| 摘要 |
The present invention relates to a process for primer coating steel which is intended to be fabricated and overcoated, in which process the steel is prim er coated with a primer coating comprising a silica binder, wherein the binder comprises alumina-stabilized aqueous silica sol and, optionally, a minor amount of alkali metal silicate, said binder having a SiO2/M2O mole ratio, wherein M represents the total of alkali metal and ammonium ions, of at leas t 6:1, and wherein after the primer coating has dried to the extent that it is touch dry, it is optionally treated with a solution which increases the film strength of the primer coating.
|
