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The most basic purpose of PCB surface treatment is to ensure good solderability or electrical properties. Since natural copper tends to exist in the form of oxides in the air, it is unlikely to remain as original copper for a long time, so other treatments are needed for copper.1. Hot air leveling (spray tin)Hot air leveling is also known as hot air solder leveling (commonly known as tin spraying). It is a process of coating…查看更多