Nickel-tungsten Alloy Plating Mold Analytic Process(a)

Insiders know that the quality of the parts is closely related to the quality of the mold. Many die (such as die casting) of the surface must be plated in order to improve the corrosion resistance, abrasion resistance, oxidation resistance and hardness properties. According to the HC surface network Xiaobian understand, despite the traditional chrome technology mature technology, stable quality, but because chromium is a toxic substance, serious environmental pollution. Therefore, the elimination of pollution, environmental protection, clean production, the path of sustainable development.

Nickel-tungsten alloy plating is to improve the quality of mold, to extend die life, a good choice for clean production. Nickel, tungsten high hardness, wear resistance, and molten matrix adhesion and high temperature. Fine crystalline nickel-tungsten alloy plating bright, good wear resistance, combined with the strong base, high hardness, Vickers hardness at elevated temperatures up to 1000 or more. The technology in recent years by the parties concerned, will gradually replace the mold chrome plating, however, according to HC Xiao Bian understood that the technology prevailing coating roughness, uneven, pitting and other defects, severely restricts their application development. Let Xiaobian for you to resolve mold electroless nickel-tungsten alloy process recipe and process.
    
Bath formulation and process
    
Bath mainly composed of sodium tungstate, nickel sulfate and sodium citrate, whose contents were 40 ~ 45gL, 20 ~ 30gL, 40 ~ 50gL.
    
Process:
    
Sandblasting → Check → Degreasing Cleaning → Plating → Test
    
Coating quality defects and causes
    
Common tungsten nickel plating quality defect is pitting more rough side and white spherical particle coating, coating and central side corners and R at serious inequality, and even the corners, R occurring at the micro cracks.




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