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A finishing coating —
is a thin protective top layer on the landing areas.
Also, the flat coating contributes to a reliable connection with the solder and the materials of the landing area when assembling the components.
Made to preserve the solderability properties of the printed circuit boards
Components/landing areas designed for surface assembly —
the characteristics of the possibility to create flatness are important.
Landing areas designed for soldering,
the main criteria for choosing the finishing coating are the characteristics of solderability/compatibility with the coating of the components leads, and the type of solder as well.
The finishing coating is applied either to the landing areas or open areas of topology.
Topologies from mechanical action (edge connectors) —
it is necessary to take into account the friction coefficient, mechanical resistance and general wearing properties.
Depending on the required protective characteristics, the nuances of use and the type of basic material, various finishing coatings are applied to the printed circuit boards. For example, to protect:
Main types of finishing coatings
HASL (HAL or POS-63) — solder coatings, made using air blade leveling technology
Lead Free HASL (LF HASL) -lead free tinning method
Based on chemical nickel (Electroless Ni)
Golding of knife plugs — soft (Gold Finger) and hard/thick (Hard Gold)
ENIG (immersion gold, ImAu) — a combination of chemical nickel and immersion gold
Immersion silver (ImAg)
Immersion tin (ImSn)
Organic coating OSP
Carbon (graphite)
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