Electrochemical properties of coatings from renewable natural products
- North Dakota State Univ., Fargo, ND (United States)
Organic coatings based on renewable natural products were investigated by DC Resistance Measurements, Electrochemical Impedance Spectroscopy and Electrochemical Noise Measurements. The binder component was an alkyd diluted by variable amount of modified linseed oil (Dilulin{reg_sign}, Cargill). Unpigmented films on steel initially showed a medium resistance (consistently for Resistance Noise, Impedance and DC Resistance around 10{sup 8} {Omega}) decreasing after 8 weeks of immersion in 3% NaCl solution to roughly 10{sup 6} {Omega}. Furthermore, corrosion inhibitive pigments (chromate replacements) were added to the binder to improve the protective properties and investigated by the afore mentioned methods. Zinc molybdates and zinc phosphates increased the resistance only slightly and for a longer immersion time, while borosilicates deteriorated the protective properties dramatically.
- OSTI ID:
- 370927
- Report Number(s):
- CONF-960376--
- Country of Publication:
- United States
- Language:
- English
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