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Many precision metal stampings
have a surface finishes applied in order to: Protect the
base material from corrosion
Aid in the surface wetting characteristics
of the device during subsequent assembly procedures
Provide
an electrically conductive pathway through the surface of
the part
Over 150 active solder/plating codes exist at Die-Tech due to
the unique requirements of each program. Rather than list all
the specific options that have worked for others, these summary
tables will help start you in the selection process to find the
correct application to fit your needs.
Solders often used to bond the precision metal stampings to
other surfaces include:
| Alloy |
Solid F |
Liquid F |
Solid 0C |
Liquid C |
| Sn62/Pb36/Ag2 |
354 |
372 |
179 |
189 |
| Sn63/Pb37 |
361 |
362 |
183 |
183 |
| Sn60/Pb40 |
361 |
374 |
183 |
193 |
| Sn90/Pb10 |
361 |
421 |
183 |
216 |
| Sn95/Pb5 |
430 |
473 |
221 |
245 |
| Sn10/Pb90 |
514 |
576 |
268 |
302 |
| Sn10/Pb88/2Ag |
514 |
570 |
268 |
299 |
The balance of the metal stamping is finished in one of two
manners:
Post-Plate - in which the surface finish
is applied after the stamping process is complete. Generally,
an electroplate
process is utilized. Stamped product will have all surfaces
coated by electrodeposits. This process increases the manufacturing
cycle and cost, however it does yield a product appropriate
for demanding applications that require all surfaces of the
part be coated.
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These plating finishes can be
applied in either bright or matte appearance to suit your
project requirements:
| Common Plating Alloys |
| Tin |
| Tin/Lead |
| Tin/Silver |
| Nickel |
| Nickel with a copper flash |
| Gold |
| Silver |
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Pre-Plate - product to which the surface
finish is applied before the stamping operation is initiated.
Stamped
product will have bare edges after the stamping process.
Whether electroplated or hot dipped processes are selected,
this process is less expensive than post-plating and has
shorter manufacturing cycles if the application can tolerate
bare edges. |
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