Study the adsorption mechanism of corrosion inhibitor on carbon steel surface
作者
单位
1. Institute for Advanced Materials and Technology、University of Science and Technology Beijing、Beijing、China 2. Université PSL、CNRS – Chimie ParisTech、Institut de Recherche de ChimieParis、Groupe Physico-Chimie des Surfaces、75005 Paris、France 3. Institute for Corrosion Multiphase Technology、Ohio University、Athens OH 45701、USA 4. Sorbonne Université、CNRS、Laboratoire Interfaces et Systè mes Electrochimiques (LISE、UMR 8235)、4 place Jussieu、(case courrier 133)、75005、Paris、France
关键词
收录来源
International Corrosion Congress · 第22届国际腐蚀大会
摘要
ToF-SIMS was used to study the adsorption of tetradecyl-benzyl-dimethyl-ammonium (BDA-C14) corrosion inhibitor on carbon steel surface. BDA -C14 forms a protective layer with N -containing polar head group interacting with carbon steel surface. The adsorbed inhibitor surface coverage strongly depends on immersion time and inhibitor concentration. A full and uniform coverage is found for sufficiently long exposure times at a critical inhibitor concentration of about 25 ppmw. For immersion times below 20 min, defective areas remain in the inhibitor layer where iron dissolution with the formation of chloride/hydroxide intermediates occurs. These defective a reas are progressively sealed and a uniform and compact inhibitor layer covers the surface after 1 h of immersion time, mitigates the chloride diffusion through oxide layer and the formation of chloride/hydroxide intermediates.