| 摘要 |
Metals below and including magnesium in the electromotive series, and alloys thereof, are coated with a film of a secondary and/or tertiary aminoalkyl silicon compound containing the group: >N-R-Si, wherein R is a divalent saturated hydrocarbon radical having a chain of at least 3 carbon atoms and wherein nitrogen is attached to at least a third carbon atom removed from silicon, wherein at least one of the free bonds of the nitrogen is bonded to an aminoalkyl radical or a hydrocarbyl, amino-alkyl or [-(CH2)aSi] radical wherein "a" is an integer having a value of at least 3, and wherein at least one free bond of silicon is attached to an alkyl radical or silicon through Si-O bonds and the remaining free bonds of silicon are attached to a hydrocarbyl group; the compound is cured to form an adherent coating. Specified metals include magnesium, aluminium, zinc, chromium, steel, tin, tinplate, terne-plate, lead, copper, brass, bronze, p silver, silver plate or sterling silver. The aminoalkyl silicon compounds may be employed as monomers, polymers or copolymers. In an example, copper panels are treated with mixtures of water, alcohol, and N-betaaminoethyl - gamma - aminopropyl - trimethoxy - silane, N-beta-aminoethyl-gamma-amino-butylmethyl diethoxysilane, or N-gamma-aminopropyl-gamma-aminobutyl triethoxy-silane, airdried, and cured in an oven at 150 DEG C. The treated panels have improved corrosion-resistance. |
