The surface treatment processes for PCB boards include various methods such as tin spraying, lead-free tin spraying, enig, and hard gold plating, all of which aim to achieve low cost, good weldability, harsh storage conditions, short time, environmentally friendly process, good welding, and flatness. Gold finger plates require patterning gold or ENIG processes due to their antioxidation properties and high conductivity, with ENIG being the more popular choice due to its better weldability, control of stress, resistance to oxidation, and better flatness.