Investigation of the Corrosion Inhibition Performance of Metal Cations for Mild Steel in Simulated Fresh Water at High Temperature

Abstract

The influence of metal cations on corrosion of mild steel sheet was investigated by immersion tests and electrochemical impedance spectroscopy（ EIS） at high temperature using solutions of simulated fresh water. Immersion tests showed the different corrosion rates in different solutions, and the steel showed the minimum corrosion in the solution containing Zn^2＋. Surface morphology changes of steel due to corrosion by the metal cations were carried out by scanning electron microscopy （SEM）. Measurement of the charge transfer resistance （R_ct） and XPS results suggested that Zn^2＋ exists on the steel surface by forming a layer, thereby improving the protective property of the passive films of mild steel.