油溶性曼尼希碱缓蚀剂对紫铜在变压器油中的缓蚀行为研究

Oil Soluble Mannich Base Corrosion Inhibitor for Corrosion Inhibition of Copper in Transformer Oil

通过甲醛,十二胺和乙酰丙酮合成一种油溶性曼尼希碱类缓蚀剂(OMB),采用Fourier变换红外光谱(FT-IR)表征其结构。用盐雾实验分析OMB和石油磺酸钡(T701)以25#变压器油作为基础油配置防锈油后对紫铜的缓蚀性能,使用扫描电子显微镜(SEM)和原子力显微镜(AFM)进行腐蚀形貌观察,使用X射线光电子能谱(XPS)对表面进行成分分析,并结合量子化学计算和分子动力学模拟,以及Langmuir等温吸附方程式,进一步探讨了OMB对紫铜的缓蚀机理。结果表明:OMB是一种在盐雾环境下对紫铜具有优良缓蚀效果的缓蚀剂,其在紫铜表面的吸附行为为自发性吸附,符合混合吸附规律且以化学吸附为主,且平行吸附于Cu的表面。

An oil-soluble Mannich base corrosion inhibitor(OMB)was synthesized from formaldehyde,dodecylamine and acetone,and which then was characterized by Fourier transform infrared spectroscopy(FT-IR).The corrosion inhibition effect of OMB and barium petroleum sulfonate(T701)on copper in 25#transformer oil was comparatively assessed by means of salt spray test,scanning electron microscopy(SEM)and atomic force microscopy(AFM)and X-ray photoelectron spectroscopy(XPS).According to the quantum chemical calculation(Gaussian 09),molecular dynamics simulation(M-S)and Langmuir isothermal adsorption equation,the corrosion inhibition mechanism of OMB on copper was further discussed.The results show that OMB is a corrosion inhibitor with excellent corrosion inhibition effect on copper in salt spray test.The adsorption behavior of OMB on copper surface is spontaneous adsorption,which accords with mixed adsorption law and is mainly chemical adsorption,and the OMB moleculars are adsorbed parallel to the surface of copper.