Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Sol-gel dip coated silicon oxide (SiOx) and multi-component oxide system coatings on Mg alloys

SiOx and multicomponent oxide coatings formed by a especially developed low temperature (less than 180 °C) sol-gel dip-coating technology has been developed based on the precursor: tetraethylorthosilicate and aluminium-sec-butoxide. These precursors have shown themselves to be promising precursors with good adhesion to the Mg alloy substrate.

The corrosion measurements of the SiO2 films containing Al2O3, ZrO2 and CeO2 indicated no pitting on the surface of AZ91D and AZ31 (machined) after 96h exposure to salt spray test compared to the as cast and sand blast samples. Experiments were conducted on the development of multi-component oxides such as Al2O3, SiO2, ZrO2 as well as a highly corrosion resistant polymer layer on top of the metal oxides by sol-gel dip coating technique.

The corrosion and wear resistant results of the multi-component Si-O ¿Al-O films were tested and have shown promising properties. The use of polymer layers was later abandoned due to strict requirements of a principal end-user of the project. This process has been up-scaled to an industrial process capable of coating medium to large areas.

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