CO2体系中咪唑啉季铵盐与十二烷基磺酸钠之间的缓蚀协同效应.pdf

物理化学学报( Wuli Huaxue Xuebao)
p
Acta Phys. -Chim. Sin. 2014, 30(4), 677-685
677
Article
doi:10.3866/PKU.WHXB201402111
www.whxb.pku.eau.cn
CO2体系中咪唑啉季铵盐与十二烷基磺酸钠之间的缓蚀协同效应
张晨1赵景茂2
北京化工大学材料科学与工程学院,北京10009;2材料电化学过程与技术北京市重点实验室,北京10009)
摘要:釆用失重法、电化学阻抗谱(EIS)、极化曲线、X射线光电子能谱仪(XPS)及扫描电子显微镜(SEM)研究
了cO2饱和的3.5%Na?腐蚀介质中,咪唑啉季铵盐(IAS)与十二烷基磺酸钠(SDSH对Q235钢的缓蚀协同效
应结果表明,AS与低浓度SDSH在腐蚀介质中具有较好的缓蚀协同效应,且当二者以1:1(50mg·L-:50mg
L-)的浓度比例复配时,协同效应最明显,缓蚀率为88.5%;而IAS与高浓度SDSH间会产生拮抗效应.本文通
过建立合理的吸附模型,阐述了协同效应及拮抗效应的机理.SDSH与IAS在Q235钢表面的吸附过程均为放
热的自发过程,前者符合 Frumkin吸附模型,后者符合 Temkin吸附模型.单独使用较高浓度的SDSH对Q235
钢也有较好的缓蚀作用,缓蚀率接近90%.
关键词:CO2腐蚀;阴离子表面活性剂;吸附;协同效应;拮抗效应
中图分类号:O646
Synergistic Inhibition Effect of Imidazoline Ammonium Salt and
Sodium Dodecyl Sulfate in CO2 System
ZHANG Chen' ZHAO Jing-mao'2
(College of Material Science and Engineering, Beiiing University of Chemical Technology, Beijing 100029, P R. China
Beijing Key Laboratory of Electrochemical Process and Technology for Materials, Beijing 100029,P R China
Abstract: The synergistic nhibition effect of the imidazoline ammonium salt(IAS)and sodium dodecyl
sulfate(DSH )on the corrosion of Q235 carbon steel in a CO saturated brine solution was studied b
weight loss, electrochemical impedance spectroscopy(ES), Tafel polarization measurements, X-ray
photoelectron spectrometry (XPS), and scanning electron microscopy(SEM). We found that in the CO
saturated brine solution, a good synergistic inhibition effect exists between 1AS and low concentrations of
SDSH, and the most significant synergistic inhibition occurred at a concentration ratio of 1: 1(50 mgL 50
mg L with an inhibition efficiency of.5%. However, antagonism curs upon ming AS with a hi
concentration of SDSH. In this paper, the mechanisms of the synergistic and antagonistic effects are
analyzed using a reasonable adsorption model. Good corrosion inhibition on Q235 carbon steel was also
found when only using a high concentration of SDSH with an inhibition efficiency of about 90%. Both the
adsorption processes of SDSH and IAS on the surface of Q235 carbon steel are spontaneous processes
and the former process complies with the Frumkin adsorption model while the later complies with the
elkin adsorption model
Key Words: CO corrosion; Anionic surfactant; Adsorption; Synergistic effect; Antagonistic effect
Received: September Il, 2013; Revised: January 26, 2014; Published on Web: February 11, 2014
CorrespondingauthorEmail:Jingmaozhao(@126.com;Tel:+86-10-64442286
The project was supported by the National Natural Science Foundation of China (51171013)
国家自然科学基金(51171013)资助项目
O Editorial office of Acta Physico-chimica Sinica