| Silver
electroplate can be applied utilizing either rack
fixture or barrel plating technologies. Typically a
silver-plating specification will specify a matte,
semi-bright, or bright finish with or without a
chromate post treatment to improve tarnish
resistance.
Plating
specifications also designate the base coating to be
applied under the silver plate. The thickness of
coatings can range from 1 micron for short-term
shelf life and solderability, to 10 microns for
thermo-compression bonding and die attachment, and
up to 40 microns for severe wear resistance
applications. Other factors addressed in
silver-plating specifications include the purity of
silver, hardness, conductivity and solderability
requirements and methods for testing adhesion. |
 |
Some of the more common silver-plating
specifications include ASTM B 700, QQ-S-365 &
AMS2412
Plating with Silver
provides performance, strength, and functionality.
Silver plating provides the critical benefits of
solderability and electric
conductivity for use in high tech applications.
Plus, silver plating is quiet resistant to corrosion
and does not oxidize easily, but will form a surface
tarnish of silver sulfide. Of all the metals, Silver
is the best conductor of electricity.
In electroplating, silver is primarily used for
industrial applications: electrical connectors &
contacts, batteries, medical instrument,
semiconductor, telecom, pharmaceutical & automotive
industries, jewelry and dinnerware industries.
Silver is harder than gold but softer than copper.
Pure silver, (Chemical symbol Ag) has a brilliant
white metallic luster. It is a little harder than
gold and is very ductile and malleable. Pure silver
has the highest electrical and thermal conductivity
of all metals, and possesses the lowest contact
resistance. It is stable in pure air and water, but
tarnishes when exposed to ozone, hydrogen sulfide,
or air containing sulfer. |