一.Product description : LT-385 copper corrosion or liquid ammonia low, low lateral erosion Zhi corroded copper or alkaline solution is to fine lines printed circuit board manufacture and design of a special liquid, used in high-precision plate inner and outer plate corrosion of copper, its preferred stability and Drugs, could apply to contain the preapplied all anti-layer etch resistance. Due to the good quality control under the long-term product and the relative stability of low priced, LT-385 in the general market has become more and more attention and welcome.
二.Product characteristics :
1, the lateral erosion low, applicable to high precision inner and outer plate etching plate.
2, low pH, applicable to the trunk and elsewhere in anti-layer etch resistance.
3, with the proportion of pH and add automation system.
4, good stability, precipitation, easy to maintain.
5, adjustable stability and high corrosion rate of copper.
6, the high volume of copper.
7, washed is excellent.
三. (1) inner-liquid specifications :
Color : transparent clarification
OH-: 3.1 ± 0.5N
Chloride content : 155 ± 20 g / L
Weight : 1.058 ± 0.020 @ 25 º C
Storage temperature : 10-35 ° C, ventilation environment
Inner-liquid preparation :
LT-385 Salt : 500GB / L
Ammonia (20%) : 300 ml / L
Water : cushion
(Ii) the outer liquid-specifications :
Color : transparent clarification
OH-: 4.2 ± 0.3N
Chloride content : 165 ± 20 g / L
Weight : 1.06 ± 0.020 @ 25 º C
Storage temperature : 10-35 ° C, ventilation environment
Outer-liquid preparation :
Scope optimal conditions
LT-385 Salt : 270g/L-300g/L 300g / L
Ammonia (20%) : 300ml/L-400ml/L 360ml / L
Water : cushion
四. The operating conditions :
(1) inner operating conditions :
Scope optimal conditions
Chloride content : 150-190g / L 170 g / L
Copper contents : 120-reductant sodium / 140g L / L
PH : 8.0-8.6 8.2
Weight : 1.170-1.190 1.180
Temperature : 44-50 º C 48 º C
(Ii) the outer operating conditions :
Scope optimal conditions
Chloride content : 150-190g / L 170 g / L
Copper contents : 115-customized / 125g L / L
PH : 8.0-8.8 8.5
Weight : 1.170-1.190 1.180
Temperature : 44-50 º C 48 º C
Zhi copper corrosion rate : (depending on equipment and the temperature varies) 2.0-2.6mil/min continuous operation with PH and cooling system, add weight control system.
五.Quipment :
Structure : engineering plastics, stainless steel.
Heater : quartz heating pipe, titanium heat pipe.
Tube : titanium tube, plastic cooling coil.
Ventilation : I suggest using the amount of wind 100-500CFM air and the installation of pipelines to transfer air volume bumpers.
Electrical : all electrical devices should be sealed to prevent corrosion.
六. Built trough formula :
1, water corrosion of copper for washing machines and renewable clean water replacement after the re-commencement of water injection and the next cycle of nozzle to clean emissions after 10 minutes.
2, 5-10% HCL injection spray and the opening cycle, sprayed 30 minutes after washing emissions.
3, Shimizu Repeat steps 2, and check all the pipes are not leaking.
4, unload all nozzle immersed in 10% HCL nozzle inspection and have failed to plug, plug if it is necessary to clear up so that plug-flow nozzle.
5, and put back all the nozzle.
6, ammonia injection of 5% (volume ratio) and opened spray cycle, sprayed 30 minutes after washing emissions.
7 to water Repeat steps 6.
8, into LT-385 liquor, opened temperature controller, check ingredients (PH, the proportion of CL-content, Cu2 +) in the correct range can be produced.
七. Bath analysis methods :
1,copper (Cu2 +) Analysis :
A, in a 100ml bottle capacity by adding 10ml Bath, plus 2-3ml ammonia, diluted with water to the mark (A solution);
B, take 10mlA Add 250ml liquid iodine bottle, plus 30ml water;
C, 5-6ml30% H2SO4 (from Chunlan colors of green, but not deep);
D, plus 10ml20% of the potassium iodide, shaking to release the dark after 10 minutes, this time for brown;
E, 0.1 (N) Na2SO3 standard solution by titration to lighter brown;
F, 2% starch indicator 3ml, this time to blue, blue to titration to disappear;
G calculation : Cu2 + (g / L) = 63.54 × (V.C) Na2SO3
H, control :120-160 (g / L)
2, chlorine ions (CL-) Analysis :
A intake in 250ml liquid 3mlA conical bottle, plus 50ml water;
B, plus 2 ml sodium, then dropping 10% acetic acid solution until the solids (this solution should be yellow);
C, 0.1 (N) AgNO3 standard solution by titration of the yellow light brown (the actual color change very significantly, see precipitation so far into light brown);
D, calculation : CL-(M)=3.3.3× (V.C) AgNO3
E, the control :4.8-5 .8 (M)
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