... During storage, the diffusion of copper in the tin surface continues, causing the thickness of the pure copper or tin layers to decrease. If | MULTILAYER BOARDS ONLINE | the blended metal reaches the surface it becomes coated with a non- removable oxide, making soldering impossible. Storage possibilities of immersion tin PCBs are, for | MULTILAYER BOARDS ONLINE | this reason, considerably limited compared with conventional SnPb techniques: stored PCBs should be used up within 3 months and if time exceeds 6 months, heavy | MULTILAYER BOARDS ONLINE | processing problems can occur. The price of immersion tin is between that of the classical SnPb and the immersion nickel gold surfaces. However, thiourea, which | MULTILAYER BOARDS ONLINE | is used in the production, does not conform with environmental or effluent requirements, therefore the future costs for disposing of wastes are difficult to calculate, | MULTILAYER BOARDS ONLINE | particularly in view of the upcoming, stricter environmental regulations. Conclusion Immersion tin can be seen as a viable alternative, as the surface offers many advantages | MULTILAYER BOARDS ONLINE | under the conditions ...
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... REFINED: THE IMMERSION NICKEL GOLD PCBS APPLICATION AREAS Immersion nickel gold process has long been an established surface refining process among printed circuit board | MULTILAYER BOARDS ONLINE | techniques. However, in spite of many advantages over conventional solder levelling it has only been adopted for certain application areas. Nickel gold is utilized in | MULTILAYER BOARDS ONLINE | particular where PCB surfaces are exposed to aggressive environments, for instance in mobile phones, or automobile electronics. Due to the consistent chemical precipitation of metal, | MULTILAYER BOARDS ONLINE | gold is the obvious choice for all fine-pitch assemblings with under 0,5 mm grid spaces. Due to its smooth excellence, the immersion nickel gold surface | MULTILAYER BOARDS ONLINE | is a better alternative to HAL, particularly for narrow SMD grids on both side of PCB`s. The actual wiring of a component is effected by | MULTILAYER BOARDS ONLINE | means of a 4-6 my thick layer of nickel, and not by means of the extremely fine 0,05 to 0,2 my layer of gold which | MULTILAYER BOARDS ONLINE | merely serves as an oxidation and diffusion blockage in order to ...
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