苯胺四聚体聚乙二醇嵌段共聚物在盐酸介质中对Q235钢的缓蚀性能

目的研究苯胺四聚体PEG两亲性嵌段共聚物(PEG-TA)对Q235钢在1 mol/L HCl介质中的缓蚀性能。方法采用静态失重测试、电化学测试、腐蚀表面形貌分析研究了自制的PEG-TA在1 mol/L HCl介质中对Q235钢的缓蚀性能,并探讨了其在Q235钢表面的吸附行为。结果红外和紫外表征表明,氨基封端苯胺四聚体和聚乙二醇为原料成功合成了两亲性嵌段共聚物PEG-TA。极化曲线研究表明,PEG-TA的加入明显可以抑制Q235钢在1 mol/L HCl介质中的腐蚀,且随着PEG-TA浓度的增加,缓蚀效果越好,在25℃的实验温度范围内,质量浓度为30 mg/L时,PEG-TA的缓蚀效率可以达到93.97%,属于阴极抑制为主的混合型缓蚀剂。电化学阻抗图谱研究表明,随着PEG-TA浓度的增加,Q235钢表面腐蚀反应的电荷转移电阻和膜电阻逐渐增大,钢表面缓蚀剂的含量和覆盖率增加,腐蚀抑制性增强。PEG-TA缓蚀剂分子在Q235钢表面的吸附遵循Langmuir等温模型,并且属于物理和化学混合吸附。SEM研究证明,在1 mol/L HCl中,PEG-TA可有效地抑制碳钢的腐蚀。结论 PEG-TA在1 mol/L HCl中有效提高了Q235钢的耐蚀性,是一种高效环保的缓蚀剂。

Corrosion Inhibition of PEG-TA Amphiphilic Block Copolymer on Q235 Steel in 1 mol/L HCl Medium

The work aims to study corrosion behavior of anilinete tramer-PEG amphiphilic block copolymer (PEG-TA) on Q235 steel in 1 mol/L HCl medium. Corrosion inhibition of self-made PEG-TA on Q235 steel in 1 mol/L HCl medium was stu-died by performing static weightlessness test, electrochemical test and corrosion surface observation, and its adsorption behavior on Q235 steel was discussed. FTIR and UV spectra showed that the amphiphilic block copolymer PEG-TA was successfully made from amine-capped aniline tetramer and polyethylene glycol. Polarization curve study showed that the addition of PEG-TA could obviously inhibit the corrosion of Q235 steel in 1 mol/L HCl medium, the inhibition efficiency increased as the PEG-TA concentration increased. Provided with experimental temperature of 25℃ and mass concentration of 30 mg/L, inhibi-tion efficiency of the PEG-TA was up to 93.97%, hence PEG-TA was a cathodic inhibition-oriented mixed type inhibitor. The electrochemical impedance spectroscopy study showed that with the increase of PEG-TA concentration, charge transfer resis-tance and film resistance of surface corrosion reaction gradually increased, content and coverage of corrosion inhibitors on steel increased, corrosion inhibition improved. Adsorption of PEG-TA inhibitor molecules on Q235 steel surface adsorption coincided with Langmuir isothermal model, and was classified as physical and chemical mixed adsorption. SEM study further proved that PEG-TA could effectively inhibit the corrosion of Q235 steel in 1 mol/L HCl. PEG-TA is an effective corrosion inhibitor which can effectively improve the corrosion resistance of Q235 steel in 1 mol/L HCl.