Conclusion
Aluminum Door & Window Frame Profile Series
Both cast iron and wrought iron are susceptible to corrosion over time when their bare surfaces are exposed to the elements. That’s why both materials will require finishing and regular maintenance. However, cast iron generally rusts more slowly than wrought iron and thus can go longer intervals between upkeep.
Ultimately, you get what you pay for. If you’re on a tight budget and are forced to settle for less, so be it. But just know that wrought iron fences are worth their weight in gold (and they’re pretty heavy, so that’s saying something!).