一, Product descripion: LT-450 has excellent follow-bit performance, providing uniform and meticulous color-pure tin plating, a single-agent system enables more convenient operation, a very wide scope of the operation remained stable, LT-450 is non-fluoride.
二, The operating conditions :
The scope of the standard
Sulfuric acid tin 25-40 grams / liter and 30 grams / liter
Sulfate 8-12% 10%
LT-450 30-50 ml / liter and 40 ml / liter
The temperature 18-28 ° C 23 ° C
The cathode current density of 5-30ASF 15ASF
Anode 99.9% pure tin, Mongolia rain is linked alloy or stainless steel anode bags and P.P
Morale can not be used
A continuous filtration filter micron filter P.P
Swinging cathode level swing
Voltage 0.5-3V
三, Bath maintenance :
1, liter LT-450 can be used 2,000 ampere hours;
2,15 ASF current density at the deposition rate of 6 microns / 10 minutes;
3, the two maintain price analysis tin ion, sulfate content within the permissible range;
4, the system Bath temperature <28 ° C, can be optimized using constant temperature;
5, into the air to avoid entering the bath to prevent the price of tin ion oxidation;
6, try to avoid copper ions into the bath, bath of copper ion 0.5-Current 2ASF to disarm.
四, Analytical methods :
(1) of stannous sulfate Determination : An accurate to measure 5 ml of Bath, into 250 ml conical bottle, by adding 50 ml of deionized water and 10 ml 1:1 and 1 ml HCl 1% starch indicator evenly mixed, with 0.1N standard solution of iodine titration to blue (30 seconds not faded ) shall finish;
(2)Two methods of calculation : stannous sulfate (g / L) = iodine equivalent × × 21.48 Titration
(3)the control of client-40 (g / L)
(4)sulfate Determination : One, from 5 ml of Bath, into 250 ml conical bottle, by adding 50 ml of deionized water and 50 ml of 4% COONH4 plus three drops of methyl red indicator. After mixed evenly with 1 mol / L-titration solution to disappear namely red end;
(5)Two methods of calculation : sulfate content (g / L) = sodium hydroxide equivalent × 9.8 × Titration
Sulfuric acid content (mg / L) = sodium hydroxide equivalent Titration × 9.8 × ÷ 1.84
(6)the control :180-210 (g / L) 90-100 (mg / L)
