Tian Huijuan*,Zhao Yue,Guo Qiangqiang,et al.Study on corrosion inhibition of a ternary complex inhibitor composed of o-toluenesulfonamide[J].Plating & Finishing,2024,(2):62-70.[doi:10.3969/j.issn.1001-3849.2024.02.009]
邻甲苯磺酰胺三元复配缓蚀剂的缓蚀性能研究
- Title:
- Study on corrosion inhibition of a ternary complex inhibitor composed of o-toluenesulfonamide
- Keywords:
- corrosion inhibitor ; o-toluenesulfonamide ; synergistic effect ; carbon steel
- 分类号:
- TG174.42
- 文献标志码:
- A
- 摘要:
- 为了研制出用量少、效率高的低毒高效缓蚀剂，采用失重法、电化学和扫描电镜（ SEM ）研究了邻甲苯磺酰胺（ OTS ）、碘化钾（ KI ）和十六烷基三甲基溴化铵（ CTAB ）复配的三元缓蚀剂在 0.5 mol·L -1 硫酸溶液中的缓蚀作用。通过正交试验得到三元缓蚀剂最优浓度比为 OTS ∶ KI ∶ CTAB=15 ∶ 6 ∶ 5 ，总浓度 130 mg·L -1 时，缓蚀率可达 98.18 % 。添加三元缓蚀剂后腐蚀过程的活化能增大，说明腐蚀反应更难发生。三元缓蚀剂符合 Langmuir 吸附等温式，在碳钢表面的吸附为自发的弱化学吸附过程。极化曲线法和电化学阻抗法（ EIS ）计算的缓蚀率均与失重法一致。极化曲线表明三元缓蚀剂是以抑制阳极反应为主的混合型缓蚀剂。 SEM 微观相貌可看出添加三元缓蚀剂后，碳钢表面几乎无腐蚀痕迹，说明三元缓蚀剂分子之间具有缓蚀协同作用，形成了致密牢固的保护膜。
- Abstract:
- ： In order to develop a low toxicity and high efficiency corrosion inhibitor with less dosage and high efficiency ， the corrosion inhibition effect of a ternary corrosion inhibitor composed of o-toluenesulfonamide （ OTS ）， potassium iodide （ KI ） and cetyltrimethyl ammonium bromide （ CTAB ） in 0.5 mol·L -1 sulfuric acid solution was studied by weight loss method ， electrochemistry and scanning electron microscopy （ SEM ） . The optimal concentration ratio of the ternary corrosion inhibitor was OTS ∶ KI ∶ CTAB=15 ∶ 6 ∶ 5 ， and the corrosion inhibition efficiency reached 98.18 % with the total concentration of 130 mg·L -1 . The activation energy of corrosion process increased after the addition of ternary corrosion inhibitor ， indicating that the corrosion reaction was more difficult to occur. The ternary corrosion inhibitor conformed to the Langmuir adsorption isothermal formula ， and the adsorption on the surface of carbon steel was a spontaneous weak chemical adsorption process. The corrosion inhibition efficiencies calculated by polarization curve method and electrochemical impedance method were consistent with that by weight loss method. The polarization curve showed that the ternary corrosion inhibitor was a mixed type corrosion inhibitor which mainly inhibited anode reaction. SEM microscopic appearance showed that there was almost no corrosion trace on the surface of carbon steel after the addition of ternary corrosion inhibitor ， indicating that there was a synergistic effect of corrosion inhibition between ternary corrosion inhibitor molecules ， forming a dense and firm protective film.
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备注/Memo
收稿日期： 2023-07-19 修回日期： 2023-09-01 * 通信作者： 田会娟（ 1982 —），女，博士，副教授， email ： hjtian82@163.com 基金项目： 唐山市科技局项目（ 21130232C ）；河北省高等学校科学技术（青年）项目（ QN202205 ）；唐山师范学院校内项目（ 2222C40 ）