The production of PCB goes through a lot of complex processes, and surface treatment is one of them. The PCB surface treatment includes many ways, including: Hot air smoothing (which is also known as hot air solder smoothing, referred to as HASL), lead-free hot air smoothing (LF HASL), gold plating, organic coating (also known as organic solderability preservatives, referred to as OSP), immersion silver, immersion tin, immersion nickel gold (also known as Electroless Nickel/Immersion Gold, referred to as immersion gold, ENIG), chemical nickel palladium gold, electroplated hard gold, etc. Among them, immersion gold is a very common process.
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