APPLICATION OF DYNAMIC ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY TO THE EVALUATION OF THE CORROSION RESISTANCE OF A HISTORIC BRONZE OBJECT IN ARTIFICIAL ACID RAINWATER

作者：Mareci Daniel; Rusu Iulian; Chelariu Romeu; Bolat Georgiana^*; Munteanu Corneliu; Sutiman D; Souto R M

来源：European Journal of Science and Theology, 2013, 9(6): 189-199.

• bronze
• acid rain
• linear anodic potentiodynamic polarization
• DEIS
• SEM

Anodic potentiodynamic polarization curves (PPC) and dynamic electrochemical impedance spectroscopy (DEIS) measurements were carried out on a historic bronze object exposed to an artificial acid rain in order to assess its corrosion resistance. DEIS measurements were performed over a wide range of potentials covering the open circuit potential, passive, breakdown and dissolution ranges revealed in the potentiodynamic polarization curve. DEIS reveals the changes that occur in the structure of the passive layer due to increased anodic polarization. Impedance spectra determined in various potential regions were satisfactorily fitted to model electrical equivalent circuits, and conclusions regarding the layers formed on the surface of the materials at those polarizations were extracted. The surface morphology and composition of the bronze surface after different polarizations were characterized using scanning electron microscopy (SEM) combined with energy dispersive spectrometry (EDX) techniques.

• 出版日期2013-12