NASA Goddard Space Flight Center

 
Experiment #2 Photo Gallery: 

Characterize the Effectiveness of Uralane 5750 Conformal Coat Material in Prohibiting Tin Whisker Formation and/or Tin Whisker Penetration  

The following Scanning Electron Microscope (SEM) images show tin whisker growths from "bright" tin-plated brass substrates. One half of the surface of each specimen was coated with a (nominal) 2 mils (~50 microns) of Uralane 5750 conformal coat.  The other half remained uncoated.

Conformally Coated Specimens Non-Coated Specimens Area Joining Coated/Non-Coated Sides

Conformally Coated Side
Click on the Thumbnails Below to See a Larger Version of the Picture

Whiskers Growing 
THROUGH
Conformal Coat
(Estimated Thickness 0.10 to 0.25 mils)


sn5T_01_012601.jpg
sn7C_011002_01.jpg


sn5T_011002_13.jpg

Whiskers Growing 
BENEATH
Conformal Coat
(Estimated Thickness 2.0 mils)

 
sn5T_01_012601.jpg
sn5T_09_021500.jpg*
sn5T_011002_12.jpg


sn5T_011002_11.jpg*


sn5T_01_012601.jpg


sn6T_011002_04.jpg


sn6C_07_030700.jpg*


sn6C_08_030700.jpg*


sn6C_09_030700.jpg*


sn1T_07_062899.jpg


sn7C_35_012299.jpg


sn6C_10_030700.jpg*

Non-Conformally Coated Side

Filament Type Whiskers
sn6T_05_030700.jpg
sn6T_06_030700.jpg
sn5T_02_021500.jpg
Whiskers Growing from
"Surface Scratches"
sn2C_02_030700.jpg*
sn5T_10_080900.jpg
sn5T_13_012601.jpg
Whiskers Growing
from "Nodules"
sn7C_02_030700.jpg*
sn2C_06_083099.jpg
sn1C_02_083099.jpg
More Whiskers
sn5C_03_083099.jpg
sn5C_05_083099.jpg
sn5C_06_083099.jpg

sn5C_08_083099.jpg
sn5C_09_083099.jpg
sn3C_07_062599.jpg

sn6T_07_083099.jpg
sn6T_08_083099.jpg
sn5T_06_021500.jpg*

sn6C_06_030700.jpg*
sn6C_04_030700.jpg*
sn7C_14_012299.jpg
Whisker "Pyramids" 
&
"Nodules"
sn3C_03_021799.jpg
sn3C_01_021799.jpg
sn3T_19_012799.jpg*

sn3T_23_012799.jpg*
sn1T_03_052799.jpg*
sn7C_05_012799.jpg*

Area Joining Coated and Non-Coated
Miscellaneous Whiskers 
&
Nodules
Growing Along the Area Adjoining
the Coated and Non-Coated 
Portions of Each Specimen
 sn1T_06_052799.jpg*
sn2T_02_030700.jpg*
sn6T_03_083099.jpg

sn1T_09_062899.jpg*
sn1T_05_052799.jpg*
sn5T_011002_09.jpg

sn7C_06_062899.jpg
sn3T_09_012799.jpg*
sn3T_09_052799.jpg

sn3T_07_062599.jpg
sn7C_02_012799.jpg*
sn3C_07_021799.jpg

The image file name is coded as follows: sn3T_04_012700*  where,
sn3
T
04
012700
*
Test Sample Serial Number
T = Pure tin plate on brass (No Copper Flash)
C = Pure tin plate on copper flashed brass
Number Assigned to the Photograph
Month/Day/Year (Jan. 27, 2000) when photo was taken
*  Identifies specific whiskers that will be re-examined on a regular basis to determine changes
 
Responsible NASA Officials:

   Michael Sampson/NASA GSFC Code 306
   Dr. Henning Leidecker/NASA GSFC Code 562		 Additional Researchers: 

   Jong Kadesch/Orbital Sciences Corp.
   Jay Brusse/QSS Group, Inc.

Last Updated:

April 20, 2005

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