Ok to separate steel from aluminum with bronze? (Galvanic action)
If you must use an aluminum hinge with a steel pin, anodize the aluminum. Anodizing builds up a coat of very hard, non-conductive $\ce{Al2O3}$, sapphire. 

There are commercial metal fishers that will perform this, if you do not want to do so. There is a bit of an art in the process of creating a uniform coat of the required thickness: too thick and it cracks off; too thin and it wears off.