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New sol–gel coatings for the corrosion protection of aluminum pigments were developed. To this end, the pigment particles are first coated with a silica layer by phosphoric acid-catalyzed sol–gel processing of Si(OEt) 4 , to which either hexadecyltrimethoxysilane or dimethyldimethoxysilane is condensed. The coated pigments have excellent anticorrosive properties in alkaline solutions as well...
The effect of different acid pre-treatment procedures on the corrosion of magnesium AZ31 alloy was compared by measuring the amount of hydrogen gas formed when the surface was in contact with aqueous 5% sodium chloride solution. A 4–7μm thick sol–gel coating prepared by phosphoric acid catalyzed sol–gel processing of a methyltriethoxysilane/tetraethoxysilane mixture was applied to the differently...
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