Influence of novel ammonium-modified zinc-free phosphate nanofillers on anticorrosive features of primer-less polyurethane top-coating compositions
| Autor: | Krzysztof Kowalczyk, Katarzyna Przywecka, Barbara Grzmil |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Materials science
chemistry.chemical_element Zinc phosphate 02 engineering and technology Surfaces and Interfaces General Chemistry Zinc engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology Phosphate 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Dielectric spectroscopy chemistry.chemical_compound Colloid and Surface Chemistry chemistry Coating engineering Salt spray test Ammonium 0210 nano-technology Polyurethane Nuclear chemistry |
| Zdroj: | Journal of Coatings Technology and Research. 16:401-414 |
| ISSN: | 1935-3804 1547-0091 |
| DOI: | 10.1007/s11998-018-0119-7 |
| Popis: | Anticorrosive polyurethane coating compositions were compounded using novel zinc-free nanosized phosphates: aluminum ammonium phosphates (AAP) or calcium aluminum ammonium phosphates (CAAP). For comparison, a nanosized strontium phosphate (SP), AAP/SP mixtures, and a microsized zinc phosphate (ZP) were tested. Paints containing ammonium-modified phosphates exhibited similar or a slightly higher viscosity than systems with SP or ZP. Nevertheless, coatings with the AAP or CAAP reached significantly better gloss and adhesion to a steel substrate as well as a slightly higher hardness. Results of a salt spray test showed that anticorrosive properties of the coatings containing AAP/SP mixtures were markedly better in relation to the systems containing solely AAP, CAAP, SP, or ZP. Electrochemical tests revealed the best barrier/anticorrosive features for AAP (electrochemical impedance spectroscopy and potentiodynamic polarization) or SP and CAAP (a novel electrochemical noise technique). |
| Databáze: | OpenAIRE |
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