Birdeanu Mihaela, Fratilescu Ion, Epuran Camelia, Murariu Alin Constantin, Socol Gabriel, Fagadar-Cosma Eugenia
National Institute for Research and Development in Electrochemistry and Condensed Matter, Plautius Andronescu Street 1, 300224 Timisoara, Romania.
Institute of Chemistry "Coriolan Dragulescu", Mihai Viteazu Ave. 24, 300223 Timisoara, Romania.
Nanomaterials (Basel). 2022 Mar 28;12(7):1118. doi: 10.3390/nano12071118.
The purpose of this research is to meet current technical and ecological challenges by developing novel steel coating systems specifically designed for mechanical equipment used in aggressive acid conditions. Homogeneous sandwich-type layered films on the surface of steel electrodes were realized using a pseudo-binary oxide, MnTaO, and two different substituted porphyrin derivatives, namely: 5-(4-carboxy-phenyl)-10,15,20-tris (4-methyl-phenyl)-porphyrin and 5-(4-methyl-benzoate)-10,15,20-tris (4-methyl-phenyl)-porphyrin, which are novel investigated compound pairs. Two suitable laser strategies, pulsed laser deposition (PLD) and matrix-assisted pulsed laser evaporation (MAPLE), were applied in order to prevent porphyrin decomposition and to create smooth layers with low porosity that are extremely adherent to the surface of steel. The electrochemical measurements of corrosion-resistant coating performance revealed that in all cases in which the steel electrodes were protected, a significant value of corrosion inhibition efficiency was found, ranging from 65.6 to 83.7%, depending on the nature of the porphyrin and its position in the sandwich layer. The highest value (83.7%) was obtained for the MAPLE/PLD laser deposition of 5-(4-carboxy-phenyl)-10,15,20-tris (4-methyl-phenyl)-porphyrin/MnTaO(h), meaning that the inhibitors adsorbed and blocked the access of the acid to the active sites of the steel electrodes.
本研究的目的是通过开发专门为在强酸性条件下使用的机械设备设计的新型钢涂层系统，来应对当前的技术和生态挑战。使用伪二元氧化物MnTaO以及两种不同的取代卟啉衍生物，即5-(4-羧基苯基)-10,15,20-三(4-甲基苯基)-卟啉和5-(4-甲基苯甲酸酯)-10,15,20-三(4-甲基苯基)-卟啉，在钢电极表面实现了均匀的三明治型层状薄膜，这两种化合物是新研究的化合物对。为了防止卟啉分解并形成具有低孔隙率且与钢表面极度粘附的光滑层，应用了两种合适的激光策略，即脉冲激光沉积(PLD)和基质辅助脉冲激光蒸发(MAPLE)。耐腐蚀涂层性能的电化学测量表明，在所有保护钢电极的情况下，都发现了显著的缓蚀效率值，根据卟啉的性质及其在三明治层中的位置，该值在65.6%至83.7%之间。对于5-(4-羧基苯基)-10,15,20-三(4-甲基苯基)-卟啉/MnTaO(h)的MAPLE/PLD激光沉积，获得了最高值(83.7%)，这意味着抑制剂吸附并阻止了酸进入钢电极的活性位点。
