Difference between revisions of "Photographs of corrosion and surface defects"
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− | + | 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: | |
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− | |width="515pt"|[[Image: | + | |width="515pt"|[[Image:c5_02_closeup.jpg|thumb|none|500px|figure 2a: Photograph of 5micron/Center#2 flaws taken 09/08.]] |
− | |width="515pt"|[[Image:c2_02_closeup_new.jpg|thumb|none|500px|figure | + | |width="515pt"|[[Image:c5_02_closeup_new.jpg|thumb|none|500px|figure 2b: Photograph of 5micron/Center#2 flaws taken 03/09.]] |
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+ | 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. | ||
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+ | |width="515pt"|[[Image:c2_02_closeup.jpg|thumb|none|500px|figure 4a: Photograph of 2micron/Center#2 flaws taken 09/08.]] | ||
+ | |width="515pt"|[[Image:c2_02_closeup_new.jpg|thumb|none|500px|figure 4b: Photograph of 2micron/Center#2 flaws taken 03/09.]] | ||
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− | |width="515pt"|[[Image:c2_02_closeup2.jpg|thumb|none|500px|figure | + | |width="515pt"|[[Image:c2_02_closeup2.jpg|thumb|none|500px|figure 5a: Photograph of 2micron/Center#2 flaws taken 09/08.]] |
− | |width="515pt"|[[Image:c2_02_closeup2_new.jpg|thumb|none|500px|figure | + | |width="515pt"|[[Image:c2_02_closeup2_new.jpg|thumb|none|500px|figure 5b: Photograph of 2micron/Center#2 flaws taken 03/09.]] |
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Revision as of 17:35, 27 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:
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.