Nanobubbles as corrosion inhibitor in acidic geothermal fluid

被引:23
作者
Aikawa, Asuki [1 ,5 ]
Kioka, Arata [1 ,4 ]
Nakagawa, Masami [1 ,2 ]
Anzai, Satoshi [3 ]
机构
[1] Kyushu Univ, Dept Earth Resources Engn, Fukuoka 8190395, Japan
[2] Colorado Sch Mines, Dept Min Engn, Golden, CO 80401 USA
[3] Anzaikantetsu Co Ltd, MCS Div, Yokohama, Kanagawa, Japan
[4] Leopold Franzens Univ Innsbruck, Inst Geol, Innsbruck, Austria
[5] Saibu Gas Co Ltd, Gas Resources Dept, Fukuoka, Japan
关键词
Nanobubbles; Steel corrosion; Corrosion inhibitor; Acidic geothermal fluid; Bubble mattress; Silica; Nano; Particle;
D O I
10.1016/j.geothermics.2020.101962
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
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.
引用
收藏
页数:9
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