一种新型联吡啶双子季铵盐的合成及缓蚀性能

Synthesis and Corrosion Inhibition Performance of a Novel Bipyridine Gemini Quaternary Ammonium Salt

摘要:

利用失重法、电化学技术、原子力显微镜（AFM）等研究了1, 1'-二苄基-4, 4'-联吡啶季铵盐（PBA）对1 M盐酸溶液中Q235钢的缓蚀作用和其在Q235钢表面的吸附行为。结果表明，PBA是一种同时抑制阴、阳极的混合型缓蚀剂，缓蚀效率随PBA浓度的增加而增加，随温度的升高而略有降低，当PBA浓度为80 mg/L时，缓蚀效果最佳。PBA在Q235钢表面的吸附为放热反应，遵循Langmuir等温式，是以化学吸附为主的混合型吸附。PBA在钢表面形成了一成致密的保护膜，大大阻碍了钢腐蚀。使用量子化学方法研究了PBA的缓蚀机理，结果表明，PBA的活性区域集中于苯环和杂环上，且PBA分子接受电子的能力大于提供电子的能力。

Abstract:

The corrosion inhibition of PBA on the Q235 steel in 1 M hydrochloric acid solution and its adsorption behavior on the Q235 steel surface were studied by means of weight loss method, electrochemical tech-nique and atomic force microscope (AFM) observation. Results show that PBA is a mixed inhibitor that inhibits both cathode and anode. the inhibition efficiency increases with the increase of PBA concentra-tion, and decreases slightly with the increase of temperature, when the mass concentration of PBA is 80 mg/L, the inhibition efficiency is the best. The adsorption of PBA on the carbon steel surface is exothermic, following the Langmuir's adsorption isotherm, which is a mixed adsorption based on chemical adsorption. PBA formed a compact protective film on the steel surface, which greatly hindered the steel corrosion. The inhibition mechanism of PBA was analyzed by quantum chemical method, these results indicate that the active sites of PBA are concentrated on the benzene ring and the heterocyclic ring, and the ability of PBA molecules to accept electrons is greater than the ability to provide electrons.