Effects of Additives on the Corrosion Behavior of Magnesium Alloy Electrode in Magnesium Perchlorate Electrolyte

Abstract

Aiming at studying the corrosion inhibition effect of different additives on magnesium alloy electrode in magnesium perchlorate electrolyte, the Tafel polarization curve, electrochemical impedance spectroscopy (EIS), surface microscopic morphology and elemental chemical composition of magnesium alloy in magnesium perchlorate electrolyte with different additives were tested and analyzed by electrochemical workstation and scanning electron microscope (SEM). Results showed that when the magnesium perchlorate electrolyte was added with 0.5 mol/L triethanolamine (TEA), the corrosion current density of magnesium alloy electrode was the smallest, the EIS capacitive arc diameter was the largest, and the corrosion inhibition effect was the best. Meantime, by analyzing the microscopic morphology and chemical composition of the magnesium alloy electrode after immersion treatment, it was found that the triethanolamine could be adsorbed on the surface of magnesium alloy to form a protective film with a certain thickness, which slowed down the corrosion of magnesium alloy surface.

Keywords

• magnesium alloy|additive|magnesium perchlorate electrolyte|triethanolamine|corrosion inhibition effect