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Patent

Electroless ni-w-p alloy plating solution and the method for plating using the same

Ko Taek Ryong
TLDR
In this paper, an electroless nickel-tungsten-phosphorus alloy plating solution and a plating method using the same are provided to prevent the discoloration or stain of a film plated on the surface of a metal.
Abstract: 
PURPOSE: An electroless nickel-tungsten-phosphorus alloy plating solution and a plating method using the same are provided to prevent the discoloration or stain of a film plated on the surface of a metal, thereby stably maintaining the plated condition of the film. CONSTITUTION: An electroless nickel-tungsten-phosphorus alloy plating solution includes 30 to 50 g/Lt of a nickel sulfate hexahydrate (NiSO46H2O) as metallic salt, 50 to 100 g/Lt of a tungsten alloy source selected from a group of a sodium tungstate dihydrate (Na2WO42H2O), a tungsten oxide, a tungsten chloride, and a carbonyl chloride tungsten, 30 to 50 g/Lt of a sodium hypophosphite (NaH2PO2H2O) as a reducing agent, and a complex agent selected from a group of 50 to 100 g/Lt of a sodium citrate (Na3C6H5O7H2O) and 100 to 130 g/Lt of an ammonium sulfate ((Na4)2SO4), a group of 50 to 100 g/Lt of the sodium citrate, 100 to 130 g/Lt of the ammonium sulfate, and 30 to 50 g/Lt of a glycine (HNCHCOOH), and a group of 50 to 100 g/Lt of the sodium citrate and 150 to 230 g/Lt of an ammonium citrate ((Na4)2HC6H5O7). [Reference numerals] (AA) Degreasing; (BB) Etching; (CC) Neutraliation; (DD) First zincate; (EE) Zincate separation; (FF) Second zincate; (GG) Electroless plating; (HH) Pure washing; (II) Drying

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Patent

Nano-sized-WC-strengthened Ni-W-P composite coating and plating process thereof

Luo Hong, +2 more
TL;DR: In this paper, the nano-sized-WC-strengthened Ni-W-P composite coating and a plating process of nano-size WC-based composite coating are described, and a sample obtained after oil removal, rust removal and activating treatment are conducted are conducted.
Patent

Method for tungsten alloy plating with and product plated with tungsten alloy

Lee Gi Jang
TL;DR: In this paper, a tungsten alloy plating method and a product plated with a tengsten alloy was described. But the method was not described. And the product was not obtained by the method.
Patent

Tungsten-nickel-molybdenum alloy electroless plating solution and plating method using the same

Kim Dae Soo
TL;DR: In this article, a tungsten-nickel-molybdenum alloy electroless plating solution and a plating method using the same was presented, which can form excellent plating having enhanced acid resistance, corrosion resistance, chemical resistance, hardness, adhesion, and abrasion resistance.
Patent

Method for preparing nickel-tungsten-phosphorus alloy plating on rail copper strip surface and electroplating solution therefor

Cong Hao, +2 more
TL;DR: In this paper, an ultrasonic electroless plating method was adopted to plate the rail copper strip surface with a nickel-tungsten-phosphorus alloy to prepare a composite NPH-alloy plating.