Tribology of novel antibiocorrosion coatings

Abstract

We have developed inorganic–organic hybrid bioactive composites and antibiocorrosion coatings based on epoxy or polyurethane matrices modified with varying amounts of a silicon organic oligomer. We have incorporated bioactive compound containing bis(η5-cyclopentadienyl) iron and spatial alicyclic fragment or its coordination compounds of Co and Ni. Glass transition regions located with differential scanning calorimetry (DSC) are above +50°C, so that our hybrids can be used for instance as coatings for museum exhibits. DSC shows also beta transitions in the glassy state around −50°C. Thermogravimetric analysis shows high thermal stability. We have also performed scratch resistance testing with linearly increasing load and sliding wear determination by multiple scratching along the same groove. Also here the hybrid formation enhances the scratch resistance. We observe the strain hardening in sliding wear that is the tendency towards a horizontal groove depth asymptote with increasing number of scratches. Water absorption in 720 h does not exceed 0·03 wt-% in all cases. Samples subjected to three months aging under normal temperature and pressure conditions were observed. The initial colours and optical transparency were preserved; no phase separation took place.