Zhang H H, Qin C K, Chen Y, Zhang Z
Department of Chemical Engineering and Safety, Binzhou University, Binzhou, Shandong 256600, People's Republic of China.
Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang 310027, People's Republic of China.
R Soc Open Sci. 2019 Aug 21;6(8):190192. doi: 10.1098/rsos.190192. eCollection 2019 Aug.
Three new benzaldehyde thiosemicarbazone derivatives namely benzaldehyde thiosemicarbazone (BST), 4-carboxyl benzaldehyde thiosemicarbazone (PBST) and 2-carboxyl benzaldehyde thiosemicarbazone (OCT) were synthesized and their inhibition effects on mild steel corrosion in 0.5 M HSO solution were studied systematically using gravimetric and electrochemical measurements. Weight loss results revealed that PBST exhibited the highest inhibition efficiency of 96.6% among the investigated compounds when the concentration was 300 µM. The analysis of polarization curves indicated that the three benzaldehyde thiosemicarbazone derivatives acted as mixed type inhibitors and PBST and OCT predominantly anodic. The adsorption process of all these benzaldehyde thiosemicarbazone derivatives on Q235 steel surface in 0.5 M HSO solution conformed to Langmuir adsorption isotherm. Scanning electron microscopy was conducted to show the presence of benzaldehyde thiosemicarbazone derivatives on Q235 mild steel surface. The results of theoretical calculations were in good agreement with that of experimental measurements.
合成了三种新型苯甲醛缩氨基硫脲衍生物，即苯甲醛缩氨基硫脲（BST）、4-羧基苯甲醛缩氨基硫脲（PBST）和2-羧基苯甲醛缩氨基硫脲（OCT），并采用重量法和电化学测量方法系统研究了它们在0.5 M H₂SO₄溶液中对低碳钢腐蚀的抑制作用。失重结果表明，当浓度为300 μM时，PBST在所研究的化合物中表现出最高的抑制效率，为96.6%。极化曲线分析表明，三种苯甲醛缩氨基硫脲衍生物均为混合型缓蚀剂，PBST和OCT主要为阳极型。所有这些苯甲醛缩氨基硫脲衍生物在0.5 M H₂SO₄溶液中Q235钢表面的吸附过程符合Langmuir吸附等温线。进行扫描电子显微镜观察以显示Q235低碳钢表面存在苯甲醛缩氨基硫脲衍生物。理论计算结果与实验测量结果吻合良好。
