45 results about "Electroless coating" patented technology

Process for roughening a surface of a base metal substrate includes contacting the surface with an aqueous solution comprising oxalic acid, sulfuric acid, and hydrogen peroxide at a temperature and for a period of time effective to roughen the surface to an average roughness greater than 60 Ra, removing a modest amount of base material, and generating no narrow and deep crevices at all. The surface is roughened prior to application of an electroless coating onto the substrate.

A silicone coating for electroplating, comprising: a hydroxyl-terminated polyorganosiloxane, a reinforcing filler, a crosslinking agent, and a catalyst, wherein a diluent is added to the silicone coating, and the diluent is a volatile organic Solvent; based on 100 parts by weight of hydroxyl-terminated polyorganosiloxane, the content of the above components is: reinforcing filler: 0-100 parts by weight; crosslinking agent: 0.5-20 parts by weight; catalyst: 0.05-10 parts by weight parts by weight; diluent: 100-300 parts by weight. The present invention also relates to a preparation method of the above-mentioned organosilicon paint, and using the organosilicon paint as a protective coating for electroplating. The organosilicon coating provided by the invention has excellent storage and operability. By adding a diluent to the system, it can be operated for more than 4 hours before coating, and the curing time of the coating after coating is 10 to 15 minutes. It is suitable for use in electroplating. The non-plated areas are coated.

A new electroless plating approach to generate a porous metallic coating is described in which a metal is electrolessly deposited on a surface. Microparticles in the metal are removed to leave pores in the metal coating. Another method of forming electroless coatings is described in which a blocking ligand is attached to the surface, followed by a second coating step. The invention includes coatings and coated apparatus formed by methods of the invention. The invention also includes catalyst structures comprising a dense substrate and a porous metal adhered to the dense substrate, which is further characterized by one or more of the specified features.

A work piece is mixed with Ni pieces having an average diameter of 1 mm and exhibiting catalytic activity to oxidation reaction of sodium phosphinate (NaH2PO2) added as a reducing agent in a plating bath containing the reducing agent and a Ni salt to form a Ni-P film on an electrode made of Cu, Ag or Ag-Pd by auto-catalytic electroless plating. Then, the work piece is dipped in a plating bath containing an Au salt to form an Au film on the surface of the Ni-P film by substitutional electroless plating. This method is capable of forming a desired plating film only on a desired portion at a low cost.

A multilayer metal-matrix composite that includes a metal core sheet and a plurality of side sheets is disclosed in which the metal core sheet is reinforced with a reinforcement material selected from the group consisting of ceramic reinforcements. The reinforced metal core sheet is coated with an electroless coating. A method of fabricating a multilayer metal-matrix composite with reinforced particles and a coating using a combination of electroless coating method and accumulative roll bonding method is further described in this disclosure with the aim of reducing the number of required accumulative roll bonding cycles to obtain improved or desired properties.

The invention provides components for compressors having electroless coatings on wear surfaces. Carbon dioxide compressors having one or more coatings with wear surfaces having electroless surface coatings are provided. Alternatively, propane compressors are contemplated having wear surface coatings. The coating is electrolessly applied and may comprise nickel and wear resistant particles, such as boron nitride. The electroless surface coatings for use with compressor machines improve corrosion and wear resistance, as well as anti-friction properties for compressors processing CO2 or C3H8 containing refrigerants. In certain aspects, a scroll machine has an Oldham coupling and/or lower bearing comprising aluminum and has an electroless surface coating comprising nickel boron nitride particles disposed on one or more wear surfaces. In other aspects, a reciprocating compressor has a wear surface, such as on a connecting rod and/or piston coated with an electrolessly applied nickel and boron nitride particle layer. Methods for making the electroless surface coatings are also provided.

The saw and cutting blades of this invention have an electroless nickel boron coating applied from a bath containing metal stabilizers. The metal stabilizer is usually introduced into the coating from an electroless coating bath and is co-deposited into the coating. The source of the metal stabilizer is usually a metal compound or salt that is used to stabilize the nickel boron bath.

A semiconductor die includes a metal layer deposited thereon for enhancing adhesion between the die and a mold compound package. The metal layer is substantially oxide free. The die is coated with a layer or layers of copper (Cu) and/or palladium (Pd) by electroplating or electroless coating techniques. The metal layer provides a uniform wetting surface for better adhesion of the die with the mold compound package during encapsulation. The increased adhesion reduces the delamination potential of the die from the package.

Materials, methods and kits are disclosed for providing an electrolessly-deposited tarnish-resistant silver-tungsten coated object, the electrolessly-deposited tarnish-resistant silver-tungsten coated object comprising: an object; a silver-tungsten coating on the object, wherein the silver-tungsten coating has a substantially constant reflectivity of more than 90% at 500 nm after exposure of the coated object to ambient air for a time period of at least one week.

The invention relates to the technical field of surface treatment, in particular to a surface treatment process of an HDI plate based on a chemical nickel-gold plating coating, and the surface treatment process comprises the steps of clamping, washing, drying and polishing a plate, a washing tank is arranged in a treatment box, and the surface of the HDI plate is washed by using a pickling solution, so that the surface of the HDI plate is subjected to micro-etching; the method comprises the following steps: removing rust scale, an oxidation film and other rust on the metal surface of a pre-plated printed circuit board, activating the metal surface of an HDI plate, adding chemical plating accelerators with different functions into a pickling solution, sufficiently adsorbing the accelerators on the inner walls of blind holes and through holes of the HDI plate before chemical plating, feeding the HDI plate into a chemical plating tank, and carrying out chemical plating on the inner walls of the blind holes and the through holes of the HDI plate after the HDI plate is fed into the chemical plating tank. As the concentration of the accelerator adsorbed in the blind hole is higher than that of the accelerator adsorbed on the plate surface, the growth speed of the chemical plating layer is obviously higher than that of the plate surface, so that a good metal plating layer is obtained, and the generation efficiency of the surface coating of the HDI plate can be effectively improved.