| 摘要 |
A corrosion-inhibiting composition comprises a blend of particles of two amorphous silicas; one containing corrosion-inhibiting cations releasable by ion-exchange and the second being substantially free of any corrosion-inhibiting ions. The weight ratio of the cation-containing silica to non ion containing silica is in the range 20:80 to 60:40. The corrosion-inhibiting composition may be incorporated into liquid media and protective coatings, which are based on film-forming polymers e.g. epoxy resins, vinyl resins, epoxy esters. The amorphous silica used is preferably of a microporous type. Calcium cations are the preferred corrosion inhibiting cations. The composition is preferable used to inhibit corrosion of aluminium surfaces. |
