Silane coatings with active ions

The addition of active ions, i.e. ions with well-known corrosion inhibition ability like cerium, zirconium or lanthanum to the silane formulations has been proposed previously by the current authors [61,62]. The aim of this procedure is to introduce a new functionality in the silane coating, making it more effective against corrosion. It is expected that these active species become trapped in the siloxane network, being released to the active corrosion sites, where they can develop its anti-corrosion ability. Furthermore, an improvement in the barrier properties of the coating is also expected due to its reduced porosity, increased thickness and decreased conductivity. 

The ability of silane coatings modified with cerium ions to inhibit corrosion activity was also tested, with success, for magnesium alloys [65]. AZ31 Mg alloys coated with a silane layer containing cerium ions revealed improved corrosion performance in electrochemical impedance tests. Furthermore, SVET measurements also showed... 

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