Q: I’m using metric Grade 5 titanium bolts, washers and nuts for automotive application. Since the car will never be exposed to any salt water environments do I need to worry about galvanic corrosion?
A: Galvanic corrosion is really only a problem if you have a liquid medium between the fasteners to transmit the current. Furthermore, since you are using Titanium Grade 5 bolts, washers and nuts and the Titanium is the more noble material, it’s even less of a concern. This chart shows the galvanic effects between Titanium (y-axis) and alloy steel (top x-axis).