Abstract:
A coating composition for imparting improved salt spray resistance to a part comprising a) phosphate ion and chromate ions or molybdate ion in an aqueous solution, and b) particulate of a leachable chromate pigment, and the coatings and coated parts formed therewith.
Abstract:
Method for localized aluminide coating applied for the first time or as repair includes creating a contained space by disposing coating material comprising an aluminum source and a halide activator at least partially over and in an out-of-contact relation with a target surface of a metal substrate. Heating the substrate to a temperature to cause the aluminum source to react with the halide activator and the substrate results in diffusion aluminide coating of the targeted surface. An article comprising a target surface of a metal substrate, said surface bounding a contained space, and a coating tape comprising an aluminum source and a halide activator and disposed in an out-of-contact relation at least partially over the contained space whereby, when the substrate is heated to a temperature to cause the halide activator to react with the aluminum source, a diffusion aluminide coating is formed on the target surface.
Abstract:
A silicon-enriched aluminide coating for a superalloy article has a composite microstructure including a plurality of bands of silicon rich phases (S1, S2, S3) and a plurality of bands of aluminum rich phases (A1, A2, A3), these bands being spaced apart through the thickness of the coating. The composite microstructure is created by depositing a slurry containing both silicon and aluminum in elemental or pre-alloyed form on the article and heating the coated article above the melting temperature of aluminum to cure the coating, the depositing and curing steps being repeated at least once before diffusion heat treating the resulting layers. Thereupon, all the above process steps are repeated at least once.
Abstract:
A stable thixotropic coating composition especially suitable for dipspin application which comprises (a) an acid binder aqueous solution which comprises phosphate ions and ions of the group of chromate ions or molybdate ions, (b) an acid-stable, non-colloidal amorphous silica and (c) a nonionic surfactant; a method for coating an article by dipspin application of said composition and parts coated therewith.
Abstract:
A liquid aqueous coating composition especially useful for creating a porous coating on a surface by means of a fugitive material which is removable from the coating to create porosity, which composition comprises (a) an aqueous inorganic curable binder (b) a fugitive particulate material which is a polymeric synthetic resin which is insoluble and stable in the binder, which fugitive particulate material is removable from the coating prior to, during or after its curing to a coating on the substrate. The invention relates also to a method for manufacturing said article and a composition useful for said method.
Abstract:
A coating composition especially suitable for a machinable aluminium-filled coating possessing improved salt corrosion and oxidation resistance having a liquid binder which comprises phosphate ions and ions of the group of chromate or molybdate ions, and an atomized aluminium powder having an average particle size (as expressed in terms of the median equivalent spherical diameter ( ESD ), that is greater than at least 15µm, and having a size distribution such that at least about 5% of the particles by weight are retained on a 325 mesh screen, and the coatings and parts formed therewith.