4 results about "Gunmetal" patented technology

This invention relates to the field of COF carrier technology, and more particularly to a COF carrier and its preparation method. The preparation method includes the following steps in sequence: coating, exposure, development, etching, micro-etching, first chemical tin plating, first baking, solder resist printing, second chemical tin plating, and second baking; wherein, the tin layer thickness of the first chemical tin plating is 0.05~0.08μm; the first baking makes the tin layer completely become a copper-tin alloy; solder resist printing uniformly prints a layer of ink on the non-lead area of ​​the carrier; and the second chemical tin plating is performed only on the lead area of ​​the carrier. This invention, by adjusting the production process and unfolding sequence of the COF carrier, and through the micro-etching process after desmearing and the second tin plating process, increases the copper content and reduces the amount of copper-tin alloy formed by the structural design of the COF carrier, thereby increasing the pure copper ratio of the circuit, improving the heat dissipation capacity of the COF carrier, and enhancing the packaging and testing efficiency of the COF carrier at the packaging and testing end.

This invention relates to the field of industrial waste resource utilization technology, specifically to a method for recycling copper-tin alloy-clad steel waste, comprising the following steps: placing the copper-tin alloy-clad steel waste into an ammonia leaching reactor for stirring and leaching to obtain leaching residue and leachate; washing the leaching residue to obtain iron and a cleaning solution; pumping the leachate and the cleaning solution together into a filter press for filter pressing to obtain filter residue and filter liquid; washing the filter residue to obtain tin mud; sending the filter liquid into an electrowinning copper tank to obtain copper and a copper-lean electrolyte; and pumping the copper-lean electrolyte back into the ammonia leaching reactor for subsequent copper-tin alloy-clad steel waste leaching processes. This invention's method for recycling copper-tin alloy-clad steel waste can separately recover metallic copper, tin, and residual iron from the copper-tin alloy-clad steel waste, achieving high recovery efficiency and low pollution.

The application discloses a kind of high-performance copper-based composite material for extreme environment and preparation method thereof, it is related to metal material technical field, the composite material includes: a) copper matrix, the copper matrix includes pure copper or copper alloy, copper alloy further includes copper-nickel, copper-beryllium, copper-zinc, copper-tin alloy;B) reinforcing phase material;C) one or more alloying elements;D) additive, the additive includes yttrium, lanthanum;In the technical scheme provided in the application, by adding appropriate amount of nickel, phosphorus, iron, manganese, cobalt, titanium, beryllium, zirconium and other alloying elements, the strength, toughness and wear resistance of the composite material are improved, so that the material can withstand greater stress without damage in extreme environment. Yttrium, lanthanum and other additives are used to optimize the microstructure of the material, and a dense protective layer is formed on the surface of the material through surface treatment technology, greatly improving the corrosion resistance of the material.

This invention discloses a rare earth modified trivalent chromium plating process and coating structure for magnesium alloys. The process includes sequentially preparing a chemical zinc plating layer, a cyanide-free copper plating layer, a cyanide-free copper-tin alloy plating layer, a bright nickel-copper alloy plating layer, a bright nickel-cobalt alloy plating layer, a rare earth modified trivalent chromium plating layer, and an anti-discoloration protective film on a magnesium alloy substrate. The rare earth-modified trivalent chromium plating process is as follows: 80-140 g / L chromium chloride hexahydrate, 90-160 g / L potassium chloride, 90-160 g / L ammonium chloride, 16-30 g / L ammonium bromide, 40-60 g / L ammonium formate, 45-65 g / L boric acid, 8-12 mL / L rare earth additives, 2-4 mL / L leveling agent, 1-3 mL / L accelerator, pH of the plating solution 2.5-3.2, plating tank temperature 25-35℃, cathode current density 8-16 A / dm², using an inert graphite rod as the anode, and moderate air agitation. The rare earth additives have a synergistic effect on improving the performance of the trivalent chromium plating solution. The plated parts undergo a neutral salt spray test for 140 hours according to GB / T 10125–2021, and no surface corrosion is observed.