Department of Chemistry, University of North Texas, 1155 Union Circle #305070, Denton, TX 76203, USA.
Molecules. 2022 Oct 3;27(19):6550. doi: 10.3390/molecules27196550.
In this study, the inhibitive performance of pyridine-2-thiol added to a corrosive solution was investigated for brass using potentiodynamic polarization, electrochemical impedance spectroscopy, and X-ray photoelectron spectroscopy. Electrochemical experiments were performed with different inhibitor concentrations in 0.5 M HSO as the corrosive medium. For potentiodynamic polarization, i values decreased significantly for the inhibited solutions in contrast with the uninhibited solution. Pyridine-2-thiol had an optimum inhibition concentration of 0.25 mM, giving an i value of 1.8 µA/cm compared to 26 µA/cm for the blank solution. EIS data indicated that R and R values increased substantially after the addition of the corrosion inhibitor and corrosion inhibition efficiencies of more than 85% was achieved for the majority of the inhibited solutions. Scanning electron microscopy showed defect free and less scale formation for the inhibited surface but the bare brass surface had larger amounts of scale formation. X-ray photoelectron spectroscopy and UV-vis spectroscopy was used to investigate surface chemical composition and inhibitor structural changes over time.
在这项研究中，使用动电位极化、电化学阻抗谱和 X 射线光电子能谱研究了吡啶-2-硫醇在腐蚀性溶液中对黄铜的抑制性能。电化学实验在 0.5 M HSO 作为腐蚀性介质的不同抑制剂浓度下进行。对于动电位极化，与未抑制溶液相比，抑制溶液的 i 值显著降低。吡啶-2-硫醇的最佳抑制浓度为 0.25 mM，i 值为 1.8 µA/cm，而空白溶液的 i 值为 26 µA/cm。EIS 数据表明，添加腐蚀抑制剂后 R 和 R 值显著增加，大多数抑制溶液的腐蚀抑制效率超过 85%。扫描电子显微镜显示，抑制表面无缺陷且结垢较少，而裸露的黄铜表面结垢较多。X 射线光电子能谱和紫外可见光谱用于研究表面化学成分和抑制剂结构随时间的变化。
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