Electrochemical and Corrosion Properties of Aluminum Brass in Seawater Desalination Environments
Keywords:desalination, corrosion, electrochemical measurement, SEM, chloride ion
The corrosion behavior and mechanism of aluminum brass (HAl77-2) in seawater desalination plant were investigated using electrochemical measurement, Scanning Electronic Microscope (SEM) and Energy Dispersive X-ray spectroscopy (EDX) analysis. The electrochemical results revealed that the corrosion of HAl77-2 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 HAl77-2 initial increased and subsequently decreased with the increasing of chloride ion concentration. Moreover, corrosion of HAl77-2 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 HAl77-2.
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