Abstract: In a method of electrodepositing a palladium/nickel alloy coating upon a substrate wherein the coating is plated onto the substrate by electrodeposition from a bath containing 5 to 30 g per liter of palladium and 5 to 30 g per liter of nickel and having a palladium-nickel ratio such that the coating contains 30 to 90% by weight of palladium, the improvement which comprises providing in the bath during the eletrodeposition of the coating at least one sulfonyl urea compound capable of improving the corrision resistance of the coating.

Abstract: A method of electrodepositing a palladium/nickel alloy coating upon a substrate wherein the coating is plated onto the substrate by electrodeposition from a bath containing 5 to 30 g per liter of palladium and 5 to 30 g per liter of nickel and having a palladium-nickel ratio such that the coating contains 30 to 90% by weight of palladium. The bath is provided during the electrodeposition of the coating with at least one acetylene amine or amino alcohol capable of improving the brightness and mechanical properties of the coating.

Abstract: In a method of electrodepositing a palladium/nickel alloy coating upon a substrate wherein said coating is plated onto said substrate by electrodeposition from a bath containing 5 to 30 g per liter of palladium and 5 to 30 g per liter of nickel and having a palladium-nickel ratio such that the coating contains 30 to 90% by weight of palladium, the improvement which comprises providing in said bath during the electrodeposition of said coating at least one acetylene alcohol or acetylene alcohol ether capable of improving the brightness and mechanical properties of said coating.

Abstract: An apparatus for the distillation of vaporizable liquids, for example alcohol, solvents used for the degreasing of metal and the like, comprises a distillation chamber, a heating unit in the region of the bottom of the distillation chamber, a cooling and condensation unit at an upper portion of the distillation chamber and a cold-generating unit. According to the invention, the cold-generating unit is formed as a heat pump with a circulating refrigerant and has a compressor, a cold branch and a hot branch. The cold branch is connected to the cooling and condensation unit of the distillation chamber while the hot branch transfers heat via a heat exchanger to a heat storage device, e.g. a utility water reservoir from which hot water is drawn to heat the heating unit of the distillation chamber.

Abstract: An apparatus for treating articles with a solvent, a solvent-containing liquid such as a lacquer, or with solvent vapors, comprises an open treating vessel provided with a device for raising and lowering the articles in the vessel and a heating unit at the bottom of the vessel for heating solvent therein. Around the wall of the vessel, above the bottom thereof, cooling tubes are provided which are connected to the cold branch of a heat pump so as to condense solvent vapors which can collect in a trough below these tubes and can be returned to a compartment of the vessel adjacent the treating compartment. The hot branch of the heat pump is connected via a heat exchanger to a water boiler and heat storage tank and the heater is connected to this boiler by a pump controlled by a control device responsive to the raising and lowering of the articles.

Abstract: A solar collector has a surface turned toward the sun and forms a heat exchange cell which has at least one wall composed of sheet aluminum. A tramsmitting layer of such a wall or the absorption layer thereof is a black layer of aluminum oxide containing Ag or Sn and formed unitarily on the aluminum sheet, e.g. by a chemical or electrochemical process.

Abstract: An aluminum baking form is provided with internal and external coatings of aluminum oxide which are of black coloration and which contain metals other than aluminum and serve as infrared transmitters or collectors. The metal incorporated in the aluminum oxide layer is preferably tin or silver or both.

Abstract: An aluminum baking form is provided with internal and external coatings of aluminum oxide which are of black coloration and which contain metals other than aluminum and serve as infrared transmitters or collectors. The metal incorporated in the aluminum oxide layer is preferably tin or silver or both.

Abstract: Semibright (matte-gloss) coatings of nickel or nickel-cobalt are deposited on a metal substrate from a WATT'S-type, sulfamate or fluoroborate electroplating bath at a pH of 2.5 to 5.8, a temperature of 15.degree. to 70.degree. C and a current density of 0.5 to 20 A/dm.sup.2 in the presence of a substance which deposits with the metal and ensures a semibright or matte-gloss finish. The substances form in situ within the bath from a cationic or amphoteric first component and a second component consisting of an organic anion interactive with the first component to produce a flocculate.

Abstract: Semibright (matte-gloss) coatings of nickel or nickel-cobalt are deposited on a metal substrate from a WATT'S-type sulfamiate or fluorobate electroplating bath at a pH of 2.5 to 5.8, a temperature of 15.degree. to 70.degree. C and a current density of 0.5 to 20 A/dm.sup.2 in the presence of a substance which deposits with the metal and ensures a semibright or matte-gloss finish. The substances form in situ within the bath from a cationic or amphoteric first component and a second component consisting of an organic anion interactive with the first component to produce a flocculate.

Abstract: A process for the chemical coating of synthetic-resin bodies with nickel or copper utilizing an activation step in which the bath comprises:0.1 to 20 g gelatin or gum arabic as the protective colloid, 1 to 5 g tartaric acid or citric acid, 1 to 5 g sulfuric acid or hydrochloric acid, 0.1 to 5 g palladium sulfate, 1 to 20 g maleic acid or 1 to 6 g fumaric acid as poly basic carboxylic acids, and water to a volume of 1 liter. The subsequent treatment with the chemical plating bath is carried out without an intervening acceleration treatment.