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在不同pH介质中,缓蚀试剂4-甲基-4H-3-巯基-1,2,4-三氮唑(4-MTTL)都能在银基底上形成自组装膜。SERS光谱表明:当pH=3时,4-MTTL分子是以硫醇式,通过两个氮原子为吸附位点,以较平躺方式在银表面构筑自组装膜;当介质为pH=7和pH=11时,4-MTTL以硫醇式,通过氮和硫原子为吸附位点倾斜或垂直方式作用于银表面。由于后者的吸附方式比前者更为垂直于表面,所以形成的膜中分子排列更为致密。电化学极化实验也表明,在pH=3的条件下,形成的4-MTTL单层有更正的腐蚀电位;在pH=11时,构筑的膜缓蚀能力强于pH=7的。并由电化学交流阻抗数据解析了相应的缓蚀机理。
In different pH media, 4-methyl-4H-3-mercapto-1,2,4-triazole (4-MTTL) can form self-assembled membrane on silver substrate. SERS spectra show that when pH = 3, the 4-MTTL molecule is a mercaptan-type, self-assembled film on the silver surface by the two nitrogen atoms as the adsorption sites. When the medium is pH = 7 and At pH = 11, the 4-MTTL acts on the silver surface in a thiol-like manner with the nitrogen and sulfur atoms as adsorption sites tilted or vertically. Due to the latter adsorption method is more perpendicular to the surface than the former, so the formation of the membrane molecular arrangement is more dense. Electrochemical polarization experiments also showed that the formed 4-MTTL monolayer had a corrected corrosion potential at pH = 3; the corrosion inhibition ability of the constructed membrane was stronger at pH = 11 than that of pH = 7. The corresponding corrosion inhibition mechanism was analyzed by electrochemical AC impedance data.