Abstract: A one side plated metal of excellent appearance and quality can be obtained by dipping the material into a plating bath. In this case, one side of the material is oxidized just before it enters the bath so as to form an oxide film on that side and leave it unplated. As soon as it is pulled up from the bath it is maintained under reducing atmosphere so as to prevent adherence of the plating metal to the oxide film.

Abstract: The heat treatment of a continuous band or sheet of metal as the same travels through a plurality of stages in a protective atmosphere, between conveying rollers, by applying direct-current electricity to the rollers for inclusion of the travelling sheet in the circuit therebetween. The charged rollers in the initial stage are spaced more widely from one another than those in the later stage, to compensate for the lower resistivity of the metal in the former, so that the Joule effect of I.sup.2 R factor in the stages are substantially equalized. The protective atmosphere of oxidizing, reducing or inert gases which encompasses the sheet, is confined in chambers of galvanized iron sheeting and the like, the walls of which are in close proximity to the travelling sheet, so that lesser amounts of reacting gases are necessary.

Abstract: A partially alloyed galvanized ferrous strand and a method for its production. The method is characterized by the steps of immersing a clean and oxide-free ferrous strand in a molten zinc galvanizing bath to produce on the strand a coating weight of between 0.2 and 0.5 oz. per square foot. After immersion, the zinc-coated ferrous strand is heat treated and cooled to produce a galvanized coating on said ferrous strand, which coating has a duplex structure characterized by an iron-zinc intermetallic layer consisting essentially of the zeta phase, an overlay of free zinc, and an average iron content between about 2 and less than 4% by weight.

Abstract: This invention relates to a method of hot-dip coating a ferrous strand. The strand is passed through a furnace in which the strand is heated, passed through a second furnace in which the strand is subjected to a reducing atmosphere and then passed through a protective hood and into the molten bath of aluminum-zinc alloy. A preheated reducing gas is introduced into the protective hood so as to sweep across and cover the surface of the molten bath within such hood prior to passing upwardly through it and the second furnace countercurrent to the movement of the strand. The preheated reducing gas has a temperature of at least 750.degree. F, a dew point no greater then 0.degree. F and is composed of at least 20% by volume of hydrogen, balance essentially nitrogen.

Abstract: A method of continuous galvanizing a steel strip partially or one side, which comprises applying silicone resin to a part or on one side of the steel strip which is to be left non-plated in a subsequent continuous molten zinc coating, baking the silicon resin coated steel strip at a temperature ranging from 300 to 800.degree. C in an oxidizing atmosphere, and subjecting the steel strip to heat treatment in a reducing atmosphere and introducing the heat treated steel strip to a zinc coating bath.

Abstract: A metal coating is deposited on a metal substrate by means of a method which consists in sand-blasting the metal substrate, in heating the substrate to a temperature between 100.degree. and 650.degree. C, then in spraying a powder of nickel or cobalt alloy having a high value of hardness and containing reducing agents as well as agents for reducing the melting point, the spraying operation being performed at a distance of 50 to 200 mm from the nozzle of a spray-gun and at a velocity within the range of 100 to 250 meters per second.

Abstract: Steel strip at around 1000.degree.F. or higher is run into a galvanizing pot maintained at a higher than conventional temperature to cause alloying of the iron with the spelter on the surfaces of the strip, the strip being passed through a zone of cooled molten spelter before being withdrawn from the galvanizing bath, the steel strip issuing from the bath having an inner iron-zinc alloy coating and an outer molten spelter coating, substantially all the molten spelter coating being removed from at least one surface of the strip by a stream of gas under pressure. Where molten galvanizing spelter coating is left on one side, the weight of the molten layer averages at least 1/10th of an ounce per square foot of coated surface.

Abstract: In a continuous hot-dip galvanizing process, the temperature of a travelling steel strip just before said strip is introduced into a molten Zn bath is controlled below the bath temperature, preferably at 380.degree.C. to 420.degree.C., to avoid generation of dross in said bath and impairment of said galvanized film.

Abstract: Coating of steel articles with zinc-tin alloys by hot-galvanizing with addition of aluminum to improve the applicability and adhesion of the coating as well as the corrosion resistance, coated surface appearance and formabilities thereof.

Abstract: A method and means of continuously applying molten coating metal, as in galvanising of tubes or members passing through the galvanising bath in a straight line. The molten metal in a reservoir is discharged onto the tube or rod; flow around the tube or rod is controlled by a splash tube. A coating of desired thickness is attained by use of a cooperating die and air knife.

Abstract: Galvanising fluxes consisting of zinc chloride, one or more of sodium, potassium, calcium and magnesium chlorides, and an acid or acid salt (preferably aluminium chloride). In solution in water, the pH of the solution is less than 5.

Abstract: A method of preparing carbon steel strip and sheet for hot dip metallic coating in a Selas-type direct-fired furnace, wherein the atmosphere in the furnace is controlled to contain from about 3% oxygen to about 2% excess combustibles by volume, thereby forming a thin iron oxide film on the carbon steel surfaces. The strip and sheet is then heated in a subsequent furnace containing at least 5% hydrogen by volume at a temperature sufficient to reduce the oxide film, viz., at least about 675.degree.C. The direct-fired furnace is preferably operated at stoichiometrically equivalent fuel:air ratios.

Abstract: A method of preparing carbon steel strip and sheet for hot dip metallic coating in a Selas-type direct-fired furnace, wherein the atmosphere in the furnace is controlled to contain from about 3% oxygen to about 2% excess combustibles by volume, thereby forming a thin iron oxide film on the carbon steel surfaces. The strip and sheet is then heated in a subsequent furnace containing at least 5% hydrogen by volume at a temperature sufficient to reduce the oxide film, viz., at least about 675.degree. C. The direct-fired furnace is preferably operated at stoichiometrically equivalent fuel:air ratios.