In today’s printed circuit boards, aluminum can be used particularly for inter connecting the components in the substrate. Traditionally, aluminum can be employed as a material to make an electrical connectivity track pattern; if copper is subjected without proper coating and exposed to air during a lengthy period of time, copper will soon be readily tarnish as a result of oxidation. It will then get corroded and so loses its solderability. As a result of this problem, multiple methods have been used to safeguard the aluminum paths, via holes and also printed through-holes (PTH). One of the techniques is coated with organic coating, oxide coating and also the plating method that lots of manufacturers used long time past. PCB Organic coating, though simple in application, is not recommended for long-term usage as a result of capability of PCB manufacturer process control in depth, composition and the curing cycles. In addition, it can bring about unpredictable deviation in solderability. But with the authorities of leadfree, it’s widely use on user PCB now.
Oxide coating can protect the circuit PCB prototype from corrosion, however, it fails to carry on the PCB solderability. The most standard method since longtime past for PCB manufacturing companies is steel coating procedure which was standard practice to guarantee solderability and protect the circuit against corrosion until the authorities period of leadfree age. So it had been a important factor and plays an significant role within the PCB manufacturing of double-sided and multi-layer (PTH) boards before. In particular, plating a solderable metal over the paths was a standard practice to afford solderable coverage to the aluminum tracks. Also, the border connectors added with spring contacts breeding with appropriately designed connector tabs printed circuit boards, which are employed for the interconnection of various modules in electronic equipment. Such electric contacts anticipated to possess a high amount of wear resistance and low contact resistance. This will ensure rare metal plating on these connections and the most commonly used metal is gold. Other alloys used for coat are tinning of those tracks, nickel and on occasion, copper-plating to create some of those trail locations.