TY - JOUR
T1 - Nanobubbles as corrosion inhibitor in acidic geothermal fluid
AU - Aikawa, Asuki
AU - Kioka, Arata
AU - Nakagawa, Masami
AU - Anzai, Satoshi
N1 - Funding Information:
The authors are grateful to A. Ueda, T. Yokoyama, R. Itoi, K. Yonezu, Y. Kiyota, K. Tagomori, and T. Kodama for discussion and their help throughout the work presented in the manuscript. The manuscript benefited from constructive comments by three anonymous reviewers. This work was partly supported by the project “Research and development of geothermal power generation technology — Development of technology for advanced use of geothermal energy — Development of chemical processing systems to properly utilize and brine” from the New Energy and Industrial Technology Development Organization (NEDO), Japan. A.K. acknowledges financial support from the New Frontiers in Engineering Research, Kyushu University ( FY2020-2021 ).
Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2021/1
Y1 - 2021/1
N2 - Metallic corrosion is a major issue that leads to an efficiency loss and eventual failure of the system in geothermal power plants. Despite the growing understanding of mechanisms of corrosion, inhibiting steel corrosion in the acidic geothermal fluids, remains to present formidable challenges due to its intrinsic physicochemical complexity. Here, we study the use of nanobubbles as a possible corrosion inhibitor by testing alteration of the low-carbon steel plates immersed in acidic geothermal water with continuously injected air-nanobubbles. Nanobubbles have been used in a broad range of areas as they are eco-friendly, low-cost, easy-to-use and high-functional materials. We, for the first time to our knowledge, found that air-nanobubbles could inhibit steel corrosion, with inhibition efficiency of up to 50 % in the studied acidic geothermal fluid. Air-nanobubbles could act as a nanoscopic coating material in the acidic geothermal fluid, through generating a bubble mattress and/or promoting nucleation and aggregation of a very small quantity of silica precipitation on the surface of steel plates. Our finding suggests that nanobubbles can inhibit steel corrosion in various chemically different geothermal fluids, highlighting the physicochemical significance of nanobubbles as the coating material for inhibiting metal degradation in the geothermal infrastructures.
AB - Metallic corrosion is a major issue that leads to an efficiency loss and eventual failure of the system in geothermal power plants. Despite the growing understanding of mechanisms of corrosion, inhibiting steel corrosion in the acidic geothermal fluids, remains to present formidable challenges due to its intrinsic physicochemical complexity. Here, we study the use of nanobubbles as a possible corrosion inhibitor by testing alteration of the low-carbon steel plates immersed in acidic geothermal water with continuously injected air-nanobubbles. Nanobubbles have been used in a broad range of areas as they are eco-friendly, low-cost, easy-to-use and high-functional materials. We, for the first time to our knowledge, found that air-nanobubbles could inhibit steel corrosion, with inhibition efficiency of up to 50 % in the studied acidic geothermal fluid. Air-nanobubbles could act as a nanoscopic coating material in the acidic geothermal fluid, through generating a bubble mattress and/or promoting nucleation and aggregation of a very small quantity of silica precipitation on the surface of steel plates. Our finding suggests that nanobubbles can inhibit steel corrosion in various chemically different geothermal fluids, highlighting the physicochemical significance of nanobubbles as the coating material for inhibiting metal degradation in the geothermal infrastructures.
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U2 - 10.1016/j.geothermics.2020.101962
DO - 10.1016/j.geothermics.2020.101962
M3 - Article
AN - SCOPUS:85091673472
VL - 89
JO - Geothermics
JF - Geothermics
SN - 0375-6505
M1 - 101962
ER -