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以4-三氟甲基苯甲醛与乙二胺为原料,经Schiff反应合成了席夫碱化合物(BEA),反应条件:反应温度为65℃,n(乙二胺)∶n(4-三氟甲基苯甲醛)=5∶1,反应时间为6 h;BEA与均苯三甲酰氯经酰胺化反应合成了多吸附位点席夫碱缓蚀剂(BTA),反应条件:反应温度为50℃,n(BEA)∶n(均苯三甲酰氯)=3.3∶1,反应时间为8 h。采用静态挂片失重法、电化学法和扫描电子显微镜(SEM)研究BEA和BTA对P110钢在1 mol/L盐酸中的缓蚀性能。失重法研究表明,当缓蚀剂质量浓度为200 mg/L时,BTA缓蚀率达99.39%,BEA的缓蚀率仅94.29%;等温吸附行为研究结果表明,缓蚀剂分子能自发地吸附于P110钢表面,满足Langmuir吸附模型;电化学法研究结果表明,BTA属于阳极控制型,在金属表面形成保护性膜,能有效抑制金属腐蚀。因此,多吸附位点缓蚀剂BTA缓蚀性能优于BEA。
Schiff base compound (BEA) was synthesized by Schiff reaction from 4-trifluoromethylbenzaldehyde and ethylenediamine. The reaction conditions were as follows: the reaction temperature was 65 ℃, n (ethylenediamine): n Fluoromethylbenzaldehyde) = 5: 1, the reaction time was 6 h; BEA and trimesoyl chloride were amidated to synthesize multiple adsorption sites Schiff base inhibitor (BTA), the reaction conditions: the reaction temperature was 50 ℃, n (BEA): n (trimesoyl chloride) = 3.3:1, the reaction time is 8 h. The corrosion resistance of P110 steel in 1 mol / L hydrochloric acid was investigated by static coupon weight loss method, electrochemical method and scanning electron microscope (SEM). The results of weight loss method showed that the corrosion inhibition rate of BTA was 99.39% and the corrosion inhibition rate of BEA was only 94.29% when the concentration of corrosion inhibitor was 200 mg / L. The results of isothermal adsorption showed that the corrosion inhibitor could spontaneously adsorb On the surface of P110 steel, the Langmuir adsorption model was satisfied. The results of electrochemical method showed that BTA belongs to the anode control type and forms a protective film on the metal surface, which can effectively inhibit metal corrosion. Therefore, multi-adsorption site corrosion inhibitor BTA corrosion performance is better than BEA.