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 ΔGads0 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.
| Original language | English |
|---|---|
| Pages (from-to) | 264-272 |
| Number of pages | 9 |
| Journal | Measurement: Journal of the International Measurement Confederation |
| Volume | 116 |
| DOIs | |
| Publication status | Published - Feb 2018 |
| Externally published | Yes |
Keywords
- AA7075-T6 alloy
- Corrosion
- Corrosion inhibition
- DEIS
- Ethylene glycol
- NaCl solution
ASJC Scopus subject areas
- Instrumentation
- Electrical and Electronic Engineering