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Immersion Silver
At Bac Ninh Chemicals, we offer silver plating services, carried out on our manual production line. The process includes Degreasing, Micro etching, and Silver plating to create a thin protective layer on the circuit board surface, effectively preventing oxidation and optimizing soldering capabilities.
Bac Ninh Chemicals provides silver plating services at the most competitive prices on the market, suitable for all needs. Customers can rest assured about both quality and cost.
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Immersion Silver
Description & Features
Pure silver is an ideal material because it possesses good softness, ductility, thermal conductivity, and electrical conductivity; and it is barely reactive with water or oxygen.
These properties make silver immersion another popular surface finish in PCB manufacturing. Chemically, it creates a thin silver layer with thickness in range of 0.1~0.5µm on the copper surface to protect the copper from oxidation and improve solderability.
The silver immersion process is based on the Galvanic effect, driven by the difference in electromotive force and redox potential between copper and silver, silver ions receive electrons from copper metal while copper dissolves and silver precipitates. Specifically, a rearrangement reaction occurs between silver ions and copper atoms in solution.
Silver immersion is an environmentally friendly surface finishing and fully compliant with RoHS.
It has excellent surface flatness, suitable for high-density circuits and narrow copper pathways. Due to the surface effect, its signal attenuation in high-frequency PCB is also very low.
At the same time, it maintains the stability of silver, and it can retain good solderability even when exposed to hot and humid environments.
Without exception, it also has disadvantages. Immersion silver PCBs are sensitive to chlorine and sulfur compounds, and require more careful storage and handling than tin-immersion boards. Improper handling of Immersion silver circuit boards makes them prone to scratches.
The silver coatings will degrade over time if exposed to air for extended periods, so they should be handled within 48 hours. Meanwhile, its physical properties are not equal to ENIG due to the absence of nickel underneath.
