Galvanic corrosion between zinc and carbon steel investigated by local electrochemical impedance spectroscopy
Abstract
The study of galvanic coupling between two metals is still a relevant topic, particularly in aerospace and
automotive industries. The development of local electrochemical techniques leads to a better understanding
of the phenomena occurring at the interfacial zone. Galvanic coupling between carbon steel and zinc
was investigated by local electrochemical impedance spectroscopy (LEIS) in a 0.06 g L−1 NaCl solution.
Voltammetry and conventional electrochemical impedance experiments were also performed to better
analyze the local impedance data. Local measurements carried out at a fixed frequency showed that zinc
dissolution was more significant at the steel/zinc interface. A particular shape of the local impedance diagram
was observed above the zinc surface with the presence of a large inductive loop in the low-frequency
range. Numerical simulations, performed by using finite element method, allowed the local experimental
diagrams obtained over the zinc sample to be validated taking into account the radial contribution of the
current between both materials in galvanic coupling.
Origin : Files produced by the author(s)
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