Abstract: A method for the diminution of high temperature oxidation in an iron alloy ontaining chromium consisting of at least partially enclosing the alloy and a volatile inorganic boron compound, heating the boron compound and allowing the volatile constituent of the boron compound to contact at least one surface of the alloy.

Abstract: Resistance of iron, iron-chromium and iron-chromium-nickel alloys to corrosive attack by sulfur compounds at temperatures above 500.degree. F. is improved by pretreating the metal under controlled conditions to form an extremely thin submicroscopic oxide film which serves as a corrosion resistant barrier.

Abstract: For treating a steel sheet for subsequent enamelling of the sheet with one coat of enamel: After rolling the sheet, there is deposited thereon a coat of nickel and/or cobalt, a salt of said metals or mixtures of said salts. After drying, the sheet is annealed in a decarburizing atmosphere so as to substantially totally decarburize it and, during the cooling of the annealing cycle, the coated sheet is subjected to the action of an oxidizing atmosphere containing 2 to 7% of water vapor and having an H.sub.2 /H.sub. 2 O ratio which is less than 6.

Abstract: Fouling is at least minimized when heating in a distillation unit a stream comprising C.sub.4 or C.sub.5 diolefins by a method wherein said distillation unit is flushed with an inert gas, thereafter nitric oxide is introduced in an amount ranging from 0.15 to 500, preferably from 5 to 30 gm of nitric oxide per square meter of internal surface area of said heating unit, the heating unit is thereafter flushed with inert gas and the C.sub.4 or C.sub.5 diolefin stream is introduced into the heating unit. This method may be applied to a depropanizer or a debutanizer the desorber and re-distillation of the CAA process for butadiene recovery, the extractive distillation, stripping tower and re-distillation of the ACN process for isoprene recovery, or extractive distillation, stripping tower and re-distillation of the ACN process for isoprene recovery.

Abstract: A method of producing highly abrasion resistant plastification screws and plastification cylinders for injection molding machines in which plastic materials with abrasive fillers are processed, the machined plastification elements being borided in a boron carbide packing and then hardened or tempered, the method involving the selection of a tool steel or temper steel whose austenitization temperature is below the highest boriding temperature, so that the elements can be hardened or tempered immediately after the boriding treatment, by chilling them with an inert gas, while they are still in contact with the boriding packing.

Abstract: Using a plasma arc coating process or a thermospraying process or a detonation process an electrode of a rotor of a distributor for the ignition system of an internal combustion engine was surface treated to provide the electrode with a surface layer of an electrically high resistive material, e.g. CuO. A distributor having the treated rotor included therein exhibited significantly suppressed noise. Instead of or in addition to the rotor, each of the stationary terminals of the distributor may be so treated.

Abstract: A coated steel product, namely, a cutting instrument such as a band saw blade, in which the body of the blade is of steel, the tooth tip is of impulse hardened steel and the tip is covered with a coating of titanium carbide or refractory metal carbide, the coating metal or compound having been deposited by ion plating onto the surface of the tip. The process through which the cutting tool is produced includes preshaping and sharpening the tool, then ion cleaning the tips, bombarding the tips with ions of the titanium or refractory metal followed by reacting the titanium or refractory metal with a carbon containing chemical or their carbides and then simultaneously subjecting both the coating and the steel tip to a magnetic flux for impulse hardening primarily the steel tip. Other coatings of metal carbides, nitrides, borides and metal compounds are described.

Abstract: An insulating coating having a high adhesion on an oriented silicon steel sheet, which applies a tension on the surface of the steel sheet and restrains magnetostriction increased when compressive stress is subjected to said oriented silicon steel sheet, is formed by applying a coating aqueous dispersion of 7 - 24% by weight of colloidal silica and 5 - 30% by weight of magnesium phosphate in monobasic magnesium phosphate on the oriented silicon steel sheet and baking the thus treated steel sheet at a temperature of 350.degree. - 900.degree.C. Said coating is more improved by adding 0.01 - 5% by weight of at least one of chromic anhydride, chromates and bichromates to said coating aqueous dispersion.

Abstract: The invention provides a novel method of increasing the corrosion resistance and improving the organic coating characteristics of cold rolled flat steel. In practicing the method, cold rolled flat steel in the as rolled condition having iron oxide and thermally degradable rolling oil on the surface thereof is heat treated at a tempterature sufficiently elevated to thermally degrade the rolling oil. The surface of the cold rolled steel has a relatively low corrosion resistance and relatively poor organic coating characteristics initially, and the heat treatment is continued until the corrosion resistance and the organic coating characteristics of the resulting heat treated steel are improved. Thereafter the heat treated steel is cooled to a temperature sufficiently low to prevent further thermal degradation of the rolling oil and produce a residual film on the heat treated steel surface which imparts corrosion resistance and improved organic coating characteristics.

Abstract: A boiler tube and a method for manufacturing the same are disclosed in which an inner surface of the boiler tube used in the center of a high-temperature, high-pressure boiler is formed with a spinel layer consisting of an oxide of iron, chromium and nickel, which is exposed. The specific method of the manufacture is that after the boiler tube is brought into contact with high temperature steam, a magnetic iron (Fe.sub.3 O.sub.4) layer produced on the inner surface is removed.

Abstract: Outgassing of hydrogen from high-vacuum system components made of stainless steel and similar alloys can be minimized if the metal surfaces to be exposed to the vacuum are treated according to the technique disclosed herein. First, an adherent layer comprising a mixture of oxides and nitrides is formed on the metal surfaces. This oxide and nitride mixture layer serves as a barrier to hydrogen diffusion. Then, a reduced layer having a low heat of adsorption for water is formed on the exposed surface of the oxide and nitride mixture layer. This reduced layer is made sufficiently thin to preclude outgassing of significant amounts of hydrogen into the vacuum system. In effect, a vacuum envelope is formed which outgasses only from a thin layer of reduced oxide.

Abstract: Surfaces of a perforated mask made of iron are allowed to contact with an acidic aqueous solution of antimony trichloride, e.g., a hydrochloric acid solution to form a thin film of metallic antimony on said surfaces. A protective coating of a phosphate is allowed to be deposited onto said thin film. Thereafter, said surfaces is heated in an oxygen atmosphere to produce a grayish black coating having an excellent thermal emission power. The perforated mask thus treated has no permanent deformation like wrinkles produced at a perforated sheet member and is uniform in color.

Abstract: Disclosed is a composite coating for wear surfaces comprising a layer of vapor deposited titanium nitride overlying a layer of titanium carbide. The composite coating is formed by successive chemical vapor depositions of titanium carbide and titanium nitride on a heated substrate.

Abstract: The present invention provides a member having a cutting edge with a boron-containing coating thereon, the coating being up to 600 Angstroms thick. The member may be a razor blade.The invention also provides a method of manufacturing a member having a cutting edge which includes the step of coating the cutting edge with boron to a thickness up to 600 Angstroms.

Abstract: Iron, steel, and iron base alloys are provided with coatings made by forming an adherent oxide layer on the surface, treating the oxide layer with at least one Group III metal, then oxidizing the Group III metal, after which the oxidized Group III metal is treated with pyrochlore-microlite mineral. The coatings are useful for providing corrosion and oxidation resistance, particularly at elevated temperatures.

Abstract: Metal/metal oxide coated articles having selective reflectance and transmittance of radiation over an extended spectral range are provided by a combination of alternately disposed coating layers of metal and metal oxide, the metals of the metal layer being silver, chromium, iron, cobalt or nickel and the metal oxide being copper oxide. Chemical or electroless plating techniques are disclosed for the production of such articles. Uniform oxide coatings are formed by first depositing metal films, then treating them with surfactants to promote uniform oxidation and then exposing them to an oxidizing environment.

Abstract: An improved, cathode ray tube mask assembly having a dark, adherent coating and a method of forming such a coating. A clean mask assembly is treated with a hot solution of chromic and phosphoric acid to form a preliminary protective coating. The mask assembly is then baked to convert the preliminary protective coating to a final dark, very adherent coating.

Abstract: The present method makes it possible to expose or make visible surface defects on or in the surface of steel blanks by heating the blanks to a temperature below the hot working temperature of the particular type of steel and thereafter rapidly descaling the blanks by means of high pressure water which contacts the steel for a limited time so as to avoid a substantial chilling or quenching. After such descaling the blanks are cooled at a controlled rate to thereby produce an oxidation film on the descaled surface which film makes the defects visible.