| abstract |
Coating compositions suitable for the coating of metal substrates, preferably steel substrates, to be produced and overcoated, i) zinc powders and / or zinc alloys, and ii) the total dry weight of the silane compound (s) and colloidal silica particles The silane compound comprises a modified silica sol comprising colloidal silica particles modified with 6 to 40% by weight of one or more silane compounds, and at a rate of 20 or less silane molecules in 1 hour per 1 nm 2 of the colloidal silica surface. A coating composition obtainable by adding (s) to a silica sol. This coating composition has a relatively long shelf life, good white rust resistance, and good film properties.n n n Metal substrates, coating compositions, silane compounds, silica sol, zinc powder, white rust resistant |