Abstract
Comparison of failure mechanisms of silicone-epoxy hybrid coatings on mild steel and Al-alloy immersed in 5 wt.% NaCl solution was studied by electrochemical impedance spectroscopy, pull-off tests, differential scanning calorimetry and ultra-depth three-dimensional microscope. The results show that there were the effects on diffusion behavior in middle immersion and oxide film formed on metals in final immersion for mild steel and Al-alloy substrates. The effect of coating thickness on the cross-linking density of silicone-epoxy polymer was obvious. The delaminated area and the roughness of coating/metal interfaces were discussed from their respective break-point frequency and fractal dimensions deduced from impedance measurements.
| Original language | English |
|---|---|
| Pages (from-to) | 101-113 |
| Number of pages | 13 |
| Journal | Progress in Organic Coatings |
| Volume | 90 |
| DOIs | |
| State | Published - 1 Jan 2016 |
Keywords
- Break-point frequency
- DSC
- EIS
- Fractal dimensions
- Silicone-epoxy coating