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<p>[QUOTE=&quot;Kasia, post: 1299944, member: 31533&quot;]from</p><p><br /></p><p><a href="http://www.onepetro.org/mslib/servlet/onepetropreview?id=NACE-03090774&amp;soc=NACE&amp;speAppNameCookie=ONEPETRO" target="_blank" class="externalLink ProxyLink" data-proxy-href="http://www.onepetro.org/mslib/servlet/onepetropreview?id=NACE-03090774&amp;soc=NACE&amp;speAppNameCookie=ONEPETRO" rel="nofollow">http://www.onepetro.org/mslib/servlet/onepetropreview?id=NACE-03090774&amp;soc=NACE&amp;speAppNameCookie=ONEPETRO</a></p><p>&quot;The effect of ultraviolet light on the corrosion rates of different metals was studied in two separate investigations. Metal samples were immersed in a flowing fresh water discharge stream for either three or five months under both ultraviolet (UV) light and dark conditions. Weight-loss results demonstrated that pure zinc, carbon steel, aluminum 6061 (UNS A96061), pure copper, and pure silver all experienced photocorrosion, that is, a greater weight loss under exposure to UV light vs in the dark&quot;</p><p><br /></p><p><br /></p><p>In the above quoted material....&quot;greater weight loss&quot; equals loss of metal.</p><p><br /></p><p><br /></p><p>Photocorrosion is simply corrosion of metal due strictly to the photo (light) source, or light spectrum, irregardless of heat or other items. UV light is not seen to the human eyes, but if you take the damage to skin (sunburn/cancer, down to the bones, at times, and eye damage from UV light), then abstract that out to encompass a harder denser material, like coins are made of, and realize that nothing is impervious to this. Most of the time things fail (metal stress, failure) due to combinations of stressors, and not just the UV, or erosion of materials happens concomittantly and erosion is blamed solely, because erosion can be &quot;seen&quot; and UV damage escapes the &quot;blame&quot;. It is hidden damage.[/QUOTE]</p><p><br /></p>

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