentioning

confidence: 99%

Stabilization of Copper-Based Biochips with Alumina for Biosensing Application

Beydoun

Niberon

Arnaud³

et al. 2022

Biosensors

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Surface plasmon resonance devices typically rely on the use of gold-coated surfaces, but the use of more abundant metals is desirable for the long-term development of plasmonic biochips. As a substitute for gold, thin copper films have been deposited on glass coverslips by thermal evaporation. As expected, these films immersed in a water solution initially exhibit an intense plasmonic resonance comparable to gold. However, without protection, an angle-resolved optical analysis shows a rapid degradation of the copper, characterized by a continuous angular shift of the plasmonic resonance curve. We show that copper films protected with a thin layer of aluminum oxide of a few nanometers can limit the oxidation rate for a sufficient time to perform some standard measurements. As the process is simple and compatible with the current biochip production technique, such an approach could pave the way for the production of alternative and more sustainable biochips.

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Section: Resultsmentioning

confidence: 99%

Stabilization of Copper-Based Biochips with Alumina for Biosensing Application

Beydoun

Niberon

Arnaud³

et al. 2022

Biosensors

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“…The sol-gel method is a versatile approach for the formulation of inorganic or hybrid coatings, with applicability through various procedures like dipping, spraying, or spinning [73]. This method offers numerous advantages, including low deposition temperature, production of homogenous coatings, and good control over both metal concentration and coating thickness, and permits the addition of reducing and oxidizing agents in small quantities [74].…”

Section: Sol-gel Methodsmentioning

confidence: 99%

“…Schulz et al [75] and Nofz et al [76] highlighted the protective nature of Al 2 O 3 sol-gel coatings in environments characterized by high-temperature flue gas and the presence of NaCl, respectively. Since, geothermal environments often exhibit elevated temperatures and salinity levels, Aristia, G. et al explored the potential application of Al 2 O 3 sol-gel coating for safeguarding martensitic steels in such geothermal conditions and concluded that these coatings offered a bright future in providing corrosion protection in geothermal environments with a neutral pH [73]. Zhang, F. et al performed experiments to observe anti-fouling on silica-and titania-coated plate heat exchangers in 80 • C simulated geothermal water.…”

Section: Sol-gel Methodsmentioning

confidence: 99%

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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