N,N '-二(4,6-二氨基酸基-1,3,5-三嗪基)-己二胺的合成及缓蚀性能
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南京理工大学 化学与化工学院

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TQ630

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Synthesis and corrosion inhibitory of N,N '-bis(4,6-diamino acid-1,3,5-triazinyl)-hexanediamine
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Chemistry and Chemical Engineering,Nanjing University of Science & Technology

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    摘要:

    以三聚氯氰为母体,接入氨基酸(2-氨基乙酸、3氨基丙酸、4-氨基丁酸、6-氨基己酸)和1,6-己二胺,设计合成4种缓蚀剂:N,N'-二[4,6-二(2-氨基乙酸基)-1,3,5-三嗪基]-己二胺(TFYJ)、N,N ' -二[4,6-二(3-氨基丙酸基)-1,3,5-三嗪基)]-己二胺(TFBJ)、N,N ' -二[4,6-二(4-氨基丁酸基)-1,3,5-三嗪基]-己二胺(TFDJ)、N,N ' -二[4,6-二(6-氨基己酸基)-1,3,5-三嗪基)]-己二胺(TFJJ)。利用FT-IR、1H NMR、MS对其结构进行了表征。通过静态失重法、电化学法测试了45#碳钢在1 mol/L HCl中的缓蚀性能,分析了缓蚀机理。结果表明,4种目标缓蚀剂在1 mol/L HCl中对45#碳钢表现出优异的缓蚀效果。20 ℃下,质量浓度为100 mg/L的TFJJ缓蚀效率达到了98.37%(失重法)。Tafel曲线显示是以阴极为主的混合型缓蚀剂。吸附热力学显示TFJJ符合Langmuir等温吸附方程,是以化学吸附为主、自发的吸附过程。量化计算得到了TFJJ分子的最高被占据轨道能量(EHOMO)、最低空轨道能量(ELUMO)、Fukui指数等,证明TFJJ的缓蚀作用发生在三嗪环和氨基上的N原子,羧酸基团上的C、O原子上。与市售NUEF485相比,合成的产品缓蚀率提高了5.25 %~9.44 %,在600 mg/L的硬水下,依然具有良好的耐硬水性。

    Abstract:

    Four kinds of corrosion inhibitors, N,N'-bis[4,6-bis(2-aminoacetoxy)-1,3,5-triazinyl]-hexanediamine (TFYJ), N,N'-bis[4,6-bis (3-aminopropionyl)-1,3,5-triazinyl)]-hexanediamine (TFBJ), N,N'-bis[4,6-bis(4-aminobutyryl)-1 ,3,5-triazinyl)]-hexanediamine (TFDJ), N,N'-bis[4,6-bis(6-aminocaproic acid)-1,3,5-triazinyl)] -Hexylenediamine (TFJJ),was designed and synthesized by cyanuric chloride、amino acid(2-aminoacetic acid、3-aminopropionic acid、4-aminobutyric acid、6-aminocaproic acid)、1,6-hexanediamine. Its structure was characterized by FT-IR、1H NMR and MS. The corrosion inhibition of 45# carbon steel in 1 mol/L HCl was tested by weight loss method,electrochemical method and the corrosion inhibition mechanism was ananlyzed. The results showed that four types of target corrosion inhibitor had excellent corrsion inhibition effect on 45# carbon steel in 1 mol/L HCl. Preferably,the corrosion inhibition rate of TFJJ(100 mg/L)at 20 ℃ could reach 98.37 %(weight loss method). The Tafel curve showed that it was a mixed corrosion inhibitor,dominated by cathodes. The adsorption thermodynamics showed that TFJJ conformed to the Langmuir isotherm adsorption equation, and the adsorption process was mainly chemical adsorption. EHOMO, ELUMO, Fukui index, etc. of TFJJ were obtained by quantitative calculation, which proved that the corrosion inhibition of TFJJ occured on the N atom of the triazine ring and amino group, and the C and O atoms of the carboxylic acid group. Compared with the commercially available NUEF485, the corrosion inhibition rate of the product synthesized in this paper is increased by 5.25 %~9.44 %, and it still had good hard water resistance under 600 mg/L hard water.

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李国宇,朱广军. N, N '-二(4,6-二氨基酸基-1,3,5-三嗪基)-己二胺的合成及缓蚀性能[J].精细化工,2023,40(2):

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  • 收稿日期:2022-06-06
  • 最后修改日期:2022-08-15
  • 录用日期:2022-08-16
  • 在线发布日期: 2023-01-17
  • 出版日期: 2022-09-30