Bright electroless nickel plating additive

1. Process characteristics: Bright Nickel Plating additive long cycle life, up to 8-10 cycles (Metal Turn Over), [meaning cycle per liter of nickel plating bath will be fully applied to the nickel content is supplemented when opening cylinder called a cycle, a cycle can be deposited coatings least 900dm2 · μm]; maximum deposition rate of up to 20-22μm / h; throwing ability, all plating capability strong, fully meet the "profiling effect"; high hardness, corrosion resistance ability; coating low porosity, 10μm pore-free; good wear resistance, better than chrome plating; good weldability, can be solder wetting; good electromagnetic shielding performance, can be used in electronic components and computer hard drives; coating non- crystalline, non-magnetic Ni-P alloy 2. Coating characteristics: phosphorus content: 6-9% (wt); ????????????????????? Resistivity: 60 -75μΩ · cm; density: 7.6-7.9g / cm3; ??????????????????????? Melting point: 860-880 ℃; Hardness: plated: Hv 500-550 (45-48RCH); binding force: there is far higher than 400MPa steel plating; after heat treatment: Hv1000; internal ??????????? stress: stress within the steel is less than 7MPa 3. Plating solution composition and operating conditions: raw material and operating unit range - bright nickel plating additive A% (v / v) 5 bright electroless nickel plating additive B% (v / v) 15 pH 4.6-4.8 temperature ℃ 85-90 (87) loading amount dm2 / L 0.5-2.5 (1.5) times depending on thickness depending on thickness 4. Preparation of the solution: when open cylinder, the water tank was charged with a solution of 1/2 that. Added 5% of A and 15% B, mechanical stir, with filter device. Purified water was added to the desired approximate volume. Heated to 88 ℃. Adjusted with ammonia or sulfuric acid to pH 4.6-4.8 water to the mark to plating according to process requirements. 5. equipment needs project requirements tank PP, PVC or PE high density rack PP, PVC or 316 stainless steel. Ensure that the workpiece vertically in the bath, the minimum spacing between two adjacent panels are 10mm air mixing primary and secondary grooves have a moderate, uniform stirring pep 3-4 cycles per hour cycle system needs to add a feed pump made of PVC, PP or PE, alkali resistant filtration system continuously loop filter with 10μm filter wick or filter bag ventilation heating system needs to be analyzed 6. bath and additional working fluid Ni2 + standard concentration of 6.0 g / l, analysis Ni2 + concentration Methods: pipette 5ml work was placed in a 250ml Erlenmeyer flask, 50ml of deionized water, then add 10ml of aqueous ammonia (28%), shaken, added 0.2 g murexide indicator, shake, titration with EDTA standard solution of 0.05M and finish as a light brown to light purple. Whichever amount is calculated with EDTA supplemented calculated as: 10ml × 1g × (6- measured nickel content) × V