Environmental protection chemical nickel LQ-N001
LQ-N001 Environmental protection chemical nickel
LQ-N001 ultra bright full environmental protection electroless nickel plating does not contain chromium, mercury, lead, cadmium and other heavy metal components, suitable for Europe, America, Japan and other countries environmental requirements, with high plating speed, long cycle life, deep plating ability and dispersion ability is excellent, bright coating appearance and other characteristics.
Process characteristics:
solution has good stability and can be recycled, with a service life of 8-10 cycles (1 cycle means that all nickel is plated out and added to the original nickel content per liter of plating solution); The accumulated coating can be deposited more than 1250µm/dm 2 per liter of plating solution.
Fast deposition speed of 18-26µm/hr, which improves production efficiency;coating corrosion resistance is high; has excellent anti-impurity ability to solution; low porosity of coating;simple operation, easy to use;excellent wear resistance, heat treatment coating hardness can reach 1050VHN.
Product properties:
Phosphorus content: 6-9% (wt)、Microstructure: Amorphous Ni-P alloy, non-magnetic、Melting point: 870℃ or so、Hardness: coating: 450-550VHN、After heat treatment: 950-1050VHN、Binding force: steel or aluminum bonding strength above 400Mpa, much higher than electroplating nickel, chromium、Internal stress: the internal stress on steel is less than 7Mpa、Resistivity: about 75µΩ/cm、Corrosion resistance: 6-8µm thick coating can pass 5% sodium chloride 24 hours 9 grade continuous salt spray test.
Grooving and operating conditions:
| argument | Control range |
| Slotting agent: LQ-N001A | 6% |
| Slotting agent: LQ-N001B | 15% |
| PH value | 4.6-5.2(Adjusted with 50%NH3·H2O） |
| temperature | 90-96℃ |
| Working capacity | 0.5-2.5dm2/L |
| stir | Filtered air agitation |
Note: The conductivity of deionized water should be required to be ≤5µs/cm PH 5-8
Bath supplement:
1、The standard content of nickel in the working liquid is 6.0g/l(Ni). After chemical analysis of Ni2+ content, the content of Ni in the plating solution is reduced by 1g/l, then each liter of working liquid is added as follows。
Supplement: LQ-N001A 10ml/L
Supplement: LQ-N001C 10ml/L
According to the analysis of the specific dosage of Ni content is as follows:
| Ni analysis quantity | LQ-N001A Supplementary dose | LQ-N001C Supplementary dose | |
| Ni activity % | Ni2+（g/L） | (ml/L) | (ml/L) |
| 100 | 6.0 | 0 | 0 |
| 95 | 5.7 | 3 | 3 |
| 90 | 5.4 | 6 | 6 |
| 85 | 5.1 | 9 | 9 |
| 80 | 4.8 | 12 | 12 |
| 75 | 4.5 | 15 | 15 |
| 70 | 4.2 | 18 | 18 |
Analysis method of Ni2+ concentration in the plating solution:
(1) Take 10ml plating solution into 250ml conical bottle with pipette and add 100ml deionization water;
(2) Add 10ml of concentrated ammonia water to the conical bottle, shake the spoon;
(3) Add 0.02g ammonium purpurate indicator and continue to shake the spoon;
(4) Titrate with 0.1MEDTA standard solution until brown turns purple as the end point.
Ni content (g/l)= titrating milliliters ×0.587
Solution maintenance:
1、PH value: During the working process of the plating solution, the PH value tends to decrease, and the PH value is maintained at 4.6-5.2
Make the solution more stable. The PH value should be measured at a good solution stirring and operating temperature. Increase PH
The value is adjusted with dilute ammonia (reagent grade); 10% (V/V) dilute sulfuric acid for PH reduction (reagent grade)
Adjust.
2、Temperature: Faster electroless plating speed can be obtained at higher temperature. When thicker electroless plating is required
Nickel layer, should be used at a lower temperature to avoid the appearance of pinholes; When the solution is not in use, it does not have to be maintained positive
Constant operating temperature to prevent decomposition of reducing agent and stabilizer in solution. The optimum operating temperature is
90 ° C.
3、Mixing: Continuous filtration is recommended. For a smooth coating, a 5µm filtration system should be used
System, preferably with gravity deposit bag device; Without continuous filtration, after the solution has cooled,
That is, after the work is completed, a 3µm filtration system is used to filter and clean the solution before the second work can be carried out
Do. Even with a filtration system, the plating tank, filter and heater still require 30% nitric acid on a regular basis
Solution soaking to remove nickel residue, then washing with water, and finally cleaning with deionized or distilled water (may
Add a small amount of ammonia to deionized water).
