I recently came across a new website that is advocating the use of only stainless steel when purchasing your birds home. Apparently Stainless Steel Bird Cages are not only stronger and longer lasting than powder coated cages but the other types of metal are not as strong. This could be a real problem if you have a larger macaw or cockatoo who like to chew as the softer metals can actually flake off and be ingested by your bird which will eventually lead to metal toxicity poisoning.
I’m by no means an expert but what they talk about about on their site makes a lot of sense to me and is probably information we should all head.