Difference between revisions of "Photographs of corrosion and surface defects"
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|width="515pt"|[[Image:r2_02_roller_marks.jpg|thumb|none|500px|figure 6a: Photograph of roller marks on 2 micron board.]] | |width="515pt"|[[Image:r2_02_roller_marks.jpg|thumb|none|500px|figure 6a: Photograph of roller marks on 2 micron board.]] | ||
|width="515pt"|[[Image:r2_02_roller_marks2.jpg|thumb|none|500px|figure 6b: Photograph of roller marks on 2 micron board]] | |width="515pt"|[[Image:r2_02_roller_marks2.jpg|thumb|none|500px|figure 6b: Photograph of roller marks on 2 micron board]] | ||
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+ | Here are some more examples of localized surface defects on the 2 micron boards: | ||
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+ | |width="515pt"|[[Image:c2_01_surface_flaw.jpg|thumb|none|500px|figure 7a: Photograph of surface defect on 2 micron center#1 board.]] | ||
+ | |width="515pt"|[[Image:c2_02_oxidation.jpg|thumb|none|500px|figure 7b: Photograph of surface defect (oxidation?) on 2 micron center#2 board]] | ||
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Revision as of 12:54, 30 March 2009
Photographs of flaws in the Allflex films were taken when the boards arrived in September '08 and again in March '09 after being stored in a dry Nitrogen environment. The first two photographs below show that there was already evidence for corrosion or poor quality of the copper surface on one of the 5 micron boards when they arrived from the manufacturer, but it is not clear that this problem became worse over time.
There are marks on one of the 5 micron center boards that from a distance look like fingerprints but actually turn out to be scuff/scratch marks:
There is evidence for degradation of 2 traces on the same 5 micron center board that I was not able to verify already existed when the board came from the manufacturer:
Below are before and after photographs for one of the central 2 micron boards. There is evidence for either oxidation of the copper or left-over photo-resist material present upon arrival of the boards from the manufacturer. Again, it does not appear that these flaws got worse over time.
Almost all of the 2 micron boards have regular marks indicating possible left-over contamination from rollers:
Here are some more examples of localized surface defects on the 2 micron boards: