温度影响席夫碱缓蚀剂吸附的机理研究

doi:10.11902/1005.4537.2020.156

中国腐蚀与防护学报

2021, Vol. 41

Issue (6): 786-794 DOI: 10.11902/1005.4537.2020.156

研究报告

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温度影响席夫碱缓蚀剂吸附的机理研究

胡慧慧, 陈长风(

)

中国石油大学 (北京) 新能源与材料学院北京 102249

Mechanism of Temperature Influence on Adsorption of Schiff Base

HU Huihui, CHEN Changfeng(

)

School of New Energy and Materials, China University of Petroleum (Beijing), Beijing 102249, China

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摘要:

研究了所合成的两种含有苯基基团的席夫碱缓蚀剂 (BB-S缓蚀剂和B-S缓蚀剂) 在不同温度下对N80钢在0.5%盐酸溶液中的缓蚀作用，探讨了温度影响席夫碱缓蚀剂的吸附机理。结果表明，BB-S缓蚀剂和B-S缓蚀剂的缓蚀效率随着温度的升高而降低，且B-S缓蚀剂的缓蚀效率在不同温度下始终大于BB-S缓蚀剂的缓蚀效率。分子动力学和量子化学计算方法表明，两种席夫碱缓蚀剂的缓蚀效率随温度的升高而降低，该现象与席夫碱缓蚀剂中苯环较大的空间位阻、分子热运动、分子吸附构型以及前线轨道能级密切相关。

关键词 ：席夫碱缓蚀剂, 温度, 吸附, 苯环, 脱附

Abstract：

Two Schiff base corrosion inhibitors containing phenyl groups, namely BB-S corrosion inhibitor and B-S corrosion inhibitor are synthesized, and then their corrosion inhibition behavior for the corrosion of N80 steel in 0.5% (mass fraction) HCl solution at temperatures within the range of 30~90 ℃ was assessed. The effect of temperature on the adsorption mechanism of Schiff base corrosion inhibitor was also discussed. The results show that the corrosion inhibition efficiency of corrosion inhibitors BB-S and B-S all decreases with the increasing temperature, while the corrosion inhibition efficiency of B-S is always greater than that of BB-S at different temperatures. Results of molecular dynamics and quantum chemistry calculation indicate that the decrease in corrosion inhibition efficiency of the two Schiff base corrosion inhibitors with the increasing temperature may be closely related to the larger steric hindrance of the benzene ring in the Schiff base corrosion inhibitor, molecular thermal movement, molecular adsorption configuration and frontline orbital energy. This study is of great significance for understanding the effect of temperature on the corrosion inhibition mechanism of corrosion inhibitors.

Key words： Schiff base corrosion temperature adsorption benzene ring desorption

收稿日期: 2020-08-31

ZTFLH:

TB37

通讯作者: 陈长风 E-mail: chen_c_f@163.com

Corresponding author: CHEN Changfeng E-mail: chen_c_f@163.com

作者简介: 胡慧慧，女，1995年生，硕士生

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引用本文:

胡慧慧, 陈长风. 温度影响席夫碱缓蚀剂吸附的机理研究[J]. 中国腐蚀与防护学报, 2021, 41(6): 786-794.
Huihui HU, Changfeng CHEN. Mechanism of Temperature Influence on Adsorption of Schiff Base. Journal of Chinese Society for Corrosion and protection, 2021, 41(6): 786-794.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2020.156 或 https://www.jcscp.org/CN/Y2021/V41/I6/786

图1 两种缓蚀剂的合成反应

图2 两种席夫碱缓蚀剂的红外光谱图

图3 N80钢在不同温度下添加BB-S和B-S缓蚀剂的缓蚀效率

图4 N80钢在不同温度下添加BB-S和B-S缓蚀剂的腐蚀形貌

图5 N80钢在不同温度下添加BB-S和B-S缓蚀剂的极化曲线

表1 在0.5 mol·L-1 HCl溶液中含B-S和BB-S缓蚀剂的N80碳钢不同温度下的电化学极化参数

图6 N80钢在不同温度下添加BB-S和B-S缓蚀剂的电化学阻抗谱

图7 N80钢在添加B-S和BB-S缓蚀剂的溶液中阻抗谱的等效电路图

表2 在0.5 mol·L-1 HCl溶液中不同温度下的N80钢添加缓蚀剂的阻抗谱参数

图8 前沿轨道能级图

表3 B-S和BB-S缓蚀剂的量子化学参数

图9 B-S和BB-S缓蚀剂在Fe(110) 表面吸附的最稳定构型

表4 B-S和BB-S缓蚀剂在不同温度下的吸附能

图10 B-S和BB-S缓蚀剂的缓蚀机理图

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