Centre of Research Excellence in Corrosion, Research Institute, King Fahd University of Petroleum and Minerals, Dhahran, 31261, Saudi Arabia.
Environ Sci Pollut Res Int. 2021 Aug;28(30):40879-40894. doi: 10.1007/s11356-021-13567-5. Epub 2021 Mar 26.
Date palm leaves (DPL) was extracted using acetone (ACE), ethanol (ETH), aqueous (AE), butanol (BUT), methanol (METH), isopropanol (ISO), and ethyl acetate (EHY ACT). The extracts were characterized using Fourier-transform infrared spectroscopy (FTIR) and ultraviolet-visible (UV-vis) spectroscopy. The various solvent DPL extracts were screened for anticorrosion property against low carbon steel in 15 wt.% HCl solution at 25 °C. ACE, AE, and ETH DPL extracts are found to promote the corrosion of the low carbon steel while BUT, ISO, METH, and EHY ACT DPL extracts exhibit anticorrosion property. However, BUT DPL extract shows the best anticorrosion property with 400 ppm protecting the low carbon steel by 82%. Based on the results from the screening experiments, BUT extract was selected for a comprehensive corrosion inhibition study. Inhibition effectiveness of BUT DPL extract is found to increase with increasing concentration with 1000 ppm affording 97% protection at 25 °C. The inhibition performance increases up to 40 °C but slightly decreases as the temperature was raised to 50 °C and 60 °C. However, BUT DPL extract could afford 86% protection at 60 °C. Scanning electron microscope and atomic force spectroscopy results confirm that BUT DPL extract is indeed an effective inhibitor for X60 carbon steel in 15 wt.% HCl solution.
椰枣叶分别用丙酮（ACE）、乙醇（ETH）、水（AE）、正丁醇（BUT）、甲醇（METH）、异丙醇（ISO）和乙酸乙酯（EHY ACT）进行提取。用傅里叶变换红外光谱（FTIR）和紫外可见（UV-vis）光谱对提取物进行了表征。在 25°C 的 15wt% HCl 溶液中，对各种溶剂的椰枣叶提取物进行了低碳钢的防腐性能筛选。ACE、AE 和 ETH 椰枣叶提取物会促进低碳钢的腐蚀，而 BUT、ISO、METH 和 EHY ACT 椰枣叶提取物则具有防腐性能。然而，BUT 椰枣叶提取物的防腐性能最佳，在 400ppm 时可使低碳钢的腐蚀减少 82%。基于筛选实验的结果，选择了 BUT 提取物进行全面的腐蚀抑制研究。BUT 椰枣叶提取物的抑制效果随着浓度的增加而增加，在 25°C 时，1000ppm 的浓度可提供 97%的保护。在 40°C 时，抑制性能增加，但当温度升高到 50°C 和 60°C 时，抑制性能略有下降。然而，BUT 椰枣叶提取物在 60°C 时仍可提供 86%的保护。扫描电子显微镜和原子力光谱结果证实，BUT 椰枣叶提取物确实是 X60 碳钢在 15wt% HCl 溶液中的有效抑制剂。
