06-20-2011, 04:18 AM
There are a number of different aluminum alloys, including all of the 2000, 5000, 6000 & 7000 series, which include areonautical, marine, cast & extruded alloys, along with different heat treating & tempering. Our house is constructed with a fairly high temp, high grade structural aluminum beams (most likely 6061 T6 51). There was some galvanic corrosion, esp in high uric acid areas, but most of it cleaned off with cleaner - without pitting (a couple of areas were under high impact - wet nesting, uric acid & steel & copper contact - & did have some pitting - luckily for us, not in high structural areas.... the little wood that was in these areas was totally decayed...
Screen is an extruded grade, but is very fine & has a lot of surface area to be exposed to galvanic corrosion...so is much more apt to corrode than a structural or marine grade alloy that has a lower surface area exposed to the elements.
Screen is an extruded grade, but is very fine & has a lot of surface area to be exposed to galvanic corrosion...so is much more apt to corrode than a structural or marine grade alloy that has a lower surface area exposed to the elements.