聚N-乙烯基咪唑对盐酸介质中Q235钢的缓蚀性能

doi:10.11902/1005.4537.2014.202

中国腐蚀与防护学报

2015, Vol. 35

Issue (1): 55-60 DOI: 10.11902/1005.4537.2014.202

本期目录 | 过刊浏览

聚N-乙烯基咪唑对盐酸介质中Q235钢的缓蚀性能

丁其晨, 陈上(

)

吉首大学化学化工学院吉首 416000

Corrosion Inhibition of Poly N-vinyl Imidazole for Q235 Steel in HCl Solution

DING Qichen, CHEN Shang(

)

College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China

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摘要:

以N-乙烯基咪唑单体为原料,偶氮二异丁腈为引发剂,苯为溶剂,合成聚N-乙烯基咪唑 (PVI)。采用静态失重法、Tafel极化曲线以及电化学阻抗法研究不同温度和含量下PVI在HCl溶液中对Q235钢的缓蚀性能,并研究了其缓蚀机理及缓蚀剂吸附方式。结果表明：在298 K下,1 molL^-¹ HCl溶液中,缓蚀剂浓度为2 mgL^-¹时,缓蚀效率达到90.1%,在高温 (328 K),高酸 (2 molL^-¹) 下的缓蚀率仍可达到84%以上。电化学测试结果表明,PVI属于混合型缓蚀剂,与金属的吸附符合Langmuir吸附等温关系式；吸附自由能结果表明,缓蚀剂具有强烈的在金属上吸附的倾向,主要以化学吸附方式为主。

关键词 ：聚N-乙烯基咪唑, 缓蚀剂, Q235钢

Abstract：

Poly N-vinylimidazole (PVI) was synthesized using N-vinyl imidazole as monomer and azodiisobutyronitrile (AIBN) as initiator in a solvent of benzene. Its corrosion inhibition for Q235 carbon steel in HCl solution were investigated by means of mass loss method, Tafel polarization measurement and electrochemical impedance spectroscopy (EIS). Results indicate that inhibition efficiency of PVI can reach 90.1% in 1 molL^-¹ hydrochloride acidwith 2 mgL^-¹ PVI at 298 K, and it can reach above 84% at high temperature (328 K) in solution of high acidity (2 molL^-¹). The electrochemical measurements suggest that PVI is a kind of mixed type inhibitor, the adsorption of PVI on the surface of metal obeys the Langmuir adsorption isotherm, free energies of adsorption calculated indicate that PVI exhibits strong tendency of adsorption on metal via chemical adsorption.

Key words： poly N-vinyl imidazole corrosive inhibitor Q235 carbon steel

ZTFLH:

O626.1

作者简介: null

丁其晨，男，1988年生，硕士生

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引用本文:

丁其晨, 陈上. 聚N-乙烯基咪唑对盐酸介质中Q235钢的缓蚀性能[J]. 中国腐蚀与防护学报, 2015, 35(1): 55-60.
Qichen DING, Shang CHEN. Corrosion Inhibition of Poly N-vinyl Imidazole for Q235 Steel in HCl Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(1): 55-60.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2014.202 或 https://www.jcscp.org/CN/Y2015/V35/I1/55

图1 PVI的红外谱图

表1 298 K不同 PVI和盐酸溶液浓度条件下Q235碳钢的失重实验结果

图2 Q235钢在298 K含不同浓度PVI的1 molL-1盐酸溶液中的Tafel极化曲线

表2 Q235钢在298 K含不同浓度PVI 的1 molL-1盐酸溶液中极化曲线的拟合参数

图3 Q235钢在298 K含不同浓度PVI的1 molL-1盐酸溶液中的电化学阻抗谱

图4 Q235钢在298 K含不同浓度PVI的1 molL-1盐酸溶液中的等效电路图

表3 Q235钢在298 K不同浓度PVI的1 molL-1盐酸溶液中电化学阻抗谱的拟合参数

图5 298 K含不同浓度PVI的1 molL-1盐酸溶液中Q235碳钢的Langmuir吸附等温线

表4 Q235钢在不同温度含8 mgL-1 PVI 的1 molL-1盐酸溶液中的吸附热力学参数

图6 不同腐蚀条件下Q235钢的表面形貌

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