Abstract: Metallic surfaces are imparted to non-conductive or dielectric substrates by an electroless (chemical) coating process comprised of coating the surface of the substrate with colloids of catalytic non-precious metals wherein the metals are either part of an alloy or in the elemental state or a compound and wherein the colloidal compositions are prepared by a special method which renders the colloids a greater catalytic activity when used in the plating process.

Abstract: A gas phase aluminizing process for alloys based on Group VI B and VIII metals such as chromium, iron, cobalt and nickel is disclosed. The process is particularly useful in the coating of internal passages of complex high temperature gas turbine hardware such as blades and vanes, where it has been found that the complex aluminum halide activators used herein have a "throwing power" greater than was heretofore obtained with the conventional halide activators such as ammonium chloride in the gas phase process.

Abstract: Steel, aluminum and aluminum alloys, zinc and zinc alloys are treated to improve corrosion resistance with an aqueous solution of a fluorophosphate salt to passivate the metal surface, before or after phosphatizing and prior to painting.

Abstract: Substrates are coated with a composition comprising a low molecular weight polyethersulphone containing hydroxyl and groups and having a reduced viscosity of less than 0.25 (as measured at 25.degree. C on a solution of the polymer in dimethyl formamide containing 1 g of polymer in 100 cm.sup.3 of solution) and a fluorocarbon polymer dispersed in an aqueous medium, drying the coating and thereafter baking it in air at 420 to 450.degree. C.

Abstract: A ceramic electric resistor and a method for making the same. The resistor has a body which is formed of a material having a Perovskite structure with semiconducting doping and on its surface is contacted with two layers of different materials. The first layer is palladium or in association with palladium chloride and the second layer is one from a group of nickel, nickel-phosphorus or nickel-boron alloys. The process includes stoving-in the palladium or palladium chloride solution and providing a given composition of nickel bath for the second layer.

Abstract: This invention relates to a composition and method for coating aluminum in order to improve both corrosion resistance and paint adhesion. By using very low concentrations of hexavalent chromium ions, phosphate ions and fluoride ions in the coating composition, the characteristics of the treated aluminum surfaces are improved, while process waste disposal problems are minimized.

Abstract: A method for the formation of novel colloidal catalytic electroless plating compositions comprises admixing a highly stable non active (weakly active) colloidal dispersion with a reactivity modifier. The admixture so formed is used in electroless plating processes wherein a substrate is contacted with the novel colloidal catalytic composition, rinsed, contacted with a reducing or activating solution (which may be optional) and then contacted with an electroless plating solution.

Abstract: A process for phosphate conversion coating iron and steel which includes a multi-step water rinsing stage after the conversion coating stage, which comprises subjecting a part of the rinsing water used therein to a reverse osmosis treatment, returning the concentrated liquid thereof to the conversion coating stage, and using the filtrate as replenishing water for the conversion coating and/or the degreasing and water rinsing stages after subjecting it to an ion exchange treatment.

Abstract: A method of draining parts emerging from hot galvanizing baths using a range of vibration excitation frequencies capable of covering the fundamental frequencies of the parts to be drained. Three different methods are disclosed. According to a first method the vibrations are obtaining by exciting with a narrow band white noise the support for the parts to be drained. According to a second method, the vibrations are produced from a single exciter fed with narrow band white noise and energizing vibrators through the medium of amplifiers. According to a third method, the vibrations are produced by a number of small vibrators each of which furnishes one of the frequencies of the chosen spectrum, whereby said vibrators jointly synthesize the narrow band white noise.

Abstract: A ferrous metal strip is continuously hot-dip coated with a zinc-aluminum alloy by immersing the metal strip in a hot-dip coating bath containing between about 0.2 wt. percent and 17 wt. percent aluminum, between about 0.02 wt. percent and 0.15 wt. percent lead, and between about 0.03 wt. percent and about 0.15 wt. percent magnesium with the balance essentially zinc. In a further embodiment the hot-dip alloy coating can also contain between about 0.1 wt. % and 0.3 wt. % copper. The resulting hot-dip zinc-aluminum alloy coatings when applied to a ferrous metal strip exhibit good resistance to intergranular corrosion and blistering when exposed to a high humidity atmosphere and form smooth surface coatings which have good formability both in the "as coated" state and after prolonged storage in a high humidity atmosphere.

Abstract: A method of coating marine structures including marine vessel hulls is disclosed, the method comprising painting the surfaces of the structure to be exposed to fouling conditions in salt water including sea water and brackish water, with a paint containing certain 3-isothiazolones in an amount to control marine plant and animal life such as algae, hydroids, and barnacles.

Abstract: An improved method for forming a metal-silica coating solution having particular utility in the formation of metal-organo-silicate films on semiconductor surfaces is disclosed. The method comprises the steps of forming a mixture of a first solution having a metal salt and a cross-linking agent dissolved therein and a second solution having an organo-silicate dissolved therein, and aging the mixture a predetermined length of time. This mixture can then be applied to the semiconductor surface where cross-linking takes place such that a viable film is formed. Further heating of the semi-conductor device causes a metal film to be formed which is in turn diffused into the semiconductor device. By the use of the metal-silica solution, an improved method for diffusing metal atoms into silicon for lifetime control is achieved.

Abstract: Compositions for forming chromate coatings on zinc metal or zinc alloys typically contain water as a solvent with hexavalent chromium compounds therein as active ingredients. Such hexavalent chromium compounds are environmentally undesirable. An aqueous composition for forming a chromate coating on zinc metal or zinc alloys is provided which does not contain hexavalent chromium compounds. The composition contains a trivalent chromium compound, an alum and a vanadate.

Abstract: There is provided a boriding agent for mass produced parts of ferrous and non-ferrous metals consisting essentially of a boron yielding material, activator, filler and water as a binder and containing in the boriding agent 2 to 8 weight % of pyrogenic silica.

Abstract: Anti-plating agents which form, after heated, compounds having a composition of(0.5-9.0)M.sub.2 O.SiO.sub. 2.(0.1- 7.2)B.sub.2 O.sub.3.(1.0- 34.5)MgOwherein M represents an alkali metal, are disclosed. An anti-plating film formed on the surface of a steel sheet by the use of the agent is excellent in the property for preventing the sheet from being plated and in the peeling property from the sheet, and the agents are suitable for production of one-side hot-dip plated steel sheets.

Abstract: A protective sacrificial coating is provided for metal substrates, e.g. ferrous metal substrates, such as compressor discs or blades for jet engines, the sacrificial coating comprising an intermetallic compound of magnesium with a coating metal, the coating being anodic to the substrate metal, the coating being optionally covered with an adherent non-metallic overcoat of, for example, a conversion coating.

Abstract: Phosphated ferrous metal surfaces are treated with a rinse containing citric acid and sodium nitrite to enhance corrosion protection. This rinse has the advantages of providing an effluent which is not objectionable from an environmental viewpoint and does not stain the treated surfaces.

Abstract: A method of making an optically black surface having a low reflectance of electromagnetic radiation, especially in the solar spectrum, a relatively high heat resistance, and a relatively low amount of off-gassing and an optically black surface made by the method which includes the steps of(a) Milling the following mixture of ingredients for up to about 25 minutes:______________________________________ Ingredient Amount (% by weight) ______________________________________ Alkali metal silicate 13-21 Black pigment 17-27 Kaolin 0-5 Mica 0-3 Water 50-70 ______________________________________(b) Coating the surface to be rendered optically black(1) by applying at least four or five coats of an inorganic composition comprised primarily of an alkali metal silicate and pigment, and(2) by spraying at least the last two surface coatings, and having them comprise the above milled mixture, and(c) Drying at least the coats prior to the last two coats, before applying the last two coats.

Abstract: A chromium-containing coating composition, also containing pulverulent metal, will provide a coating of excellent corrosion resistance when the composition contains urea as at least a part of the reducing agent, and when the composition also contains particular pH adjusting agent. The reducing agent of the composition is used in regard to the hexavalent chromium contained in the chromium portion of the composition. The pH adjusting agent should be a compound of zinc. In addition to achieving excellent corrosion resistance, resulting coatings can provide the other desirable characteristics for coated substrates, such as topcoat adhesion and formability, without deleterious effect.

Abstract: A cathode electrode of copper-based material adapted for use in an electrical device is provided with a layer composed of at least one compound from the group of copper selenide, copper telluride and copper sulfide by the reaction between the copper-based cathode electrode and an appropriate reactive compound of selenium, tellurium or sulfur. When utilized in an electrolytic capacitor, the layer on the cathode electrode helps to depolarize the capacitor and helps to increase the capacitance of the cathode electrode.