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

DISCLAIMER:
This website provides information about tin whiskers and related research. The independent research performed during the past 50+ years is so vast that it is impractical to cover all aspects of tin whiskers in this one resource. Therefore, the absence of information in this website about a particular aspect of tin whiskers should NOT be construed as evidence of absence.

COPYRIGHT NOTICE:
This material is presented to ensure timely dissemination of scholarly and technical work. For technical references posted herein, copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.

SECURITY BANNER