Silicate coating compositions
OwnerRonald R. Savininventor
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Abstract
Aqueous zinc-containing coating compositions are provided in which the bonding agent is a blend of sodium and/or potassium silicate and lithium polysilicate the latter being in relatively high proportion particularly over 30% up to 70% by weight of silicate. Preferably the composition contains particulate flaked zinc. The composition is of particular value in enhancing corrosion resistance of articles produced from powdered metal or of non-passivated galvanized artefacts.
Claims13
A method for protecting the surface of a powdered metal artefact which comprises applying thereto a coating composition comprising an aqueous containing zinc particles and as bonding agent for the composition a mixture of sodium or potassium silicate and sufficient lithium polysilicate to achieve an adhesive cured coating.
A method according to any one of the preceding claims wherein a vacuum is applied to the artefact prior to or during application of the coating composition.
An aqueous coating composition comprising zinc flake and as bonding agent for the composition a mixture of lithium hydroxide, sodium or potassium silicate and sufficient lithium polysilicate to achieve an adhesive cured coating.
A non-foaming aqueous coating composition comprising an aqueous dispersion of zinc particles and a mixture of sodium silicate or potassium silicate and sufficient lithium polysilicate to achieve an adhesive cured coating, lithium hydroxide and a surfactant.
A method of coating a non-passivated galvanized artefact which comprises (a) applying to said artefact a non-foaming aqueous coating composition comprising a mixture of sodium silicate or potassium silicate and sufficient lithium polysilicate to achieve an adhesive cured coating, lithium hydroxide and a surfactant and (b) curing said composition on the artefact at a temperature of from 250 to 350° F.
A powdered metal artefact having a surface coating which comprises zinc particles and a mixture of sodium or potassium silicate and lithium polysilicate.
An alkyl silicate coating composition comprising 100 parts by weight of a silicate solution containing 20 to 25% by weight alkyl silicate, 50 parts by weight zinc flake, 50 parts by weight zinc dust and 2 parts by weight of a wetting and dispersing agent.
Dependencies are inferred from the claim text.