| |
 |
Gold
|
Great
look and feel. Jewelry. Solderability and corrosion resistence.
Normally used over nickel or silver base. Improve tarnish
resistance. |
| |
|
Silver |
Excellent
conductivity. Application of light water dip lacquer or chromate
treatment per Grade A does not impair solderability. Greatly
increases conductivity of lesser metals. An attractive decorative
finish, particularly when base metal polished or satined. |
| |
|
Copper |
Stop
off for carburizing, shielding for brazing. As an undercoat
for other plating, increase electrical conductivity to prevent
base metal migration into tin (prevents poisoning solderability). |
| |
|
Chromium |
Decorative
chrome is normally applied over copper and nickel plate. Hard
chrome is plated directly to the basis metal. Parts requiring
heavy deposits should be overplated and ground to the finished
dimension. |
| |
|
Tin |
Excellent
solderability with fair corrosion resistance. Oxides on Type
I must be removed before soldering or parts must be protected
by lacquer or similar finish immediately after plating. Type
I parts may be fused but thickness will vary after treatment.
A maximum of .0002 must be maintained to permit satisfactory
fusing. This process is also available for wire and strip. |
| |
|
Nickle
|
There
is a nickle finish for almost any need. Nickle can be deposited
soft or hard, dull or bright. Corrosion resistance is related
to thickness applied. Low co-efficient or thermal expansion.
Slightly magnetic. Class I coating that include copper undercoat
are used for decorative chromium systems. |
| |
|
Electroless
Nickle |
100
percent uniformity of plate thickness on all accesible internal
and external areas. Exceptionally good for salvage purpose.
Heat treatment at 500'f for one hour, should result in coastings
with a Vickers hardness of 850 = 150 for class 2 applications. |
| |
|
Rhodium |
Excellent abrasion resistance. Good electrical concuctivity.
Hard as chromium. Will not tarnish. Excellent wear in contact
areas. |
| |
|
Zinc |
Gives
galvanic protection to base metal. Untreated (Type I) zinc
does not maintain its bright surface for a very long period
of time. Weather exposure will change zinc to a dull gray. |
