Electrochemical and Corrosion Properties of Aluminum Brass in Artificial Seawater

The corrosion behavior and mechanism of aluminum brass (HA177-2) in artificial seawater were investigated using electrochemical measurement, Scanning Electron Microscope (SEM) and Energy Dispersive X-ray spectroscopy (EDX) analysis. The electrochemical results revealed that the corrosion of HA177-2 in the desalination artificial seawater depended on chloride ion concentrations, displaying a maximum with a chloride ion concentration of 2.3 wt.%. Corrosion rate of HA177-2 initial increased and subsequently decreased with the increasing of chloride ion concentration. Moreover, corrosion of HA177-2 becomes more severe when temperature rises. The above results obtained by electrochemical impedance spectroscopy and potentiodynamic polarization tests were in a good agreement. The results of SEM and EDX methods showed selective localized corrosion appeared remarkably on the surface of HA177-2.