Suleiman Rami K, Adesina Akeem Y, Olalekan Ogunlakin Nasirudeen, Kumar Arumugam Madhan, Al-Badour Fadi A, Subbaiah Sowrirajan
Interdisciplinary Research Center for Advanced Materials, King Fahd University of Petroleum & Minerals (KFUPM), Dhahran 31261, Saudi Arabia.
Mechanical Engineering Department, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran 31261, Saudi Arabia.
Polymers (Basel). 2023 Jun 27;15(13):2842. doi: 10.3390/polym15132842.
This article presents the synthesis of a novel hybrid sol-gel coating and its functionalization with various waste material additives. The unmodified and modified hybrid coatings were deposited on mild steel (MS) substrates, and their anticorrosion performance in a 3.5 wt.% sodium chloride corrosive environment was assessed using potentiodynamic polarization and impedance electrochemical techniques. The Fourier Transformed Infrared Spectrometry (FTIR) spectral, thermal, surface-roughness, scratch-resistance, and contact-angle characterizations were also conducted on the fabricated coatings. Electrochemical techniques proved that the coating sample loaded with the limestone additive showed the best anticorrosion behavior in the saline environment after 4 weeks of exposure. Moreover, the obtained morphological analysis data indicated better surface integrity and cross-link density for this sample compared to other waste-modified coatings. Conversely, the tire rubber and activated carbon additives showed a severe negative impact on the thermal, mechanical, and barrier properties of the parent coating, which can be attributed to the high porosity and less integrated natures of these modified coating formulations proved by their morphological images. Still, all loaded waste additives to the hybrid coating have enhanced its adhesion to the steel surface, as indicated by scratch resistance testing. Overall, the results of the present study show the need for maintaining a balance between the economic value of the modification methodology of hybrid coatings and the type of the loaded waste material additive.
本文介绍了一种新型杂化溶胶-凝胶涂层的合成及其用各种废料添加剂进行的功能化处理。将未改性和改性的杂化涂层沉积在低碳钢（MS）基材上，并使用动电位极化和阻抗电化学技术评估它们在3.5 wt.%氯化钠腐蚀环境中的防腐性能。还对制备的涂层进行了傅里叶变换红外光谱（FTIR）光谱、热性能、表面粗糙度、耐刮性和接触角表征。电化学技术证明，添加石灰石添加剂的涂层样品在暴露4周后在盐环境中表现出最佳的防腐性能。此外，获得的形态分析数据表明，与其他废料改性涂层相比，该样品具有更好的表面完整性和交联密度。相反，轮胎橡胶和活性炭添加剂对母体涂层的热性能、机械性能和阻隔性能产生了严重的负面影响，这可归因于这些改性涂料配方的高孔隙率和较低的整体性质，其形态图像证明了这一点。不过，耐刮性测试表明，所有添加到杂化涂层中的废料添加剂都增强了其与钢表面的附着力。总体而言，本研究结果表明，需要在杂化涂层改性方法的经济价值与负载废料添加剂的类型之间保持平衡。
