Electrochemical and Corrosion Properties of Aluminum Brass in Seawater Desalination Environments

Hong JU, Can SUN, Xia LI, Yunfei LIU

Abstract


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.

DOI: http://dx.doi.org/10.5755/j01.ms.23.4.17170


Keywords


desalination; corrosion; electrochemical measurement; SEM; chloride ion

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Print ISSN: 1392–1320
Online ISSN: 2029–7289