As a substitute for the chromate conversion anticorrosive systemCRM has developed a new conversion coating based on silica nanoparticles.This new process will be implemented on galvanizing linesjust after the zinc bath where the metal strip is still hot. The strip isdipped into a batch containing a suspension of these nanoparticles.Thanks to the strip heat, the solution is locally destabilized and thenanoparticles precipitate onto the metal. The result is an ultra-thincoating (50-200 nm), very compact, that can provide excellent paintadhesion and anticorrosion properties.