With the gradual development of short, small, light and thin electronic products, the advantages of flexible circuit boards are becoming more and more obvious, and the market demand is also increasing. Gold plating, tin plating, OSP, etc., then immersion gold and gold plating are both gold, what is the difference between them?
- What are the aliases of gold-plated and immersed gold?
- Gold plating: hard gold, electro gold
- Immersion Gold: Soft Gold, Chemical Gold
- The origin of the alias
- Gold plating: The gold particles are attached to the FPC board by electroplating. All of them are called electric gold. Because of their strong adhesion, they are also called hard gold. The gold fingers of the memory stick are hard gold, which is wear-resistant. With gold plating.
- Immersion gold: Through chemical reaction, gold particles crystallize and attach to the pads of the FPC board. Because of the weak adhesion, it is also called soft gold.
- The effect of gold plating and immersion gold on the Assembly
- Gold plating: Do it before solder masking. After doing it, the green oil may not be cleaned cleanly, and it is not easy to apply tin.
- Immersion gold: After solder mask, the patch is easy to be tinned.
- The process sequence is different
- Gold plating: This process is done before solder masking, because gold plating requires two electrodes, one is the FPC board and the other is the cylinder tank.
- Immersion gold: After the solder mask is made, the chemical method is the same as the immersion tin, and gold is attached to the place where there is a copper leak.
- Effects of gold plating and immersion gold on electrical appliances
- Gold plating: Before gold plating, a layer of nickel should be plated first, and then a layer of gold should be plated. The metal layer is copper-nickel-gold, because nickel is magnetic and has an effect on electromagnetic shielding.
- Immersion gold: Immersion gold directly on the copper skin, the metal layer is copper gold, no nickel, no magnetic shielding.
- Identification of gold plating and immersion gold
- Gold plating process Because FPC contains nickel, it is magnetic. When identifying gold plating or immersion gold, you can use a magnet to attract the FPC board. The attractive one is gold plating, and the unattractive one is immersion gold. In addition, the color is also different. Immersion gold is golden yellow. Because the gold surface is large, gold plating is generally thin and tends to be white. Of course, there are also thick plating, which is also golden yellow. At this time, it is difficult to distinguish the pads.
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