Dispersionen für den Korrosionsschutz von Aluminium: Synthese, Charakterisierung und Anwendung

The adsorption and organization of reactive microgels has been investigated on technical aluminium. By means of a two-step emulsion polymerisation with phosphate substituted monomer we obtain polymeric nano-particles with phosphate groups on the surface. In a first step cross-linked butyl acrylate/styrene particles were formed. In a second step a mixture of functionalised acrylate and butyl acrylate/styrene was added to the system. In this way, the composite particles were obtained. Particle size and size distribution were measured by F-FFF and light scattering methods. For phosphate functionalised dispersions, it was possible to show the distribution of P-species around particles by energy dispersive TEM easurements. These nano-particles adsorb spontaneously onto aluminium surfaces from aqeous dispersion. They form well packed layers, which have been proved by SEM measurements. The properties of the adsorbed microgel layers were confirmed by industrial linked adhesion and corrosion tests. Panels with adsorbed phosphate funczionalised particles have an excellent corrosion inhibition effect.