Abstract: An aluminum substrate for magnetic recording media such as magnetic disks, etc., is composed of an aluminum alloy plate containing 2 to 6% by weight magnesium and impurities in only limited amounts and having on the surface an anodic oxidation film with thickness more than 3 .mu.m formed by a chromic acid process. In the thus-anodized aluminum substrate, the occurrence of black spot defects is greatly reduced and the formation of cracks upon heating the substrate to high temperatures is prevented in spite of the thicker anodic oxidation film.

Abstract: Molten metal is supplied into a mold having an inlet and an outlet opening in such a manner that the molten metal may have a substantially zero pressure at the outlet opening of the mold, while the inner wall of the mold is maintained at a temperature sufficiently higher than the solidifying temperature of the molten metal so that the contiguous surface of the metal remains liquid until it has left the molten outlet. A dummy bar having a temperature lower than the solidifying temperature of the molten metal is brought into contact with the molten metal at the outlet opening of the mold, and moved away from the outlet opening, whereby a solidified body of the metal is formed continuously on the end of the dummy bar.

Abstract: An aluminum article is protected against electrochemical corrosive attack by an aqueous medium with which the article is at least partially in contact by the steps of observing the cathodic potential of the article relative to a reference electrode in contact with the medium; when the observed cathodic potential of said article approaches the potential at which pitting corrosion of the same is initiated, electrically connecting said article directly to a source of potential electronegative with respect to the observed potential of the article to repress the cathodic potential of said article to within the alkali corrosion range; and after the cathodic potential is repressed within the alkali corrosion range, disconnecting the article from said electronegative potential source to allow the article to gradually return to its natural cathodic potential in the medium.

Abstract: An aluminum substrate suitable for making high-density magnetic recording media is produced by anodizing a surface of the aluminum substrate in an aqueous chromic acid solution at an electrolytic voltage higher than 60 volts. The anodic film thus formed has no black spot defects and also exhibits no cracks when the substrate is heated at a high temperature for forming a magnetic recording layer.The effect is further improved by adding a small amount of oxalic acid to the electrolyte.

Abstract: An aluminum alloy for casting purposes contains over 6% and up to 13% by weight of silicon, over 2% and up to 5% by weight of copper, over 0.25% and up to 1% by weight of magnesium, over 0.1% and up to 0.5% by weight of nickel, and over 0.03% and up to 1% by weight of antimony, in addition to aluminum and impurities. The copper and magnesium have a ratio by weight of about 3:1 to 8:1.

Abstract: A cast article of aluminum alloy is produced by pouring into a mold a molten Al-Si-Mg type casting alloy having an antimony (Sb) content in the range of about 0.03%-1.0% by weight and, while the alloy cast body is cooling following complete solidification but before its temperature has fallen below 450.degree. C., placing the solidified cast body into a heating furnace kept at temperatures in the range of from 500.degree. to 550.degree. C. and retaining it at an intermediately high-temperature within that temperature range for not more than 30 minutes, subsequently quenching said cast body in cold water or hot water and thereafter subjecting the quenched cast body to a conventional artificial aging treatment.The resulting cast articles are, in terms of strength, toughness and resistance to thermal shocks, comparable with or superior to cast articles obtained by conventional methods but can be manufactured in a reduced period of time with consequential savings in cost.

Abstract: A cast article of aluminum alloy is produced by pouring into a mold a molten Al-Si-Cu type or Al-Si-Cu-mg type casting alloy having an antimony (Sb) content in the range of about 0.03%-1.0% by weight and, while the alloy cast body is cooling following complete solidification but before its temperature has fallen below 450.degree. C., placing the solidified cast body into a heating furnace kept at temperatures in the range of from 480.degree. to 530.degree. C. and retaining it at an intermediately high-temperature within that temperature range for not more than two hours, subsequently quenching said cast body in cold water or hot water and thereafter subjecting the quenched cast body to a treatment for artificial aging at temperatures in the range of from 140.degree. to 230.degree. C. for a period in the range of from one to 12 hours.

Abstract: The invention comprises an improved method for producing anodized aluminum articles colored by means of optical interference effects. The method comprises the steps of subjecting an aluminum article that has been anodized by conventional process to a treatment for modifying the pore structure of the anodic film, thereafter subjecting it while connected as anode to an electrolytic treatment for modifying the barrier layer between the oxide and the metal substrate and finally coloring the article while connected as cathode in an electrolyic bath containing one or more dissolved metal salts using DC current on which is superimposed a train of positive current pulses.

Abstract: Disclosed is a method of coloring an anodized and anodically reinforced aluminum or aluminum alloy article by cathodic treatment in a coloring solution wherein the cathodic electrolytic current is a negative voltage direct current having a duration substantially less than the interval therebetween and being repeated at a frequency sufficient to produce the required coloration.

Abstract: A post for a guard rail used on a highway. Said post is made of an aluminum cast alloy, and is formed in an I-shape in a horizontal cross section, having a central web and front and rear flanges, and being wider at its lower portion. A mechanical neutral plane of the post along the widthwise direction thereof is formed in an S-shape, so as to provide sufficient plasticity and supporting ability to absorb an impact load of a vehicle and to protect a driver from injury.

Abstract: A flashing construction for a curtain wall utilizing The Equal Pressure Principle. Said flashing construction comprises a plurality of vertical mullions disposed parallel to each other and panels being mounted between said mullions. An enclosed vertical space is formed between the mullion and the panel; also, intake ports to the open air are provided on the mullion, whereby said vertical space is connected to the open air through said intake ports. As a result, the pressure in said vertical space is equalized to that of the open air.

Abstract: This invention relates to a method of using "red mud", i.e., slurry by-products from the Bayer process for extracting alumina from bauxite, for creating landfill. The red mud is first filtered to reduce its water content in the conventional manner and then mechanically compressed and dewatered until it has a void ratio less than 1.5, preferably, 1.0 to 1.5, and has the form of solid cakes or other bodies. The red mud cakes are easy to handle and are useful as a landfill material for reclaiming land when applied with light tamping or compacting.

Abstract: An aluminum electrolytic cell wherein, in a sealed type electrolytic cell having a raw material aluminum chloride feeding port and chlorine gas discharging ports in a top section and a molten metal reservoir in a bottom section and provided with an electrode element in the intermediate section so that a molten salt electrolytic bath containing aluminum chloride is electrolyzed in the cell and molten aluminum is collected from the metal reservoir in the bottom section, the electrode element is formed of funnel-shaped electrodes laminated at a fixed distance between the electrodes or a pair of right and left electrode plate groups opposed to each other at a fixed separation between them and inclined to be lower inward at least one intermediate bi-polar electrode is provided between both cathode and anode and a gas rising passage is formed between the outer edges of the funnel-shaped electrodes or the electrode plates and inner wall of the cell to prevent the rechlorination of the aluminum after electrolysis.

Abstract: A process for producing aluminum by electrolyzing fused aluminum chloride together with an alkali metal halide to produce chlorine gas at the anode surface and molten aluminum at the cathode surface where the electrolytic bath is of a molten mixed salt consisting essentially of 2 to 15% by weight AlCl.sub.3, 15 to 70% by weight CaCl.sub.2 and/or MgCl.sub.2, provided the amount of CaCl.sub.2 does not exceed 40% by weight, and 83 to 15% by weight NaCl. Metallic aluminum can be produced by electrolyzing aluminum chloride at a high current efficiency reaching about 90 to nearly 100%.

Abstract: Die-cast aluminum alloy products of excellent toughness and high strength are obtained from an alloy consisting essentially of 7 to 12% of Si, preferably 8 to 10% of Si, 0.2 to 0.5% of Mg, preferably 0.25 to 0.35% of Mg, 0.65 to 1.2% of Fe, preferably 0.7 to 1.0% of Fe and 0.55 to 1.0% of Mn, preferably 0.6 to 0.8% of Mn, the balance being Al and impurities. These products are produced by die-casting a molten aluminum alloy of this composition into any desired shape employing the known pore-free die-casting process with oxygen gas as the reactive gas and subjecting the cast product to solution heat treatment at a temperature ranging from 450.degree. to 530.degree. C, and then aging at a temperature ranging from 150.degree. to 230.degree. C, to thereby improve the toughness and high strength thereof.

Abstract: Electromagnetic effects are optimized in a rectangular aluminum reduction cell arranged in series in a row of such cells with the cathode collector bars thereof extending through the cell cathode parallel to the row length by utilizing generally L-shaped cathode bus bars connecting the upstream ends of the cathode collector bars to line bus bars adjacent the cell ends, the L-shaped cathode bus bars each having one leg extending from its connectors with the upstream ends of at least one cathode collector bar beneath the cell to approximately the longitudinal cell axis and the other leg extending to the right or left generally along said longitudinal cell axis to connect with a line bus bar. The downstream ends of the cathode collector bars are arranged in conventional fashion. The present arrangement minimizes wave formation in the aluminum layer and promotes circulation of the electrolytic bath.

Abstract: A flashing construction for a curtain wall utilizing The Equal Pressure Principle. Said flashing construction comprises a plurality of vertical mullions disposed parallel to each other and panels being mounted between said mullions. An enclosed vertical space is formed between the mullion and the panel; also, intake ports to the open air are provided on the mullion, whereby said vertical space is connected to the open air through said intake ports. As a result, the pressure in said vertical space is equalized to that of the open air.