Screen door corroding???

Hi all, I was wondering if anybody else could help me with a question. I live in the houston area and last fall I rescreened my front storm door. I have done this a number of times before on doors and windows in different homes I have lived in from, arizona, ohio, and florida. I usually replace the original fiberglass stuff with the charcoal aluminum because I have 3 cats and the aluminum with stand up stronger to their claws if they were to get cute with the screen.
Back to the point, I have noticed the last few months at sporadic points on this front storm door that I rescreened, tiny little white spots here and there. I just assumed it was a mold kind of thing due to the temp and humidity prone to the area. I figured I would just clean it off at some point and be done with it. Well that some point came yesterday and I noticed that in all the areas the little white spots (1cm x 2cm maybe) the screen material seems to just dissolve, almost like corrosion.
I was always under the impression aluminum didn't rust, and can corrode, but I've never seen anything quite like this. Is this indeed corrosion, from what dewpoint, maybe salt from ocean air. Or maybe a secretion from bug/spider/frogs/ that could cause it to do that. I just have never seen this, and I don't really want to waste my time rescreening if this will happen again. Should I be looking at different screen material, like fiberglass or a different aluminum screening.

Thanks for any input.

 

If you are close to the ocean, bare aluminum is not a good thing to use. And yes, it is corrosion. There are coated screens, copper screen, maybe even stainless screen(probably pricey). Fiberglass may not last too long with cats, but it is easier to replace and probably cheaper.

 

Your best choice that will not corrode or tear from your cat is "Pet Screen". Pet Screen is made from vinyl coated polyester. It is much heavier than fiberglass or aluminum screening and is 7 times stronger.

 

Thanks for the replies guys, I thought that might of been corrosion but I'd be almost positive that that charcoal aluminum screen roll I bought is a vinal coated aluminum, which gives it the black appearance. Maybe just in area the vinal coating has broke down so those areas started corroding, I guess anyway.
The pet screen stuff sounds like a good product, I looked around online. Can I buy this at a brick and mortor store like home depot,lowes,petco,petsmart, or do I have to buy it through online retail only.
Thanks much

 

The only place you will probably find it is at a local glass shop or hardware store that does re-screening.