一. Product description : LT - 304 half-nickel dedicated to the printed circuit board or the general line play full-shiny nickel plating nickel project, with a very low stress, and the operation is a wide range of current density, which is applicable to nickel sulfate bath.
二.Bath Composition :
The optimum value range
Nickel ion 60-90 grams / liter and 75 grams / liter
Nickel sulfate 240-380 grams / liter 280 grams / liter
Nickel chloride 20-50 grams / liter and 30 grams / liter
Boric acid 30-50 grams / liter and 40 grams / liter
LT - 304 15-30 ml / liter and 20 ml / liter
三. The operating conditions :
40-50 ° C temperature 50 ° C
3.8-4.5 pH 4.0
Current density 0.5-6 amp / 2 inch square kilometers amp / square decimeter
Positive area ratio 1:2
Mixing swing, filtration cycle, clean and oil-free air mixing
Quartz heaters, stainless steel or 10.25
四.Analytical methods : 1. Nickel metal
1) draw a working fluid ml;
2) Using water diluted to 100 ml;
3) adding 5 ml PH = 10 buffer;
4) Add a small amount of murexide indicator (about 0.1 grams);
5) with 0.1M EDTA titration - to-end, color from yellow-green to purple;
五.Calculate : (grams / liter), the total nickel metal x = 5.871 ml of solution volume 0.1MEDTA
Reagent preparation : PH = 10 buffer : 70 grams from ammonia chloride dissolved in 570 ml of ammonia (0.9 share), plus Water
Dilution to a liter.
Murexide indicator : from 0.5 grams and 10 grams of murexide sodium chloride mixture.
六. Nickel chloride and nickel sulfate
1) draw 5 ml fluid;
2) adding 50 ml of pure water;
3) adding 3 ml of 10% potassium chromate solution;
4) using 0.1N silver nitrate titration end to brown;
七.Calculation :
nickel chloride (grams / liter) = 2.377 × 0.1N silver nitrate titration volume (ml)
Nickel metal (equivalent to nickel chloride NiCl2.6H2O aquifer) grams / liter = 0.247 × nickel chloride (grams / liter)
Nickel sulfate (NiSO4.7H2O) grams / liter = 4.784 × [total nickel metal (grams / liter) - Nickel Metal (g / liter) <P> 3.
1) draw 2 ml of working solution;
2) adding 25 ml (indicator);
3) titration using 0.1N sodium hydroxide solution from the green into purple reached the end;
八.Calculation :
boric acid (grams / liter) = 3.09 × 0.1N sodium hydroxide titration volume (ml)
Indicator of preparation : from 60 grams dissolved in a small amount of sodium citrate water, add 600 ml of glycerol; Alternative 2 grams
Phenolphthalein dissolved in a small amount of ethanol, the inclusion of such a solution, diluted with water to a liter.
