Identify PCB surface treatment process by color from aaronking's blog

The surface of the circuit board usually has three colors: gold, silver, and light red. Gold is the most expensive, silver is cheaper, and light red is the cheapest. So, how to identify the PCB surface treatment process by color? Next, Shenzhen PCB board manufacturing pcb manufacturer will introduce it to you.

Identify PCB surface treatment process by color
1.gold
Gold is real gold. Although it is only a thin layer, it accounts for nearly 10% of the cost of the circuit board. The purpose of using gold is firstly to facilitate welding and secondly to prevent corrosion. The gold plating layer is widely used in component pads, gold fingers, connector shrapnel, etc. of circuit boards.

2. Silver
The silver circuit board is called a spray tin board. Spray a layer of tin on the outer layer of the copper circuit to help with soldering. Spray tin plate has no effect on the components that have been soldered, but the reliability is not enough for the pads that have been exposed to the air for a long time. It is easy to oxidize and rust after long-term use, resulting in poor contact.

3. Light red
OSP, organic soldering film, is an organic substance rather than a metal. It is cheaper than the tin spray process. Its only function is to ensure that the inner copper foil will not be oxidized before welding. When welding is heated, this film evaporates. OSP can weld copper wires and components together during soldering, but it is not corrosion-resistant. If an OSP circuit board is exposed to the air for more than ten days, components cannot be soldered.

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