An easy-to-assemble probe for in situ corrosion testing of archaeological metal

Abstract

This paper describes the construction and application of an easily assembled electrochemical probe for testing the corrosion of archaeological metals in situ. The probe tip opens a gas-guiding groove to effectively solve the problem of random diffusion of electrolyte solution onto a rusted or patinated surface. After assessing the differences in EIS curves from this probe and a conventional flat cell, a bronze coin of the Northern Song Dynasty with a diameter of 2.5 cm was successfully studied using a 28-point mapping mode. The overall corrosion state of the bronze coin was assessed by fitting the charge transfer resistance (Rct) and rust resistance (Rr) as representative parameters. This is beneficial for providing clear guidance on the protection of targeted micro-areas of metal heritage objects, with broad application prospects in the field of monitoring rusted metal corrosion.