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Cause of browning and blacking effect on aluminium sheeting?

  1. Oct 22, 2008 #1
    Hi everyone,

    Not sure if this should be here or in the chemistry section. It's a question about chemical reactions in aluminium.

    I work for a construction company and we have a number of aluminium sheets used for cladding and roofing. We've noticed that some of these have a blacking and browning effect on them. The sheets are on the outside of a building and the building itself is situated in a city centre.

    I read on this site (and somehow managed to lose the page) a question about the possibility of mercury causing such an effect, but that question hadn't been answered (and was posted in 2004). We were wondering if this could be a factor?

    Also, there is a work site near by and another thought was that it could be cementitious or limestone dust having an effect on the sheeting.

    Would anyone know what could cause such effects on alluminium? I'll try and get some photographs so that you can see what I mean. If you need any more information on it, then ask away and I'll try to give as much as I can.

    Thanks. :)
  2. jcsd
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