Precautions for tin plating
(1) prevention of oxidation film
Strengthen solution maintenance. Prevent the invasion of harmful organic and inorganic impurities, reduce these impurities and tin co-deposition, so as to ensure the purity of tin coating, slow down the speed of tin discoloration.
(2) strengthen the post-treatment of plating. After plating, thoroughly wash with cold and hot water, try to clean the decomposition products of organic brightening agent adsorbed on the surface of the workpiece, and immediately dry.
Keep it sealed. After full drying, it should be stored in a sealed dryer immediately, thus effectively preventing the pollution of harmful gases in the atmosphere.
(2) clean and remove the coating after color change
Tap water in the infiltration of 2min. Small items to prevent paste.
(2) remove oxidation film in dilute hydrochloric acid:
Hydrochloric acid
30 ~ 50mL/L
The temperature
At room temperature
time
L0 ~ 15 s
Prevent small items from pasting.
(3) water rinse. Small items to prevent paste.
(4) and:
Sodium carbonate
5 to 10 grams per liter
The temperature
At room temperature
time
0. 5 to 1 min
Small items to prevent paste.
5. Running water washes. Small items to prevent paste.
6 deionized water rinse, small pieces to prevent paste.
All landowners blow dry.
Today drying:
The temperature
50 ~ 60 ℃
time
5 ~ lOmin
After drying, store in a sealed dryer.