High-brightness high-corrosion-resistance high-wear resistance nano compound electroplating layer composition
A nano-composite, electroplating technology, applied in coatings, electrolytic coatings, etc., can solve the problems of extinction, corrosion resistance, brittle coating, etc., to reduce production costs, improve corrosion resistance, and be easily popularized. Effect
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Embodiment 1
[0023] Embodiment 1: plate dark nickel 1.5 μm with standard Watt electrolytic solution, then electroplate composite nickel by following process formula and condition: nickel sulfate (NiSO 4 ·6H 2 O) 350g / L, boric acid 40g / L, sodium chloride 15g / L, α-Al 2 o 3 Composite nano slurry (primary grain size of nanoparticles is 65nm) 120g / L (solid), PH4.0, Dk3.5A / dm 2 t°C 60, electroplating composite nickel coating 7μm, nickel sulfate 350g / l, then electroplating bright nickel layer 4μm according to the conventional bright nickel process specification, and finally chromium plating 0.25μm, the obtained coating was evaluated by 24hCASS test. The corrosion resistance level is 9 / 8, and the defect area 0.07%, wear rate 0.003%, micro Vickers hardness value (HV0.1) 597.
Embodiment 2
[0024] Embodiment 2: test process is identical with example 1, wherein α-Al 2 o 3 The content of the composite nano-slurry (primary grain size of nano-particles is 65nm) is 80g / L (solid), and the obtained coating is evaluated as 9 / 8 by the 24hCASS test for corrosion resistance, with a defect area of 0.08%, wear rate of 0.006%, and micro-Vickers hardness Value (HV0.1) 596, its corrosion resistance and hardness almost unchanged, only a slight increase in wear rate.
[0025] Comparative experiment: According to the conventional high corrosion resistance three-layer nickel process (dark nickel / semi-bright nickel / high sulfur nickel / bright nickel), the total thickness of the coating is 25 μm, and then a 0.25 μm chromium layer is plated. The obtained coating is evaluated by 24hCASS test. The corrosion grade is 7 / 6, the defect area is 0.3%, the wear rate is 0.65%, and the micro Vickers hardness value (HV0.1) is 462, its corrosion resistance and hardness are much lower than the comp...
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