One, degreasing (temperature 60 - 65 DEG C)
1. bubble: a bubble caused by the abnormal quality that can cause oil removal effect is poor, the bath caused by mismatched reasons.
2. there are particles of material composition: there are particles of material composition: filter bad or grinding machine pressure, insufficient water washing, the outside bring dust.
3. finger print oil off: finger printing oil removal off reason: in addition to oil temperature at the end of the wrong medicine.
Two, micro corrosion (NPS 80 - 120G/L, H2SO4 5%, temperature 25 - 35 degrees Celsius)
1. board copper surface is slightly white: the reason is grinding plate, oil or pollution, liquid concentration is low.
2. board copper surface is black: after degreasing, water is not clean, subject to oil pollution. Copper surface is pink, it is micro etching normal effect.
Three, activation (bath color is black, the temperature can not be more than 38 degrees, can not inflate)
1. tank solution precipitation and clarification:
The precipitating reason of bath liquid:
(1) with the addition of water, the concentration of palladium changed immediately, and the bottom of the content (normal plus liquid level applied pre infusion)
(2) low concentration of Sn2+, low content of Cl- and too high temperature.
(3) the introduction of air is too good to lead to palladium oxidation.
(4) contaminated by Fe+.
2. the surface of the water appears a layer of silver white film:
A film of silvery white material appears on the surface of the syrup because of the oxide produced by Pd oxidation.
Four, quick (treatment time 1 - 2 minutes, temperature 60 - 65 degrees Celsius)
1. hole copper free: Reason: accelerated processing time is too long, in the removal of Sn at the same time, Pd is also removed.
2. high temperature, Pd easy to fall off.
Five 、 chemical copper cylinder liquid contamination
Cause of contamination of liquid medicine:
1. PTH before each wash is insufficient.
2. Pd water into the copper cylinder.
3. there is a board drop cylinder.
4. long term no fried cylinder.
5. lack of filtration.
Tank washing: soak in 10%H2SO4 for 4 hours, then 10%NAOH and rinse with water at last.
Six, the hole wall sink copper
Reason：
1. degreasing effect is poor.
2. lack of glue residue.
3. excessive removal of slag.
Seven, copper and hole wall separation after thermal shock
Reason：
1. remove the bad slag.
2. substrate has poor water absorption performance.
Eight, a strip of water surface
Reason：
1. rack design with science.
2. heavy copper cylinder stirred too much.
3. the water is not enough after the acceleration.
Nine, The temperature of copper solution
The temperature is too high, which will lead to the rapid decomposition of copper solution, change the composition of the solution, and affect the quality of electroless copper plating. High temperature also produces a large number of copper powder, resulting in surface and hole copper particles. The general control is between 25 and 35 degrees celsius.