Journal
PROGRESS IN ORGANIC COATINGS
Volume 90, Issue -, Pages 101-113Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.porgcoat.2015.10.004
Keywords
Silicone-epoxy coating; EIS; DSC; Break-point frequency; Fractal dimensions
Funding
- National Nature Science Fund of China [51405391, 51402238]
- Fundamental Research Foundation at Northwestern Polytechnical University [JC201138]
- Aeronautical Science Foundation of China [2012ZD53053]
- Aerospace Technology Support Fund of China [2013-HT-XGD]
- Specialized Research Fund for the Doctoral Program of Higher Education of China [20126102120034]
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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. (C) 2015 Elsevier B.V. All rights reserved.
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