Zhihao Zhao,Shuangqing Sun,Chunling Li,Songqing Hu
Pipeline steels are among the most common engineering materials and are used extensively in various industries. Therefore, it is essential that these materials are hydrophobic and corrosion resistant . Herein, a simple method to prepare a superhydrophobic coating on X65 steel is proposed. Firstly, the black oxide coating (BO) was grown in situ on X65 steel surface, utilizing its morphology advantage to build the micro-nano structure, where they showed a water contact angle (WCA) of 158°. After fluorination, the WCA of the coating increased to 163°. The prepared superhydrophobic samples were exposed to air and salt spray test for a 30-day durability study, where the long-lasting superhydrophobicity of the coating demonstrated its wide applicability. In addition, the coating also exhibited excellent corrosion resistance and self-cleaning property. This work provides a simple and low-cost technique for designing superhydrophobic coatings on steels.
Addressing the urgent need to mitigate pipeline obstruction caused by natural gas hydrate adhesion we present a novel approach utilizing a spin coating/spray coating technique to develop an effective anti-adhesion coating. Drawing inspiration from the three-layer structure of cat claws, this coating was meticulously characterized alongside modified nanoparticles using XRD , XPS, SEM , and AFM. Assessment of cyclopentane hydrate adhesion employed micromechanical force technique, while the stability of the coating underwent rigorous scrutiny through sand washing tests. Additionally, the proportion of the buffer layer was fine-tuned using Abaqus finite element simulation software. Furthermore, electrochemical methods were employed to evaluate the coating's corrosion resistance . Moreover, we propose a molecular dynamics model for the developed TBPC coating, dissecting its anti-adhesion and anti-corrosion properties. Comparative analysis revealed a remarkable 99.2 % reduction in adhesion force compared to the bare steel surface of X65. Following a 70-day immersion in a 3.5 wt% NaCl solution, the impedance value was measured at 5.5 × 10 6 Ω·cm 2 . Notably, the coating exhibited exceptional superhydrophobic characteristics, with a contact angle of 166.4° and a rolling angle of 6.9° under ambient temperature and pressure conditions. This innovative strategy promises to enhance pipeline hydrodynamic efficiency, reduce energy consumption and ensure the safe transport of hydrates.
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