Abdeen Dana H, Atieh Muataz A, Merzougui Belabbes
Sustainable Development Division, College of Science and Engineering, Hamad Bin Khalifa University, Doha P.O. Box 34110, Qatar.
Department of Chemical Engineering, College of Engineering, Qatar University, Doha P.O. Box 2713, Qatar.
Materials (Basel). 2020 Dec 30;14(1):119. doi: 10.3390/ma14010119.
The inhibition behavior of carbon nanotubes (CNTs) and Gum Arabic (GA) on the corrosion of 316L stainless steel in CNTs-water nanofluid under the effect of different temperatures was investigated by electrochemical methods and surface analysis techniques. Thereby, 316L stainless steel samples were exposed to CNTs-water nanofluid under temperatures of 22, 40, 60 and 80 °C. Two concentrations of the CNTs (0.1 and 1.0 wt.% CNTs) were homogenously dispersed in deionized water using the surfactant GA and tested using three corrosion tests conducted in series: open circuit test, polarization resistance test, and potentiodynamic scans. These tests were also conducted on the same steel but in solutions of GA-deionized water only. Tests revealed that corrosion increases with temperature and concentration of the CNTs-water nanofluids, having the highest corrosion rate of 32.66 milli-mpy (milli-mil per year) for the 1.0 wt.% CNT nanofluid at 80 °C. In addition, SEM observations showed pits formation around areas of accumulated CNTs that added extra roughness to the steel sample. The activation energy analysis and optical surface observations have revealed that CNTs can desorb at higher temperatures, which makes the surface more vulnerable to corrosion attack.
采用电化学方法和表面分析技术，研究了碳纳米管（CNTs）和阿拉伯树胶（GA）在不同温度影响下对316L不锈钢在CNTs-水纳米流体中腐蚀的抑制行为。因此，将316L不锈钢样品暴露于22、40、60和80℃温度下的CNTs-水纳米流体中。使用表面活性剂GA将两种浓度的CNTs（0.1和1.0 wt.% CNTs）均匀分散在去离子水中，并通过串联进行的三项腐蚀试验进行测试：开路试验、极化电阻试验和动电位扫描。这些试验也在同一钢材上进行，但仅在GA-去离子水溶液中进行。试验表明，腐蚀随CNTs-水纳米流体的温度和浓度增加而增加，在80℃下，1.0 wt.% CNT纳米流体的腐蚀速率最高，为32.66密耳/年（每年密耳）。此外，扫描电子显微镜观察显示，在碳纳米管聚集区域周围形成了凹坑，这增加了钢样品的粗糙度。活化能分析和光学表面观察表明，碳纳米管在较高温度下会解吸，这使得表面更容易受到腐蚀攻击。
