An evaluation of the anticorrosion effect of ethylene glycol for AA7075-T6 alloy in 3.5% NaCl solution
By Gerengi, H
Published in Measurement
2018
Abstract
The corrosion behaviour of AA7075-T6 aluminum alloy in 3.5% NaCl devoid of and containing various amounts of ethylene glycol (EG) has been examined by {DEIS} (dynamic electrochemical spectroscopy), {PDP} (Potentiodynamic polarization), {SEM} (scanning electron microscope), {EDAX} (energy dispersive X-ray spectroscopy), and {AFM} (atomic force microscope). AA7075-T6 alloy specimen corroded significantly in 3.5% NaCl solution. In 3.5% NaCl containing EG, the alloy is protected but the extent of protection is a function of immersion duration and concentration of EG. {EG} affects both the anodic and cathodic corrosion reactions according to {PDP} results. The adsorption of {EG} molecules onto AA7075-T6 surface follow Langmuir adsorption isotherm model. The ? G ads 0 value calculated for the adsorption process reveals that physisorption is the prevailing mechanism. {SEM} and {AFM} pictures support the experimental results and {EDAX} results confirm the presence of {EG} molecules on AA7075-T6 surface.
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