3-丁基5，5-二甲基海因咪唑季铵盐的 合成及缓蚀性能

以5,5-二甲基海因、1,4-二溴丁烷和咪唑为原料,经季铵化反应合成了一种化合物3-丁基-5,5-二甲基海因咪唑季铵盐(BDMHI),产率为62.9%,通过FTIR、~1HNMR、~(13)CNMR对产物结构进行了表征;采用失重法、极化曲线法、交流阻抗法、原子力显微镜研究了BDMHI在质量分数为6%的盐酸腐蚀介质中对Q235钢的缓蚀性能,并探讨了其在Q235碳钢表面的吸附行为。结果显示,在ρ(BDMHI)=1.0 g/L时,缓蚀效率可达91.25%;添加ρ(BDMHI)=0.05~0.8 g/L的缓蚀剂后,阴、阳极反应作用系数fc、fa均小于1且数值相近,表明能同时抑制Q235钢腐蚀的阴、阳极反应过程;缓蚀剂在Q235钢金属表面的吸附符合Langmuir吸附等温式,属于以化学吸附为主的混合吸附。

Synthesis and Corrosion Inhibition of 3-butyl-5,5-dimethyhydantoin Imidazole Ammonium Salt

3- butyl -5,5-dimethylhydantoin Ammonium Salt (BDMH)was Synthesized. The product was separated and purified by column chromatography and thin layer chromatography. The structure of BDMHI were characterized by Fourier transform infrared spectroscopy (FTIR), H- nuclear magnetic resonance spectrum (1HNMR), C- nuclear magnetic resonances spectrum (13CNMR). The corrosion inhibition performance and adsorption behavior of BDMHI for Q235 steel in 6% HCl solution were investigated using weight loss measurements, polarization cure , electrochemical impedance spectroscopy(EIS) methods and AFM. The results showed that BDMHI had excellent corrosion inhibition performance, and both cathodic and anodic processes of Q235 steel corrosion were suppressed. Inhibition efficiency increased with the increase of concentration, and The highest inhibition efficiency was 91.25%. We found that the adsorption of BDMHI on Q235 steel could be fitted to a Langmuir isotherm equation, and it belonged to a mix-type adsorption, which was mainly dominated by chemisorption.