source:Other information release time:2023-03-23 Hits: Popular:PCB Assembly company
In the circuit board of mobile phones and computers, there are gold and copper. Therefore, the recycling price of the waste circuit board can reach more than 30 yuan per kilogram. It is a lot more expensive than selling waste paper, glass bottle, and scrap iron.
From the outside, there are three main colors of the outer layer of the circuit board: gold, silver, and light red. Gold is the most expensive, the silver is cheap, and the lighter red is the cheapest.
It can be seen from the color that the hardware manufacturers have tacitors to reduce materials. In addition, the line inside the circuit board is mainly pure copper. If it is exposed to the air, it is easy to be oxidized. The outer layer must have the above protective layer. Some people say that golden is copper, which is wrong.
Large area of gold plating on the circuit board
Gold is the most expensive and real gold. Although there is only a thin layer, it also accounts for nearly 10%of the cost of circuit board. In some places in Guangdong and Fujian, there are some places to acquire waste circuit boards to peel off the gold, and the profits are considerable.
The reason for using gold has two purposes, one is to facilitate welding, and the other is to prevent corrosion.
The golden finger of the memory bar 8 years ago is still glittering. If copper, aluminum, and iron are replaced, it will not be used for long rust.
The gold -plated layer is widely used in the component pads, gold fingers, and connectors of the circuit board.
If you find that some circuit boards are all silver, it must be cut off. Industry term is called "Costdown".
Most of the mobile phone motherboards are gold -plated boards. Computer motherboards, audio and small -digital circuit boards are generally not gold -plated boards.
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