Quantitative corrosion analysis and experimental validation of a metal corrosion probe based on phase-field model

Abstract

Electromechanical impedance instrumented metal corrosion probes have received extensive attention in the field of quantitative corrosion monitoring. However, current studies mainly focused on theoretical designs involving artificial quantitative corrosion, and the clear quantitative uniform corrosion phenomena have not been observed yet in real corrosion tests. In this study, a phase-field model is used to simulate the quantitative corrosion of metal corrosion probes and explain the formation mechanisms of various corrosion morphologies. Experimental studies are also carried out to evaluate the corrosion protection capability of three circumferential surface treatments: paint, silicone sealant, and epoxy adhesive. The probe specimen protected with the silicone sealant has better protective performance under the present test conditions. Subsequently, the reliability of the protection scheme and the probe performance are validated through both artificial and accelerated corrosion tests. Finally, a coupled phase-field and piezoelectric simulation framework is established for morphology extraction, impedance prediction, and modal analysis of the probe after accelerated corrosion. The research results show that the phase-field model can effectively reproduce the actual corrosion morphologies of the specimens, while the coupled framework provides a numerical method for the design optimization and performance evaluation of metal corrosion probes.