What is the best way to protect bare iron metal from rust? Options

[Langing]

I picked off a steering knuckle from a junkyard Celica, removed the ball joint and wheel bearing, and cleaned it with a wire wheel to the point where it seems rust and yuck free. Now it is almost all bare metal and I have two questions:

1) What is the best/easiest way to remove the remaining rust? (I don't have a sand blaster.)

2) What is a good/long-lasting way to protect the bare metal from rusting again?

To show what I am talking about I include a photo of the newly cleaned SN next to my Celica's SN (the one with with bent ears). The junkyard SN is the lighter of the two, the golden rust colored one; it came from a red 1995 Celica and is going on a white 1994 Celica:



Thanks to anyone who takes time to help me by discussing these questions.

[Box]

The last option is just to move further south.

[Langing]

The last option is just to move further south.

The changes in climate during my lifetime have already made North Carolina feel like Alabama, or upper Florida before. There are many days of the year with high relative humidity. And the number of days we pass through dew point seems to be lengthening; I dare not leave any expensive metallic tools in my shed over winter. I live far enough south to be almost free of road salt in the winter; nice snow-storms are a thing of the past. I really don't see the benefit of moving still farther south to take on even more heat and humidity. If you had suggested "out west," maybe in the desert where there isn't any wetness at all, ok.