METHOD FOR PREPARING A SOL-GEL SOLUTION AND USE THEREOF TO FORM A METAL SUBSTRATE PROTECTIVE COATING

摘要

The invention concerns a method for preparing a stable sol-gel solution including the following successive steps: a) preparing a sol-gel solution by contacting one or more metal and/or metalloid precursors with a medium comprising an organic solvent; b) adding to the solution obtained at a) at least one mercaptoorganosilane compound; c) hydrolyzing the solution obtained at b); d) adding to the solution obtained at c) one or more complexing agents selected among carboxylic acids, ß-diketone compounds, hydroxamate compounds. The invention also concerns the use of said solution for forming coating materials for metal substrates, in particular silver-based substrate, such as mirrors.