期刊
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
卷 73, 期 1, 页码 45-54出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/maco.202112640
关键词
AC corrosion; cathodic protection; EPMA; Raman spectroscopy; SEM
资金
- Allianz Industrie Forschung [IGF 20273 N]
AC-induced corrosion poses a significant threat to cathodically protected pipelines, but the corrosion mechanisms are still unclear. Research in this study focused on investigating the surface processes of cathodically protected mild steel during AC polarization, demonstrating that the properties of the corrosion product layer are influenced by both AC interference parameters and the cathodic protection potential.
AC-induced corrosion is a big threat even for cathodically protected pipelines nowadays. While this phenomenon was intensively investigated in the last decades, the corrosion mechanisms due to AC interference remain unclear. In the present work, investigations on the surface processes on cathodically protected mild steel during AC polarization have been performed. They utilized high-speed potential measurements that have demonstrated the influence of the polarization parameters on the resulting alternating voltage. The corrosion product layer was characterized with scanning electron microscopy, electron probe microanalysis, and Raman spectroscopy, which clearly show the effect of the parameters of the applied alternating current on the surface under different cathodic protection (CP) conditions. It was demonstrated that the properties of the formed corrosion product layer, meaning the layer thickness, amount of oxygen, and so on, is not only dependent on the AC polarization parameters but also on the CP potential itself.
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