【摘要】 以乙二胺和芳香醛为原料合成了乙二胺双缩肉桂醛(NDCE)、乙二胺双缩苯甲醛(NDBE)、乙二胺双缩水杨醛(NDSE)和乙二胺双缩对二甲胺基苯甲醛(NDDE)四种双缩Schiff碱缓蚀剂,用元素分析和红外分析对其结构进行了表征,并采用静态失重法和电化学法研究了90℃时它们在15%(质量分数,下同)HCl中对N80钢的缓蚀性能。结果表明:NDCE的缓蚀效果最好,当NDCE的加量为0.75%时,缓蚀率达到99.17%,且NDCE在N80钢片表面的吸附行为符合Langmuir吸附等温模型;NDCE是一种混合型酸化缓蚀剂,在N80钢表面形成了一层保护膜,有效抑制了酸液对N80钢的腐蚀。更多还原

【Abstract】 Four bis-Schiff bases N,N′-dicinnamylidene-1,2-diaminoethane(NDCE),N,N′-dibenzylidene-1,2-diaminoethane(NDBE),N,N′-disalicylidene-1,2-diaminoethane(NDSE) and N,N′-bis(4-dimethylaminobenzylidene)-1,2-diaminoethane(NDDE)were prepared as acidizing corrosion inhibitors through condensation reaction using ethylenediamine and aromatic aldehydes as raw materials.The chemical structures of Schiff bases were confirmed by Fourier transform infrared spectroscopy(FT-IR)and elemental analysis.The corrosion inhibition of the inhibitors to N80 steel in 15% HCl solution at 90 ℃ was investigated by static weight loss measurement and electrochemical testing.The results show that NDCE had the best corrosion inhibition than others,and the inhibition efficiency of NDCE reached 99.17%at a concentration of 0.75%.The adsorption process of NDCE onto the steel surface obeys Langmuir adsorption isotherm.NDCE is a mixed type inhibitor,which could effectively inhibit the corrosion in acid solution by forming protective layer on the surface of N80 steel.更多还原