Corrosion protection of cold-rolled steel by zinc-rich epoxy paint coatings loaded with nano-size alumina supported polypyrrole |
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| Authors: | András Gergely Éva Pfeifer Imre Bertóti Tamás Török Erika Kálmán |
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| Affiliation: | aDepartment of Surface Modification and Nanostructures, Institute of Nanochemistry and Catalysis, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59-67, 1025 Budapest, Hungary;bDepartment of Biological Nanochemistry, Institute of Nanochemistry and Catalysis, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59-67, 1025 Budapest, Hungary;cDepartment of Plasma Chemistry, Institute of Materials and Environmental Chemistry, Chemical Research Center of the Hungarian Academy of Sciences, Pusztaszeri út 59-67, 1025 Budapest, Hungary;dDepartment of Metallurgical and Foundry Engineering, Faculty of Materials Science and Engineering, University of Miskolc, A/4 Building, 3515 Miskolc, Hungary |
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| Abstract: | High porosity and intense galvanic function related low electrolytic barrier profile and fast delamination of zinc-rich paints (ZRPs) are addressed by the utilisation of intimately structured, highly dispersed, polypyrrole (PPy) deposited alumina particles (PDAPs) embedded zinc-rich hybrid paints. The more globular but less-packed structure type PPy-contained water-solvent-prepared PDAPs-composited hybrids comprising spherical zinc pigment at 70 wt.%, provided moderate galvanic function with enhanced electrolytic barrier properties. In addition, the less globular structured but well-packed PPy-comprised aqueous ethanol-solvent-prepared PDAPs-composited hybrid coatings indicated highly efficient suppressed galvanic function and improved barrier properties, realising solid performance improvement over conventional ZRPs in immersion and salt-spray chamber tests. Furthermore, the application of highly dispersed PDAPs at a content of 3.2 wt.% while PPy incorporated into zinc-rich hybrids at 0.16 wt.% is proposed to result in emerging additional functionalities increasing long-term anticorrosive performance of ZRPs by inhibiting sacrificial and self-corrosion of zinc and scavenging oxidative radicals thereby hindering oxidative degradation of the organic binder. |
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| Keywords: | A Cold-rolled steel A Polypyrrole B XPS B RF GD OES C Cathodic protection C Hybrid paints |
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