Almufarij Rasmiah Saad, Fetouh El Sayed Howida Abouel, Mohamed Mohamed Elshahat
Department of Chemistry, College of Science, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia.
Chemistry Department, Faculty of Science, Alexandria University, Alexandria 21568, Alexandria Governorate, Egypt.
Materials (Basel). 2023 Jun 30;16(13):4728. doi: 10.3390/ma16134728.
In this paper, we present a sustainable approach for the creation of superhydrophobic (SP) coating on a stainless-steel substrate based on a biological metal-organic framework (MOF). The MOF was synthesized using aspartic acid as a linker and copper ions as a core metal. Two SP coatings were well constructed on stainless steel utilizing electrodeposition of nickel (Ni) and nickel altered by MOF (Ni@Bio-MOF) coatings followed by soaking in a solution of stearic acid in ethanol. The results of Fourier transform infrared spectroscopy demonstrate that the stearic acid-grafted nickel coating (Ni@SA) and the stearic acid-grafted Ni@Bio-MOF composite (Ni@Bio-MOF@SA), were effectively deposited on the stainless steel. The wettability findings displayed that the water contact angle of Ni@SA and Ni@Cu-As MOF@SA are 160° ± 1.1°, and 168° ± 1.2°, respectively. The prepared SP coating was also found to be chemically and mechanically stable. The results show that the Ni@SA coating maintains SP characteristics in a pH range of 3-11 while the Ni@Cu-As MOF@SA coating retained SP characteristics in a pH range of 1-13. Additionally, the superhydrophobic Ni@SA coating demonstrated SP characteristics up to a length of abrasion equal to 1300 mm, while the Ni@Cu-As MOF@SA coating exhibited SP characteristics up to a length of abrasion equal to 2700 mm. Furthermore, the Ni@SA and Ni@Cu-As MOF@SA coatings exhibited significantly improved corrosion protection in a 0.5 M NaCl solution compared with bare stainless steel, with protection efficiencies of approximately 94% and 99%, respectively. The results of this study demonstrate that the proposed approach is a promising method for the fabrication of eco-friendly and corrosion-resistant SP coatings on stainless steel substrate.
在本文中，我们提出了一种基于生物金属有机框架（MOF）在不锈钢基底上制备超疏水（SP）涂层的可持续方法。该MOF以天冬氨酸作为连接体、铜离子作为核心金属合成。利用镍（Ni）和经MOF改性的镍（Ni@Bio-MOF）涂层的电沉积，随后浸泡在硬脂酸的乙醇溶液中，在不锈钢上成功构建了两种SP涂层。傅里叶变换红外光谱结果表明，硬脂酸接枝的镍涂层（Ni@SA）和硬脂酸接枝的Ni@Bio-MOF复合材料（Ni@Bio-MOF@SA）有效地沉积在了不锈钢上。润湿性研究结果显示，Ni@SA和Ni@Cu-As MOF@SA的水接触角分别为160°±1.1°和168°±1.2°。还发现制备的SP涂层具有化学和机械稳定性。结果表明，Ni@SA涂层在pH值为3 - 11的范围内保持SP特性，而Ni@Cu-As MOF@SA涂层在pH值为1 - 13的范围内保持SP特性。此外，超疏水的Ni@SA涂层在磨损长度达到1300 mm时仍表现出SP特性，而Ni@Cu-As MOF@SA涂层在磨损长度达到2700 mm时仍表现出SP特性。此外，与裸不锈钢相比，Ni@SA和Ni@Cu-As MOF@SA涂层在0.5 M NaCl溶液中表现出显著增强的耐腐蚀性能，保护效率分别约为94%和99%。本研究结果表明，所提出的方法是在不锈钢基底上制备环保且耐腐蚀的SP涂层的一种有前景的方法。
