Electroplated gold finger
Advantage:
1. Can reduce the contact resistance of the contact
2. Beautiful appearance
Disadvantages:
1. The process requirements are high and the conditions are not easy to control.
2.The liquid used has toxic side effects and is not conducive to the operator.
3. Prone to surface oxidation, uneven color, pin point depression, gold surface scratching, etc.
Storage time and Conditions：
1.Vacuum packaging, storage in an acid-free and alkali-free environment and at room temperature (5 ° C - 30 ° C) humidity <60% for one year.
2. Repeated reflow conditions (140 ° C - 270 ° C, 8 minutes) can be repeated three times
Lead-free spray tin
Advantage:
1. Environmentally friendly surface treatment.
2. The work efficiency is high.
3. Small equipment investment
Disadvantages:
1. The melting point is high (tin-silver-copper alloy 217 ° C), the operating temperature is above 260 ° C, the equipment is easy to change.
2. During the process, the PCB is subjected to the high temperature impact of the tin spray, and the physical properties are easy to change.
3. The tin surface is not flat, the through hole is stuck in the tin, the hole is filled with tin, the tin is high pressure flat, the tin is oxidized, etc., and the SMT mounting is inconvenient.
Storage time and Conditions：
1. Vacuum packaging, normal temperature (5 °C-30 °C), humidity <60% can be stored for one year
2. Open vacuum packaging for three months without acid, alkali and low humidity (humidity <40%)
3. Repeated reflow conditions (140 ° C - 270 ° C, 8 minutes) can be repeated three times
